Csharp/C Sharp/2D Graphics/Gradient
Содержание
- 1 All Linear Gradient Mode
- 2 Gradient Brushes
- 3 Gradient Button
- 4 Gradient Demo
- 5 Gradient Label
- 6 Gradient Label Host
- 7 Gradient Wrap
- 8 Line Gradient
- 9 Path Gradient
- 10 Path Gradient Brush from Graphics Path
- 11 Path Gradient Demo
- 12 Simple way to create linear gradient brush
- 13 Use LinearGradientBrush to draw a Rectangle
All Linear Gradient Mode
<source lang="csharp">
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
public Form1()
{
InitializeComponent();
SetStyle(ControlStyles.ResizeRedraw, true);
}
private void InitializeComponent()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(211, 104);
this.Text = "";
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
}
static void Main()
{
Application.Run(new Form1());
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
Rectangle r = new Rectangle(10, 10, 100, 100);
LinearGradientBrush theBrush = null;
int yOffSet = 10;
Array obj = Enum.GetValues(typeof(LinearGradientMode));
for(int x = 0; x < obj.Length; x++)
{
LinearGradientMode temp = (LinearGradientMode)obj.GetValue(x);
theBrush = new LinearGradientBrush(r, Color.Red,
Color.Blue, temp);
g.DrawString(temp.ToString(), new Font("Times New Roman", 10),
new SolidBrush(Color.Black), 0, yOffSet);
g. FillRectangle(theBrush, 120, yOffSet, 200, 50);
yOffSet += 80;
}
}
}
</source>
Gradient Brushes
<source lang="csharp"> /* User Interfaces in C#: Windows Forms and Custom Controls by Matthew MacDonald Publisher: Apress ISBN: 1590590457
- /
using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Drawing.Drawing2D; namespace GDI_Basics {
/// <summary>
/// Summary description for GradientBrushes.
/// </summary>
public class GradientBrushes : System.Windows.Forms.Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ruponentModel.Container components = null;
public GradientBrushes()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
//
// GradientBrushes
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(388, 298);
this.Name = "GradientBrushes";
this.Text = "GradientBrushes";
this.Resize += new System.EventHandler(this.GradientBrushes_Resize);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.GradientBrushes_Paint);
}
#endregion
[STAThread]
static void Main()
{
Application.Run(new GradientBrushes());
}
private void GradientBrushes_Resize(object sender, System.EventArgs e)
{
this.Invalidate();
}
private void GradientBrushes_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
ArrayList stylesShown = new ArrayList();
LinearGradientBrush myBrush;
int y = 20;
int x = 20;
foreach (LinearGradientMode gradientStyle in System.Enum.GetValues(typeof(LinearGradientMode)))
{
myBrush = new LinearGradientBrush(new Rectangle(x, y, 100, 60), Color.Violet, Color.White, gradientStyle);
e.Graphics.FillRectangle(myBrush, x, y, 100, 60);
e.Graphics.DrawString(gradientStyle.ToString(), new Font("Tahoma", 8), Brushes.Black, 110 + x, y + 20);
y += 70;
}
}
}
}
</source>
Gradient Button
<source lang="csharp"> /* Code revised from chapter 5
GDI+ Custom Controls with Visual C# 2005 By Iulian Serban, Dragos Brezoi, Tiberiu Radu, Adam Ward Language English Paperback 272 pages [191mm x 235mm] Release date July 2006 ISBN 1904811604 Sample chapter http://www.packtpub.ru/files/1604_CustomControls_SampleChapter.pdf
For More info on GDI+ Custom Control with Microsoft Visual C# book visit website www.packtpub.ru
- /
using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Drawing.Drawing2D;
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private System.ruponentModel.IContainer components = null;
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.gradientButton1 = new GradientButton();
this.SuspendLayout();
//
// gradientButton1
//
this.gradientButton1.BackColor = System.Drawing.SystemColors.ControlDark;
this.gradientButton1.BorderStyle = System.Windows.Forms.Border3DStyle.Raised;
this.gradientButton1.EndColor = System.Drawing.SystemColors.ActiveCaption;
this.gradientButton1.Location = new System.Drawing.Point(91, 53);
this.gradientButton1.Name = "gradientButton1";
this.gradientButton1.Size = new System.Drawing.Size(100, 40);
this.gradientButton1.StartColor = System.Drawing.SystemColors.ControlLightLight;
this.gradientButton1.TabIndex = 0;
this.gradientButton1.Text = "Gradient Button";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Center;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.gradientButton1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
private GradientButton gradientButton1;
private void controlPart2_Click(object sender, EventArgs e)
{
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
public partial class GradientButton : BorderGradientPanel
{
public GradientButton()
{
UpdateAppearance();
InitializeComponent();
}
private bool clicked = false;
private void UpdateAppearance()
{
if (clicked)
{
StartColor = SystemColors.Control;
EndColor = SystemColors.ControlLight;
