c锐图(图形) [英] c sharp drawing (graphic)

问题描述

当我在面板上创建图形时..如果我最小化和最大化窗体，则图形将被删除

如何防止清晰的图纸

我测试了flush()和dispose()

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When i create drawing on panel .. if i minimize and maximize the form, drawing will be erased

how can i prevent clear drawing

i test flush(), and dispose()

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private void button1_Click(object sender, EventArgs e)
{
     priceValue();
     Diagrams f2 = new Diagrams();
     f2.Show();
     Graphics g1 = f2.panel1.CreateGraphics();
     g1.Clear(f2.panel1.BackColor);
     Pen pen1 = new Pen(Color.Black,1);
     g1.DrawLine(pen1, 100, 400, 600, 400);
     g1.DrawLine(pen1, 100, 50, 100, 400);
     Font myFont = new System.Drawing.Font("Ubuntu_Titling_Rg", 10, FontStyle.Bold);
     Brush myBrush = new SolidBrush(System.Drawing.Color.Gold);
     int i=0;
     do
     {
         g1.DrawLine(pen1, 95, 50 + i, 100, 50 + i);
         i += 70;
     }
     while (i <= 350);
     System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat(StringFormatFlags.DirectionVertical);
     g1.DrawString(comboBox1.Text + " items cost schedule", myFont, myBrush, 15, 120, drawFormat);
     g1.DrawString("0", myFont, myBrush, 70, 390);
     g1.DrawString(lastPrice.ToString(), myFont, myBrush, 65, 320);
     g1.DrawString(midP3rice.ToString(), myFont, myBrush, 60, 250);
     g1.DrawString(midPrice.ToString(), myFont, myBrush, 57, 180);
     g1.DrawString(mid2Price.ToString(), myFont, myBrush, 50, 110);
     g1.DrawString(firstPrice.ToString(), myFont, myBrush, 50, 40);
     Pen pen2 = new Pen(Color.FromArgb(30,60,153), 5);
     Rectangle myRectangle = new Rectangle(5, 5, 658, 540);
     g1.DrawRectangle(pen2, myRectangle);
     RectangleF rect = new RectangleF(140, 110, 20, 290);
     g1.DrawString("Main Items", myFont, myBrush, 300, 500);
     int pos = 160;
     for (int j = 0; j < treeView1.Nodes.Count; j++)
     {
         if(treeView1.Parent.HasChildren == true)
             g1.DrawString(treeView1.Nodes[j].Text, myFont, myBrush, pos, 400, drawFormat);
         pos += 460/4;
     }
     g1.Save();
     g1.Dispose();
}

推荐答案

处理面板的Paint事件，并将所有绘图代码放入该处理程序中.

Handle the Paint event for your panel, and put all your drawing code inside that handler.

public Form1()
{
     InitializeComponent();

     //handle the Paint event for the panel
     panel1.Paint += (sender, e) =>
     {
          //put you drawing code here
          //and use e.Graphics instead of CreateGraphics
     };
}

或不带lambda表达式:

Or without lambda expressions:

public Form1()
{
     InitializeComponent();
     //handle the Paint event for the panel
     panel1.Paint += panel1_Paint;
}

//the painting function for panel1
private void panel1_Paint(object sender, PaintEventArgs e)
{
    //put you drawing code here
    //and use e.Graphics instead of CreateGraphics
    e.Graphics.DrawString(...);
    e.Graphics.DrawRectangle(...);
}

Olivier的答案的补充:

如果无法使用lambda(由于v.2.0)，请使用不带lambda的匿名程序.它几乎具有lambda的所有优点，仅应明确指定参数类型:

Addition to the answer by Olivier:

If lambda cannot be used (because of v.2.0), use anonymous without lambda. It will have almost all the benefits of lambda, only parameters type should be explicitly specified:

panel1.Paint += delegate(object sender, System.EventArgs eventArgs)
{
    //... same thing...
};

—SA

—SA

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