坐标系的变化与图形变换.doc

坐标系的变化与图形变换
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.FillRectangle(Brushes.White, this.ClientRectangle);
g.DrawRectangle(Pens.Black, 10, 10, 50, 50);
g.DrawEllipse(Pens.Black,10,10,10,10);
g.ScaleTransform(2.0f, 3.0f);
g.DrawRectangle(Pens.Black, 10, 10, 50, 50);
g.DrawEllipse(Pens.Black, 10, 10, 10, 10);
g.ScaleTransform(0.5f, 0.3333333f);
g.DrawRectangle(Pens.Red, 20, 30, 100, 150);
g.DrawEllipse(Pens.Red, 20, 30, 20, 30);
}
private void button1_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.FillRectangle(Brushes.White, this.ClientRectangle);
Font f = new Font("Times New Roman", 24);
g.DrawString("Traslation",f,Brushes.Black,0,0);
g.TranslateTransform(150, 75);
g.DrawString("Traslation", f, Brushes.Black, 0, 0);
}

private void button2_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.FillRectangle(Brushes.White, this.ClientRectangle);
for (int i = 1; i <= 5; ++i)
{
g.DrawRectangle(Pens.Black, 10, 10, 30, 50);
g.TranslateTransform(2, 10);
}
}

private void button3_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.FillRectangle(Brushes.White, this.ClientRectangle);
g.DrawEllipse(Pens.Black, 20, 20, 30, 50);
g.TranslateTransform(-15, 0);
g.DrawEllipse(Pens.Black, 20, 20, 30, 50);
g.ResetTransform();
g.TranslateTransform(0, 30);
g.DrawEllipse(Pens.Black, 20, 20, 30, 50);
}

private void button4_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.FillRectangle(Brushes.White, this.ClientRectangle);
Font f = new Font("Times New Roman", 24);
g.DrawString("Rotation", f, Brushes.Black, 0, 0);
g.RotateTransform(45);
g.TranslateTransform(100, 10);
g.DrawString("Rotation", f, Brushes.Black, 0, 0);
}

private void button5_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.FillRectangle(Brushes.White, this.ClientRectangle);
Font f = new Font("Times New Roman", 16);
for (float angle = 0; angle < 360; angle += 45)
{
g.ResetTransform();
g.TranslateTransform(ClientRectangle.Width / 2, ClientRectangle.Height / 2);
g.RotateTransform(angle);
g.DrawString("Hello World", f, Brushes.Red, 50, 0);
}
}

private void button6_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.FillRectangle(Brushes.White, this.ClientRectangle);
Font f = new Font("Times New Roman", 24);
g.TranslateTransform(175, 50);
g.DrawString("BOBUI.DH", f, Brushes.Black, 0, 0);
g.ScaleTransform(-1, 1);
g.DrawString("BOBUI.DH", f, Brushes.Black, 0, 0);
}

private void button7_Click(object sender, EventArgs e)
{
Graphics g = this.CreateGraphics();
g.FillRectangle(Brushes.White, this.ClientRectangle);
Matrix m = new Matrix();
m.Shear(0.6f, 0);
g.DrawRectangle(Pens.Black, 10, 10, 50, 50);
g.MultiplyTransform(m);
g.DrawRectangle(Pens.Black, 70, 10, 50, 50);
}
Form1_Paint：这里里面实现了一个图形的放缩
ScaleTransform：将指定的缩放操作应用于此 Graphics 的变换矩阵，方法是将该对象的变换矩阵左乘该缩放矩阵

button1_Click：坐标系平移实现图像位置的变化
TranslateTransform：通过使此 Graphics 的变换矩阵左乘指定的平移来更改坐标系统的原点。
button2_Click：坐标原点的变换，这个例子说明TranslateTransform变换坐标是连续的
button3_Click：还原系统原点
ResetTransform：将此 Graphics 的世界变换矩阵重置为单位矩阵
button4_Click：图像的旋转
RotateTransform：指定旋转应用于此 Graphics 的变换矩阵
button5_Click：坐标系变换与旋转综合示例
button6_Click：图形的变换
ScaleTransform：指定的缩放操作应用于此 Graphics 的变换矩阵，方法是将该对象的变换矩阵左乘该缩放矩阵
button7_Click：图形的变换
MultiplyTransform：将此 Graphics 的世界变换乘以指定的 Matrix
Shear：通过预先计算切变向量将指定的切变向量应用到此 Matrix