BorderStyle = Border3DStyle.Sunken;
}
else
{
StartColor = SystemColors.ControlLight;
EndColor = SystemColors.Control;
BorderStyle = Border3DStyle.Raised;
}
}
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
clicked = true;
UpdateAppearance();
}
}
protected override void OnMouseUp(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
clicked = false;
UpdateAppearance();
}
}
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
Brush foreBrush = new SolidBrush(ForeColor);
SizeF size = pe.Graphics.MeasureString(Text, Font);
PointF pt = new PointF((Width - size.Width) / 2, (Height - size.Height) / 2);
if (clicked)
{
pt.X += 2;
pt.Y += 2;
}
pe.Graphics.DrawString(Text, Font, foreBrush, pt);
foreBrush.Dispose();
}
private System.ruponentModel.IContainer components = null;
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Component Designer generated code
private void InitializeComponent()
{
components = new System.ruponentModel.Container();
//this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
}
#endregion
}
public partial class BorderGradientPanel : Control
{
private Border3DStyle borderStyle = Border3DStyle.Sunken;
private Color startColor = SystemColors.Control;
private Color endColor = SystemColors.Control;
public Color EndColor
{
get
{
return endColor;
}
set
{
if (endColor != value)
{
endColor = value;
Invalidate();
}
}
}
public Color StartColor
{
get
{
return startColor;
}
set
{
if (startColor != value)
{
startColor = value;
Invalidate();
}
}
}
public Border3DStyle BorderStyle
{
get
{
return borderStyle;
}
set
{
if (borderStyle != value)
{
borderStyle = value;
Invalidate();
}
}
}
public BorderGradientPanel()
{
SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw, true);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
LinearGradientBrush brush = new LinearGradientBrush(new Point(0, 0), new Point(0, Height), startColor, endColor);
e.Graphics.FillRectangle(brush, ClientRectangle);
ControlPaint.DrawBorder3D(e.Graphics, ClientRectangle, borderStyle);
brush.Dispose();
}
private System.ruponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Component Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
components = new System.ruponentModel.Container();
//this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
}
#endregion
}
public class ScrollArrowButton : ControlPart
{
protected override void RenderControl(Graphics g, ButtonState buttonState, CheckState checkState)
{
//ControlPaint.DrawScrollButton(g, ClientRectangle, ScrollButton.Up,buttonState);
ControlPaint.DrawScrollButton(g, ClientRectangle, sButton, buttonState);
}
private ScrollButton sButton = ScrollButton.Up;
public ScrollButton ButtonType
{
get
{
return sButton;
}
set
{
if (sButton != value)
{
sButton = value;
Invalidate();
}
}
}
}
public class CheckButton : ControlPart
{
protected override void RenderControl(Graphics g, ButtonState buttonState, CheckState checkState)
{
ButtonState bstate = buttonState;
switch (checkState)
{
case CheckState.Checked: bstate = ButtonState.Checked; break;
case CheckState.Indeterminate: bstate = ButtonState.All; break;
}
ControlPaint.DrawCheckBox(g, ClientRectangle, bstate);
}
}
public class ControlPart : Control
{
private ButtonState buttonState = ButtonState.Flat;
private CheckState checkState = CheckState.Unchecked;
//indicates wheter the mouse is hovering over the control
protected bool mouseOver = false;
public ControlPart()
{
SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw, true);
}
protected override void OnMouseEnter(EventArgs e)
{
base.OnMouseEnter(e);
buttonState = ButtonState.Normal;
mouseOver = true;
Invalidate(true);
}
protected override void OnMouseLeave(EventArgs e)
{
base.OnMouseLeave(e);
buttonState = ButtonState.Flat;
mouseOver = false;
Invalidate(true);
}
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
this.Focus();
if (!(e.Button == MouseButtons.Left)) return;
buttonState = ButtonState.Pushed;
switch (checkState)
{
case CheckState.Checked: checkState = CheckState.Unchecked; break;
case CheckState.Unchecked: checkState = CheckState.Checked; break;
case CheckState.Indeterminate: checkState = CheckState.Unchecked; break;
}
Invalidate(true);
}
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
if (!((e.Button & MouseButtons.Left) == MouseButtons.Left)) return;
buttonState = ButtonState.Normal;
Invalidate(true);
}
protected virtual void RenderControl(Graphics g, ButtonState buttonState, CheckState checkState)
{
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
RenderControl(e.Graphics, buttonState, checkState);
}
}
</source>
Gradient Demo
<source lang="csharp"> /* GDI+ Programming in C# and VB .NET by Nick Symmonds Publisher: Apress ISBN: 159059035X
- /
using System; using System.Drawing; using System.Drawing.Imaging; using System.Drawing.Drawing2D; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; namespace GradientBlend_c {
/// <summary>
/// Summary description for GradientBlend.
