如何绘制形状，窗户的模板？ [英] How to draw shapes in panels of windows form?

问题描述

我使用面板绘制形状像圆，但问题是，当我更改选项卡或最小化程序和放大器;然后最大化该程序，然后取出绘制每一件事情。任何一个可以告诉我是什么原因？

I am using panel to draw shapes like circle, but the problem is that when I change tab or minimize the program & then maximize the program, then every thing drawn removed. Can any one tell me what's the reason?

推荐答案

既然你没有张贴任何代码，你走你所有的读者猜测。我的猜测是，你是最有可能使用的createGraphics，这可能是一个错误。

Since you didn't post any code, you leave all of your readers guessing. My guess is that you are most likely using CreateGraphics, which is probably a mistake.

您面板的Paint事件应该是这个样子：

Your panel's paint event should look something like this:

private void panel1_Paint(object sender, PaintEventArgs e) {
  e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
  e.Graphics.FillEllipse(Brushes.Red, new Rectangle(10, 10, 32, 32));
}

您完成所有的绘图Paint事件。要强制刷新，只需调用 panel1.Invalidate（）。

You do all of your drawing in the paint event. To force a refresh, just call panel1.Invalidate().

如果绘制成位图，你可以处理它是这样的：

If drawing to a bitmap, you could handle it like this:

Bitmap bmp = new Bitmap(500, 500);

private void button1_Click(object sender, EventArgs e) {
  using (Graphics g = Graphics.FromImage(bmp)) {
    g.SmoothingMode = SmoothingMode.AntiAlias;
    g.Clear(Color.White);
    g.FillEllipse(Brushes.Red, new Rectangle(10, 10, 32, 32));
  }
  panel1.Invalidate();
}

private void panel1_Paint(object sender, PaintEventArgs e) {
  e.Graphics.DrawImage(bmp, new Point(0, 0));
}

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