在C＃win中創建維恩圖表格

Question

我需要以C＃格式創建維恩圖表。我一直在嘗試使用Graphics.DrawEllipse和FillElipse。但我不確定我如何填寫常見部分。

我要做到這一點，

這裏是我的這段代碼，

private void panelControlVennDiagram_Paint(object sender, PaintEventArgs e) 
{ 
    Brush brushLeft = new SolidBrush(Color.Blue); 
    Brush brushRight = new SolidBrush(Color.LightPink); 
    Brush brushCommon = new SolidBrush(Color.Purple); 

    Pen pen = new Pen(brushLeft, 10); 

    Rectangle leftVenn = new Rectangle(20, 50,100,100); 
    Rectangle rightVenn = new Rectangle(90, 50, 100, 100); 
    Rectangle commonVenn = new Rectangle(100, 120, 100, 100); 

    Font stringFont = new Font("Times New Roman", 9); 

    e.Graphics.DrawString("Left:" + leftValue, stringFont, brushLeft, 10,70); 
    e.Graphics.DrawString("Right:" + rightValue, stringFont, brushRight, 90,70); 
    e.Graphics.DrawString("Common:" + commonValue,stringFont, brushCommon, 100,70); 

    // Fill ellipse on screen. 
    e.Graphics.FillEllipse(brushLeft, leftVenn); 
    e.Graphics.FillEllipse(brushRight, rightVenn); 

    e.Graphics.DrawEllipse(Pens.White, leftVenn); 
    e.Graphics.DrawEllipse(Pens.White, rightVenn); 

}

我繪製兩個橢圓，需要有不同的顏色爲通用部分。我無法使用任何圖書館。請幫忙。

Answer 1

您可以添加System.Drawing.Drawing2D;命名空間使用GraphicPath。創建一個圖形路徑並獲取相交區域。

試試這個代碼：（我曾評論DrawString用於測試目的）

private void panelControlVennDiagram_Paint(object sender, PaintEventArgs e) 
{ 
    Rectangle leftVenn = new Rectangle(20, 50, 100, 100); 
    Rectangle rightVenn = new Rectangle(90, 50, 100, 100);   
    Region region1 = new Region(); 

    //Font stringFont = new Font("Times New Roman", 9); 
    //e.Graphics.DrawString("Left:" , stringFont, brushLeft, 10, 70); 
    //e.Graphics.DrawString("Right:" , stringFont, brushRight, 90, 70); 
    //e.Graphics.DrawString("Common:", stringFont, brushCommon, 100, 70); 

    // Fill ellipse on screen. 
    using(Brush brushLeft = new SolidBrush(Color.Blue)) 
    {  
     e.Graphics.FillEllipse(brushLeft, leftVenn); 
     e.Graphics.DrawEllipse(Pens.White, leftVenn); 
    } 

    using(Brush brushRight = new SolidBrush(Color.LightPink)) 
    { 
     e.Graphics.FillEllipse(brushRight, rightVenn);   
     e.Graphics.DrawEllipse(Pens.White, rightVenn); 
    } 

    using (GraphicsPath circle_path = new GraphicsPath()) 
    { 
     circle_path.AddEllipse(leftVenn); 
     region1.Intersect(circle_path); 
    } 

    using (GraphicsPath circle_path = new GraphicsPath()) 
    { 
     circle_path.AddEllipse(rightVenn); 
     region1.Intersect(circle_path); 
    } 

    using(Brush brushCommon = new SolidBrush(Color.Purple)) 
    { 
     e.Graphics.FillRegion(brushCommon, region1); 
    } 

} 

輸出：

Answer 2

你可以使用一個半透明的顏色，這樣的顏色重疊部分是兩個圓圈的實際複合顏色

Brush brushLeft = new SolidBrush(Color.FromArgb(50, Color.Blue)); 
Brush brushRight = new SolidBrush(Color.FromArgb(50, Color.Red));