/// </summary>
public class GradientBlend : System.Windows.Forms.Form
{
private System.Windows.Forms.HScrollBar BlendWidth;
private System.ruponentModel.Container components = null;
private System.Windows.Forms.HScrollBar Skew;
private System.Windows.Forms.Button cmdDoubleBuffer;
private int BlWidth;
private int SkewVal;
private Rectangle EL1Rect;
private Rectangle EL2Rect;
private Region EL1Region;
private Region EL2Region;
private Region EL3Region;
public GradientBlend()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//Set up rectangles to draw ellipses in
EL1Rect = new Rectangle(10, 10, 150, 50);
EL2Rect = EL1Rect;
//I could make a new rectangle but I can offset without knowing
//anything about the previous rectangle.
EL2Rect.Offset(200, 0);
//Set up Regions for invalidation
EL1Region = new Region(EL1Rect);
EL2Region = new Region(EL2Rect);
EL3Region = new Region( new Rectangle(new Point(0, 65),
new Size(this.Width, 50)));
//Set up the blend scroll bar
BlendWidth.Top = 120;
BlendWidth.Left = this.Width/3;
BlendWidth.Width = this.Width/3;
BlendWidth.Minimum = 10;
BlendWidth.Maximum = 200;
BlendWidth.SmallChange = 1;
BlendWidth.LargeChange = 10;
BlendWidth.Value = BlendWidth.Minimum;
//Set up the Skew Scroll Bar
Skew.Top = 145;
Skew.Left = this.Width/3;
Skew.Width = this.Width/3;
Skew.Minimum = 10;
Skew.Maximum = 40;
Skew.SmallChange = 1;
Skew.LargeChange = 10;
Skew.Value = Skew.Minimum;
//Set up the double buffer button
cmdDoubleBuffer.Top = Skew.Top + Skew.Height + 5;
cmdDoubleBuffer.Width = Skew.Width;
cmdDoubleBuffer.Left = Skew.Left;
cmdDoubleBuffer.Text = "Allow Flicker";
BlWidth = BlendWidth.Value;
SkewVal = Skew.Value;
// Set up for double buffering.
//This, along with invalidating only those areas that need it TOTALY
//eliminate flicker in this program
this.SetStyle ( ControlStyles.AllPaintingInWmPaint, true);
this.SetStyle ( ControlStyles.DoubleBuffer, true);
this.SetStyle ( ControlStyles.UserPaint, true);
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
//Dispose of our own objects
EL1Region.Dispose();
EL2Region.Dispose();
EL3Region.Dispose();
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.BlendWidth = new System.Windows.Forms.HScrollBar();
this.Skew = new System.Windows.Forms.HScrollBar();
this.cmdDoubleBuffer = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// BlendWidth
//
this.BlendWidth.Location = new System.Drawing.Point(32, 224);
this.BlendWidth.Name = "BlendWidth";
this.BlendWidth.Size = new System.Drawing.Size(192, 16);
this.BlendWidth.TabIndex = 0;
this.BlendWidth.Scroll += new System.Windows.Forms.ScrollEventHandler(this.BlendChange);
//
// Skew
//
this.Skew.Location = new System.Drawing.Point(192, 272);
this.Skew.Name = "Skew";
this.Skew.Size = new System.Drawing.Size(104, 16);
this.Skew.TabIndex = 1;
this.Skew.Scroll += new System.Windows.Forms.ScrollEventHandler(this.SkewColor);
//
// cmdDoubleBuffer
//
this.cmdDoubleBuffer.Location = new System.Drawing.Point(40, 304);
this.cmdDoubleBuffer.Name = "cmdDoubleBuffer";
this.cmdDoubleBuffer.Size = new System.Drawing.Size(248, 24);
this.cmdDoubleBuffer.TabIndex = 2;
this.cmdDoubleBuffer.Text = "button1";
this.cmdDoubleBuffer.Click += new System.EventHandler(this.cmdDoubleBuffer_Click);
//
// GradientBlend
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(392, 373);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.cmdDoubleBuffer,
this.Skew,
this.BlendWidth});
this.Name = "GradientBlend";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "GradientBlend";
this.Load += new System.EventHandler(this.GradientBlend_Load);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new GradientBlend());
}
private void GradientBlend_Load(object sender, System.EventArgs e)
{
}
protected override void OnPaint ( PaintEventArgs e )
{
e.Graphics.SmoothingMode=SmoothingMode.AntiAlias;
StandardGradient( e.Graphics );
e.Graphics.DrawLine(Pens.Black, 0, cmdDoubleBuffer.Bottom+10, this.Width,
cmdDoubleBuffer.Bottom+10);
InterpolateGradient( e.Graphics );
base.OnPaint(e);
}
private void StandardGradient( Graphics G )
{
//This brush defines how the color is distributed across the whole
//graphics container. Any filled object that gets drawn in the container
//will pick up the color starting with the color gradient at that
//particular point on the screen.
