5、漸層色填充
需要使用兩個刷子：
線性梯度刷子(LinearGradientBrush)
路徑梯度刷子(PathGuadientBrush)
private void button4_ClickDlickD.ClickS. /繪圖表面
Graphics g =this.pictureBoxII1.CreateGraphics();
g.FillRectangle(Brushes.White,this.pictureBoxII1.ClientRectangle);
// LinearGradientBrush(
new Point(0, 10),
new Point(150, 10),
Color.FromArgb(255, 0, 0),
Color.FromArgb(255, 0, 0),
Color.FromArg5b(0,0);
Pen pen = new Pen(lgbrush);//用線性筆刷梯度效果的筆繪製一條直線段並填滿一個矩形
g.DrawLine(pen, 10, 130, 500, 130); g.FillRectangle(lgbrush, 10, 150, 370, 30);
//定義路徑並增加一個橢圓
GraphicsPath gp = new GraphicsPath();
GraphicsPath gp = new GraphicsPath();
.InterpolationColors = blend;
//在橢圓外填滿一個矩形
g.FillRectangle(brush, 0, 0, 210, 110);
//用了橢圓的刷子路徑定義第二個路徑梯度GraphicsPath gp2 = new GraphicsPath();gp2.AddEllipse(300, 0, 200, 100);PathGradientBrush brush2 = new PathGradientBrush(gp2); CenterPoint = new PointF(450, 50);brush2.CenterColor = Color.FromArgb(0, 255, 0);
//設定邊界顏色
Color[] color2 = {Color.FArgb(2555, b(2555, 25555, 2555, 25555, 25555, 25555, 25555, 25555,25555, 25555, 25555, 2555 0)};
brush2.SurroundColors = color2;
//用第二個梯度刷填滿橢圓
g.FillEllipse(brush2, 300, 0, 200, 100);的座標系統
通用座標系－使用者自訂座標系。 頁面座標系－虛擬座標系。
設備座標系－螢幕座標系。
當頁面座標系和裝置座標系的單位都是像素時，它們相同。 private void button10_Click(object sender, System.EventArgse){Graphics g = this.pictureBoxII1.CreateGraphics();g.Clear(.);
}
private void Draw(Graphics g)
g.DrawLine(Pens.Black, 10, 10, 100, 100);
g.D. 100);
)
);private void button5_Click(object sender, System.EventArgs e)
{
//左移
Graphics g = this.pictureBoxII1.CreateGraphics();
TranslateTransform(-50, 0);
this.Draw(g);
}
private void button6_Click(object sender, System.EventArgs e)
.pictureBoxII1.CreateGraphics();
g.Clear(Color.White);
g.TranslateTransform(50, 0);
this.Draw(g);
}
}＜樣
private void button8_Click(object sender, System.EventArgs e)
{
Clear(Color.White);
g.ScaleTransform(1.2f, 1.2f);
this.Draw(g);
}
private void button9_CArgidates //縮小Graphics g = this.pictureBoxII1.CreateGraphics();
g.Clear(Color.White);
g.ScaleTransform(0.8f, 0.White);
g.ScaleTransform(0.8f, 0.White); ;
}
7、全域座標－變換對於繪圖面上的每個圖元都會產生影響。通常用於設定通用座標系。 下程式將原點移至控制中心，且Y軸正向朝上。 //先畫一個圓Graphics g = e.Graphics;
g.FillRectangle(Brushes.White, this.ClientRectangle);
g.DrawEllipse(Pens.Black -100,020,02,02, 200);
//使y軸正向朝上，必須做相對於x軸鏡像//變換矩陣為[1,0,0,-1,0,0]Matrix mat = new Matrix(1, 0, 0, -1, 0, 0);g.Transform = mat;Rectangle rect = this.ClientRectangle;int w = rect.Width;
;
//以原點為中心，做一個半徑為100的圓
g.DrawEllipse(Pens.Red, -100, -100, 200, 200);
g.TranslateTransform(100, 100);g.DrawEllipse(Pens.Green, -100, -100, 200, 200);
g.ScaleTransform(2, 2);
g.DrawEllipse(Pens.Blue, -100, -100, 200, 200 );
8、局部座標系－只對某些圖形進行變換，而其它圖形元素不變。
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
//客戶區設定為白色
g.Fyect,I /y軸朝上Matrix mat = new Matrix(1, 0, 0, -1, 0, 0);g.Transform = mat;//移動座標原點到窗體中心Rectangle = this.ClientRectangle;int w = rect.Width;int h = rect.Height;g.TranslateTransform(w/2, -h/2);//在全域座標下繪製橢圓g.DrawEllipse(Pens.Red, -100, -100, 200, 200);g.FillRectangle(Brushes.Black, -108, 0, 8, 8);g.FillRect, 100, 0, 8, 8);g.FillRectangle(Brushes.Black, 0, 100, 8, 8);g.FillRectangle(Brushes.Black, 0, -108, 8, 8);
//建立一個橢圓然後在局部座標系中進行變換
GraphicsPath gp = new GraphicsPath();
gp.AddEllipse(-100, -100, 200, 200);
PointF[] p = gp.PathPoints;
g.FillRectangle(Brushes.Black, p[0].X-2, p[0].Y+2, 4, 4);
g.FillRectangle(Brushes.Black, p[3].X-2, p[3].Y+2, 4, 4);
gp. Dispose();
//base.OnPaint (e);}
9、Alpha混合
{pto建立一個填充矩形
SolidBrush brush = new SolidBrush(Color.BlueViolet);
Sol, SolidBrush(crom, SolidBrush redBrush =
);SolidBrush greenBrush =new SolidBrush(Color.FromArgb(210, 0, 255, 0));bg1.FillRectangle(redBrush, 0, m , 30, 30, 150, 70);g.DrawImage(bm1, 100, 100);//建立一個點陣圖，其中兩個位元圖之間沒有透明效果 200, 100);Graphics bg2 = Graphics.FromImage(bm2);bg2.CompositingMode = CompositingMode.資料le( greenBrush, 30, 30, 150, 70);g.CompositingQuality = CompositingQuality.GammaCorrected;g.DrawImage(bm2, 300, 200);H10、反走樣
protected override void OnPaint(PaintEventArgs e){Graphics g = e.Graphics;//放大8倍沒有反走樣的圖形和文字
Draw(g);
//設定反走樣
g.SmoothingMode = SmoothingMode.AntiAlias;
e
/右移40 ;//再繪製就是反走樣之後的了
Draw(g);
private void Draw(Graphics g)
{
private void Draw(Graphics g){🜎和文字g.DrawLine(Pens.Gray, 10, 10, 40, 20);g.DrawEllipse(Pens.Gray, 20, 20, 30, 10);樣檢定;
g.DrawString(s, font, brush, 10, 40);
