C#GDI 繪製線段（實線或虛線）、矩形、字串、圓、橢圓

繪製基本線條和圖形 比較簡單，直接看程式碼。

 1             Graphics graphics = e.Graphics;
 2 
 3             //繪製實線
 4             using (Pen pen = new Pen(Color.Black, 2))
 5             {
 6                 pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid; //實現
 7                 graphics.DrawLine(pen,0
 
,10,100,10);
 8             }
 9 
10             //畫出虛線
11             using (Pen pen = new Pen(Color.Black, 2))
12             {
13                 pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash; //虛線
14                 graphics.DrawLine(pen, 0, 15, 100, 15);
15             }
16 
17             //
 
畫出矩形
18             using (Pen pen = new Pen(Color.Black, 2))
19             {
20                  Rectangle rectangle = new Rectangle(2,30,100,50);
21                     graphics.DrawRectangle(pen,rectangle);
22             }
23 
24             //繪製字串
25             string str = "Hello 笨男孩!";
26
 
             graphics.DrawString(str, this.Font, Brushes.Black, 2, 100);
27 
28             //測量字串的高度和寬度
29             SizeF szfTitle = graphics.MeasureString(str, this.Font);
30             graphics.DrawString(str, this.Font, Brushes.Black, 2, 200-(int)szfTitle.Height);
31             graphics.DrawString("該字串高度："+szfTitle.Height+" 字串寬度："+szfTitle.Width, this.Font, Brushes.Black, 2, 200);
32 
33 
34 
35             //繪製圓
36             using(Pen pen = new Pen(Color.Black,2))
37             {
38                 //圓
39                 graphics.DrawEllipse(pen,2,230,100,100); //在畫板上畫橢圓,起始座標為(10,10),外接矩形的寬為100,高為100   此時就是一個圓
40 
41                 //橢圓
42                 graphics.DrawEllipse(pen, 2, 400, 100, 50); //在畫板上畫橢圓,起始座標為(10,10),外接矩形的寬為100,高為50   此時就是一個橢圓
43             }

繪製效果

原始碼工程檔案下載