LinearGradientBrush B = new LinearGradientBrush(new PointF(0, 20),
new PointF(BlWidth, SkewVal),
Color.Blue,
Color.Red);
//Draw an image inside the second rectangle
G.DrawImage(Image.FromFile("Colorbars.jpg"), EL2Rect);
//Draw a line across the screen with the brush
//to show the repeating pattern
Pen P = new Pen(B, 15);
G.DrawLine ( P, 0, 75, this.Width, 75 );
//Draw a filled ellipse to show how the colors are used
G.FillEllipse(B, EL1Rect);
//Change the starting and ending colors
//Set the alpha so the image below shows through
Color[] c = {Color.FromArgb(100, Color.LightBlue),
Color.FromArgb(100, Color.DarkBlue)};
B.LinearColors = c;
P.Brush = B;
G.DrawLine ( P, 0, 100, this.Width, 100 );
G.FillEllipse(B, EL2Rect );
//Reclaim some memory
c = null;
P.Dispose();
B.Dispose();
}
private void InterpolateGradient ( Graphics G )
{
//Make a set of colors to use in the blend
Color[] EndColors = {Color.Green,
Color.Yellow,
Color.Yellow,
Color.Blue,
Color.Red,
Color.Red};
//These are the positions of the colors along the Gradient line
float[] ColorPositions = {0.0f, .20f, .40f, .60f, .80f, 1.0f};
//Fill the blend object with the colors and their positions
ColorBlend C_Blend = new ColorBlend();
C_Blend.Colors = EndColors;
C_Blend.Positions = ColorPositions;
//Make the linear brush and assign the custom blend to it
LinearGradientBrush B = new LinearGradientBrush ( new Point(10, 110),
new Point(140, 110),
Color.White,
Color.Black );
B.InterpolationColors = C_Blend;
//Make a graphics path that we can fill and show custom blended fill
GraphicsPath Pth = new GraphicsPath();
Pth.AddEllipse(20, 210, 120, 50);
Pth.AddString("Filled String", new FontFamily("Impact"),
(int)FontStyle.Italic, 30, new Point(200, 220),
StringFormat.GenericDefault );
G.FillPath(B, Pth);
Pen P = new Pen(B, 20);
G.DrawLine ( P, 0, 300, this.Width, 300 );
if (P != null)
P.Dispose();
if (B != null)
B.Dispose();
if (Pth != null)
Pth.Dispose();
}
private void BlendChange(object sender,
System.Windows.Forms.ScrollEventArgs e)
{
BlWidth = BlendWidth.Value;
//Redraw the first ellipse
this.Invalidate(EL1Region);
//Redraw the second ellipse
this.Invalidate(EL2Region);
//Redraw the lines
this.Invalidate(EL3Region);
}
private void SkewColor(object sender,
System.Windows.Forms.ScrollEventArgs e)
{
SkewVal = Skew.Value;
//Redraw the first ellipse
this.Invalidate(EL1Region);
//Redraw the second ellipse
this.Invalidate(EL2Region);
//Redraw the lines
Invalidate(EL3Region);
}
private void cmdDoubleBuffer_Click(object sender, System.EventArgs e)
{
if ( this.GetStyle( ControlStyles.AllPaintingInWmPaint ) &&
this.GetStyle( ControlStyles.DoubleBuffer ) &&
this.GetStyle( ControlStyles.UserPaint ) )
{
cmdDoubleBuffer.Text = "Eliminate Flicker";
this.SetStyle ( ControlStyles.AllPaintingInWmPaint, false);
this.SetStyle ( ControlStyles.DoubleBuffer, false);
}
else
{
cmdDoubleBuffer.Text = "Allow Flicker";
this.SetStyle ( ControlStyles.AllPaintingInWmPaint, true);
this.SetStyle ( ControlStyles.DoubleBuffer, true);
}
}
}
}
</source>
<A href="http://www.nfex.ru/Code/CSharpDownload/GradientBlend-c.zip">GradientBlend-c.zip( 7 k)</a>
Gradient Label
<source lang="csharp"> /* Code revised from chapter 3
GDI+ Custom Controls with Visual C# 2005 By Iulian Serban, Dragos Brezoi, Tiberiu Radu, Adam Ward Language English Paperback 272 pages [191mm x 235mm] Release date July 2006 ISBN 1904811604 Sample chapter http://www.packtpub.ru/files/1604_CustomControls_SampleChapter.pdf
For More info on GDI+ Custom Control with Microsoft Visual C# book visit website www.packtpub.ru
- /
using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Drawing.Drawing2D; namespace GradientLabelTest00 {
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private System.ruponentModel.IContainer components = null;
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.gradientLabel1 = new GradientLabelTest00.GradientLabel();
