Matrix Draw
/*
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.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace MatrixDraw_c
{
public class MatrixDraw : System.Windows.Forms.Form
{
internal System.Windows.Forms.HScrollBar rotate;
internal System.Windows.Forms.VScrollBar xlate;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
int XlateY;
float Angle;
Rectangle DrawingRect = new Rectangle(25, 25, 225, 225);
public MatrixDraw()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
Angle = 0;
XlateY = 0;
xlate.Minimum = -50;
xlate.Maximum = 50;
xlate.SmallChange = 1;
xlate.LargeChange = 5;
xlate.Value = 0;
rotate.Minimum = -180;
rotate.Maximum = 180;
rotate.SmallChange = 1;
rotate.LargeChange = 10;
rotate.Value = 0;
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();
}
}
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.rotate = new System.Windows.Forms.HScrollBar();
this.xlate = new System.Windows.Forms.VScrollBar();
this.SuspendLayout();
//
// rotate
//
this.rotate.Location = new System.Drawing.Point(8, 240);
this.rotate.Name = "rotate";
this.rotate.Size = new System.Drawing.Size(240, 16);
this.rotate.TabIndex = 3;
this.rotate.Scroll += new System.Windows.Forms.ScrollEventHandler(this.rotate_Scroll);
//
// xlate
//
this.xlate.Location = new System.Drawing.Point(264, 32);
this.xlate.Name = "xlate";
this.xlate.Size = new System.Drawing.Size(16, 200);
this.xlate.TabIndex = 2;
this.xlate.Scroll += new System.Windows.Forms.ScrollEventHandler(this.xlate_Scroll);
//
// MatrixDraw
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.rotate,
this.xlate});
this.MaximizeBox = false;
this.MinimizeBox = false;
this.Name = "MatrixDraw";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "MatrixDraw";
this.Load += new System.EventHandler(this.MatrixDraw_Load);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new MatrixDraw());
}
private void MatrixDraw_Load(object sender, System.EventArgs e)
{
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics G = e.Graphics;
G.SmoothingMode = SmoothingMode.AntiAlias;
// Create a graphics path, add a rectangle, set colors
GraphicsPath Path = new GraphicsPath();
Path.AddRectangle(new Rectangle(75, 100, 100, 75));
PointF[] Pts = Path.PathPoints;
PathGradientBrush B = new PathGradientBrush(Pts);
B.CenterColor = Color.Aqua;
Color[] SColor = {Color.Blue};
B.SurroundColors = SColor;
//We will translate the brush! NOT the rectangle!
Matrix m = new Matrix();
m.Translate(0, XlateY, MatrixOrder.Append);
m.RotateAt(Angle, B.CenterPoint, MatrixOrder.Append);
B.MultiplyTransform(m, MatrixOrder.Append);
G.FillRectangle(B, DrawingRect);
base.OnPaint(e);
m.Dispose();
B.Dispose();
Path.Dispose();
}
private void xlate_Scroll(object sender,
System.Windows.Forms.ScrollEventArgs e)
{
XlateY = xlate.Value;
this.Invalidate(DrawingRect);
}
private void rotate_Scroll(object sender,
System.Windows.Forms.ScrollEventArgs e)
{
Angle = rotate.Value;
this.Invalidate(DrawingRect);
}
}
}
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