this.SuspendLayout();
this.gradientLabel1.BackColor = System.Drawing.SystemColors.ControlLight;
this.gradientLabel1.BackColor2 = System.Drawing.SystemColors.ControlDarkDark;
this.gradientLabel1.ForeColor = System.Drawing.SystemColors.ActiveCaption;
this.gradientLabel1.Location = new System.Drawing.Point(66, 68);
this.gradientLabel1.Name = "gradientLabel1";
this.gradientLabel1.Size = new System.Drawing.Size(150, 47);
this.gradientLabel1.TabIndex = 0;
this.gradientLabel1.Text = "Gradient Label";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.gradientLabel1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
private GradientLabel gradientLabel1;
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
public partial class GradientLabel : Control
{
private Color backColor2 = SystemColors.ControlLight;
public GradientLabel()
{
InitializeComponent();
}
public Color BackColor2
{
get
{
return backColor2;
}
set
{
if (backColor2 != value)
{
backColor2 = value;
Invalidate();
}
}
}
private void GradientLabel_Paint(object sender, PaintEventArgs e)
{
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
LinearGradientBrush brush = new LinearGradientBrush(new Point(0, 0), new Point(0, Height), BackColor, BackColor2);
e.Graphics.FillRectangle(brush, ClientRectangle);
Brush foreBrush = new SolidBrush(ForeColor);
SizeF textSize = e.Graphics.MeasureString(Text, Font);
e.Graphics.DrawString(Text, Font, foreBrush, (Width - textSize.Width) / 2, (Height - textSize.Height) / 2);
brush.Dispose();
foreBrush.Dispose();
}
private System.ruponentModel.IContainer components = null;
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Component Designer generated code
private void InitializeComponent()
{
this.SuspendLayout();
this.BackColor = System.Drawing.SystemColors.ControlDarkDark;
this.ForeColor = System.Drawing.SystemColors.HotTrack;
this.Size = new System.Drawing.Size(150, 24);
this.Text = "Gradient Label";
this.Paint += new System.Windows.Forms.PaintEventHandler(this.GradientLabel_Paint);
this.ResumeLayout(false);
}
#endregion
}
}
</source>
Gradient Label Host
<source lang="csharp"> /* User Interfaces in C#: Windows Forms and Custom Controls by Matthew MacDonald Publisher: Apress ISBN: 1590590457
- /
using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Design; using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; namespace GradientLabelHost {
/// <summary>
/// Summary description for GradientLabelHost.
/// </summary>
public class GradientLabelHost : System.Windows.Forms.Form
{
private GradientLabel gradientLabel1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ruponentModel.Container components = null;
public GradientLabelHost()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.gradientLabel1 = new GradientLabel();
this.SuspendLayout();
//
// gradientLabel1
//
this.gradientLabel1.Dock = System.Windows.Forms.DockStyle.Fill;
this.gradientLabel1.Font = new System.Drawing.Font("Tahoma", 36F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.gradientLabel1.ForeColor = System.Drawing.Color.White;
this.gradientLabel1.GradientFill.ColorA = System.Drawing.SystemColors.Info;
this.gradientLabel1.GradientFill.ColorB = System.Drawing.Color.DarkViolet;
this.gradientLabel1.GradientFill.GradientFillStyle = System.Drawing.Drawing2D.LinearGradientMode.BackwardDiagonal;
this.gradientLabel1.Name = "gradientLabel1";
this.gradientLabel1.Size = new System.Drawing.Size(596, 118);
this.gradientLabel1.TabIndex = 0;
this.gradientLabel1.Text = "Gradient Label Test";
//
// GradientLabelHost
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(596, 118);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.gradientLabel1});
this.Name = "GradientLabelHost";
this.Text = "GradientLabelHost";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new GradientLabelHost());
}
}
/// <summary>
/// Summary description for GradientLabel.
/// </summary>
public class GradientLabel : System.Windows.Forms.UserControl
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ruponentModel.Container components = null;
public GradientLabel()
{
// This call is required by the Windows.Forms Form Designer.
InitializeComponent();
// TODO: Add any initialization after the InitForm call
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Component Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
//
// GradientLabel
//
this.Name = "GradientLabel";
this.Size = new System.Drawing.Size(372, 128);
this.Load += new System.EventHandler(this.GradientLabel_Load);
gradient.GradientChanged += new EventHandler(GradientChanged);
}
#endregion
private string text;
private GradientFill gradient = new GradientFill();
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public GradientFill GradientFill
{
get
{
return gradient;
}
set
{
gradient = value;
gradient.GradientChanged += new EventHandler(GradientChanged);
this.Invalidate();
}
}
private void GradientLabel_Load(object sender, System.EventArgs e)
{
this.ResizeRedraw=true;
}
[Browsable(true),
DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
public override string Text
{
get
{
return text;
}
set
{
text = value;
this.Invalidate();
}
}
protected override void OnPaintBackground(
System.Windows.Forms.PaintEventArgs e)
{
LinearGradientBrush brush = new LinearGradientBrush(e.ClipRectangle, gradient.ColorA,
gradient.ColorB, gradient.GradientFillStyle);
// Draw the gradient background.
e.Graphics.FillRectangle(brush, e.ClipRectangle);
}
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
base.OnPaint(e);
// Draw the label text.
e.Graphics.DrawString(text, this.Font, new SolidBrush(this.ForeColor), 0, 0);
}
private void GradientChanged(object sender, EventArgs e)
{
this.Invalidate();
}
}
[TypeConverter(typeof(ExpandableObjectConverter)),
Editor(typeof(GradientFillEditor), typeof(UITypeEditor))]
public class GradientFill
{
private Color colorA = Color.LightBlue;
private Color colorB = Color.Purple;
private LinearGradientMode gradientStyle= LinearGradientMode.ForwardDiagonal;
public event EventHandler GradientChanged;
public Color ColorA
{
get
{
return colorA;
}
set
{
colorA = value;
OnGradientChanged(new EventArgs());
}
}
public Color ColorB
{
get
{
return colorB;
}
set
{
colorB = value;
OnGradientChanged(new EventArgs());
}
}
[System.ruponentModel.RefreshProperties(RefreshProperties.Repaint)]
public LinearGradientMode GradientFillStyle
{
get
{
return gradientStyle;
}
set
{
gradientStyle = value;
OnGradientChanged(new EventArgs());
}
}
private void OnGradientChanged(EventArgs e)
{
if (GradientChanged != null)
{
GradientChanged(this, e);
}
}
}
public class GradientFillEditor : UITypeEditor
{
public override bool GetPaintValueSupported(
System.ruponentModel.ITypeDescriptorContext context)
{
return true;
}
public override void PaintValue(
System.Drawing.Design.PaintValueEventArgs e)
{
GradientFill fill = (GradientFill)e.Value;
LinearGradientBrush brush = new LinearGradientBrush(e.Bounds,
fill.ColorA, fill.ColorB, fill.GradientFillStyle);
// Paint the thumbnail.
e.Graphics.FillRectangle(brush, e.Bounds);
}
}
}
</source>
Gradient Wrap
<source lang="csharp"> /* GDI+ Programming in C# and VB .NET by Nick Symmonds Publisher: Apress ISBN: 159059035X
- /
using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; namespace GradientWrap_c {
/// <summary>
/// Summary description for GradientWrap.
/// </summary>
public class GradientWrap : System.Windows.Forms.Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ruponentModel.Container components = null;
public GradientWrap()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
//
// GradientWrap
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Name = "GradientWrap";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "GradientWrap";
this.Load += new System.EventHandler(this.GradientWrap_Load);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new GradientWrap());
}
private void GradientWrap_Load(object sender, System.EventArgs e)
{
}
protected override void OnPaint( PaintEventArgs e )
{
GraphicsPath Path = new GraphicsPath();
Rectangle R = new Rectangle(10, 10, 50, 50);
e.Graphics.DrawRectangle(Pens.Black,R);
Path.AddRectangle(R);
// PathGradientBrush B = new PathGradientBrush(Path.PathPoints);
PathGradientBrush B = new PathGradientBrush(Path.PathPoints,
WrapMode.Tile);
Color[] c = { Color.Blue, Color.Aqua, Color.Red };
B.CenterColor = Color.White;
B.SurroundColors = c;
//Small circle inside gradient path
e.Graphics.FillEllipse(B, 15, 15, 30, 30);
//Large circle outside gradient path
e.Graphics.FillEllipse(B, 50, 50, 150, 150);
}
}
}
</source>
Line Gradient
<source lang="csharp"> /* Professional Windows GUI Programming Using C# by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury,
Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information ISBN: 1861007663
- /
using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Drawing2D; // LinearGradientBrush namespace LinGradient {
/// <summary>
/// Summary description for LinGradient.
/// </summary>
public class LinGradient : System.Windows.Forms.Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ruponentModel.Container components = null;
public LinGradient()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
this.Text = "LinearGradientMode";
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
//
// LinGradient
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(256, 205);
this.Name = "LinGradient";
this.Text = "LinGradient";
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new LinGradient());
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
Font f = new Font(new FontFamily("Times New Roman"), 10);
Brush fb = new SolidBrush(Color.Black);
LinearGradientBrush lGB; // namespace System.Drawing.Drawing2D;
Color cR = Color.Red, cW = Color.White;
int w = 100, h = 70;
// Left upper rectangle:
g.DrawString("Horizontal", f, fb, 10, 5);
Rectangle rec = new Rectangle(10, 20, w, h);
LinearGradientMode lGM = LinearGradientMode.Horizontal;
lGB = new LinearGradientBrush(rec, cR, cW, lGM);
g.FillRectangle(lGB, rec);
// Right upper rectangle:
g.DrawString("Vertical", f, fb, w + 20, 5);
rec.Offset(w + 10, 0);
lGM = LinearGradientMode.Vertical;
lGB = new LinearGradientBrush(rec, cR, cW, lGM);
g.FillRectangle(lGB, rec);
// Left down rectangle:
g.DrawString("ForwardDiagonal", f, fb, 10, h + 25);
rec.Offset(-w - 10, h + 20);
lGM = LinearGradientMode.ForwardDiagonal;
lGB = new LinearGradientBrush(rec, cR, cW, lGM);
g.FillRectangle(lGB, rec);
// Right down rectangle:
g.DrawString("BackwardDiagonal", f, fb, w + 20, h + 25);
rec.Offset(w + 10, 0);
lGM = LinearGradientMode.BackwardDiagonal;
lGB = new LinearGradientBrush(rec, cR, cW, lGM);
g.FillRectangle(lGB, rec);
fb.Dispose();
g.Dispose();
}
}
}
</source>
Path Gradient
<source lang="csharp"> /* Professional Windows GUI Programming Using C# by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury,
Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information ISBN: 1861007663
- /
using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Drawing2D; // PathGradientBrush namespace PathGradient {
/// <summary>
/// Summary description for PathGradient.
/// </summary>
public class PathGradient : System.Windows.Forms.Form
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ruponentModel.Container components = null;
public PathGradient()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
this.Text = "PathGradient - CenterPoint";
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
//
// PathGradient
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(256, 213);
this.Name = "PathGradient";
this.Text = "PathGradient";
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new PathGradient());
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
Font f = new Font(new FontFamily("Times New Roman"), 10);
Brush fb = new SolidBrush(Color.Black);
GraphicsPath gp;
PathGradientBrush pGB; // namespace System.Drawing.Drawing2D;
Rectangle rec;
Color cR = Color.Red, cW = Color.White, cY = Color.Yellow;
int w = 100, h = 70;
// Left upper rectangle:
g.DrawString("Center", f, fb, 10, 5);
gp = new GraphicsPath();
rec = new Rectangle(10, 20, w, h);
gp.AddRectangle(rec);
pGB = new PathGradientBrush(gp);
pGB.CenterPoint = new Point(10 + w/2, 20 + h/2);
pGB.CenterColor = cR;
pGB.SurroundColors = new Color[1]{cW};
g.FillRectangle(pGB, rec);
// Right upper rectangle:
g.DrawString("Center - 2 x 2 Colors", f, fb, w + 20, 5);
gp = new GraphicsPath();
rec = new Rectangle(20 + w, 20, w, h);
gp.AddRectangle(rec);
pGB = new PathGradientBrush(gp);
pGB.CenterPoint = new Point(w + 20 + w/2, 20 + h/2);
pGB.CenterColor = cR;
pGB.SurroundColors = new Color[4]{cW, cY, cW, cY};
g.FillRectangle(pGB, rec);
// Left down rectangle:
g.DrawString("LefTopCenter", f, fb, 10, h + 25);
gp = new GraphicsPath();
rec = new Rectangle(10, h + 40, w, h);
gp.AddRectangle(rec);
pGB = new PathGradientBrush(gp);
pGB.CenterPoint = new Point(10, h + 40);
pGB.CenterColor = cR;
pGB.SurroundColors = new Color[1]{cW};
g.FillRectangle(pGB, rec);
// Ellipse
g.DrawString("Top", f, fb, w + 20, h + 25);
gp = new GraphicsPath();
rec = new Rectangle(w + 20, h + 40, w, h);
gp.AddEllipse(rec);
pGB = new PathGradientBrush(gp);
pGB.CenterPoint = new Point(w + 20 + w/2, h + 40);
pGB.CenterColor = cR;
pGB.SurroundColors = new Color[1]{cW};
g.FillRectangle(pGB, rec);
g.Dispose();
fb.Dispose();
}
}
}
</source>
Path Gradient Brush from Graphics Path
<source lang="csharp">
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Text = "Pen Cap App";
this.Resize += new System.EventHandler(this.Form1_Resize);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
}
static void Main()
{
Application.Run(new Form1());
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
GraphicsPath gp = new GraphicsPath();
gp.AddLine(10, 10, 110, 15);
gp.AddLine(110, 15, 100, 95);
gp.AddLine(100, 95, 15, 110);
gp.CloseFigure();
g.FillRectangle(Brushes.White, this.ClientRectangle);
g.SmoothingMode = SmoothingMode.AntiAlias;
PathGradientBrush pgb = new PathGradientBrush(gp);
pgb.CenterColor = Color.White;
pgb.SurroundColors = new Color[] { Color.Red };
g.FillPath(pgb, gp);
g.DrawPath(Pens.Black, gp);
pgb.Dispose();
gp.Dispose();
}
private void Form1_Resize(object sender, System.EventArgs e)
{
Invalidate();
}
}
</source>
Path Gradient Demo
<source lang="csharp"> using System; using System.Collections.Generic; using System.ruponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Drawing.Drawing2D; public class Form1 : Form {
public Form1() {
InitializeComponent();
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
GraphicsPath path = new GraphicsPath();
int size = 150;
path.AddEllipse(10, 10, size, size);
PathGradientBrush brush = new PathGradientBrush(path);
brush.WrapMode = WrapMode.Tile;
brush.SurroundColors = new Color[] { Color.White };
brush.CenterColor = Color.Violet;
e.Graphics.FillRectangle(brush, 10, 10, size, size);
path.Dispose();
brush.Dispose();
}
private void InitializeComponent()
{
this.SuspendLayout();
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Name = "Form1";
this.Text = "Alpha Blending";
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}
</source>
Simple way to create linear gradient brush
<source lang="csharp">
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class Form1 : System.Windows.Forms.Form
{
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Text = "Pen Cap App";
this.Resize += new System.EventHandler(this.Form1_Resize);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
}
static void Main()
{
Application.Run(new Form1());
}
private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
LinearGradientBrush lgb = new LinearGradientBrush(
new Point(0, 0),
new Point(25, 10),
Color.White,
Color.Black);
g.FillRectangle(lgb, this.ClientRectangle);
lgb.Dispose();
}
private void Form1_Resize(object sender, System.EventArgs e)
{
Invalidate();
}
}
</source>
Use LinearGradientBrush to draw a Rectangle
<source lang="csharp"> using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Drawing2D; public class Form1 : System.Windows.Forms.Form{
private System.ruponentModel.Container components = null;
public Form1(){
InitializeComponent();
SetStyle(ControlStyles.Opaque, true);
}
protected override void Dispose( bool disposing ){
if( disposing ){
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
protected override void OnPaint(PaintEventArgs e) {
Graphics g = e.Graphics;
g.FillRectangle(Brushes.White, ClientRectangle);
Brush linearGradientBrush = new LinearGradientBrush(
new Rectangle(10, 60, 50, 50), Color.Blue, Color.White, 45);
g.FillRectangle(linearGradientBrush, new Rectangle(10, 60, 50, 50));
linearGradientBrush.Dispose();
}
private void InitializeComponent(){
this.ruponents = new System.ruponentModel.Container();
this.Size = new System.Drawing.Size(300,300);
this.Text = "Form1";
}
static void Main() {
Application.Run(new Form1());
}
}
</source>
