画矩形问题

Question

如何在一个pictrueBox上面绘制矩形，要求鼠标按下时移动鼠标，矩形的形状随着鼠标的移动而改变，有点类似于 acdsee的截图工具。基本思路是有了，但是就是不能在pictureBox上面绘图，大家帮忙看看
private void pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
shouldPaint = true;
beginPoint  = new Point(e.X,e.Y);
} private void pictureBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
Graphics g = this.CreateGraphics();
shouldPaint = false;
endPoint    = new Point(e.X,e.Y);
g.DrawRectangle(new Pen(Color.Black,10),beginPoint.X,beginPoint.Y,
Math.Abs(beginPoint.X - endPoint.X),Math.Abs(beginPoint.Y - endPoint.Y));
}

Answer 1

你可以参考delphi 2005中shapes这个例子F:\Program Files\Borland\BDS\3.0\Demos\CSharp\Graphics\Shapes

Answer 2

delphi 有这样的 源代码

Answer 3

private void pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
beginPoint  = new Point(e.X,e.Y);
} private void pictureBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
Graphics g = this.pictureBox1.CreateGraphics();
endPoint    = new Point(e.X,e.Y);
point = new Point[5];
point[0]      = beginPoint;
point[1]      = new Point(endPoint.X,beginPoint.Y);
point[2]   = endPoint;
point[3]      = new Point(beginPoint.X,endPoint.Y);
    point[4]      = new Point(beginPoint.X,beginPoint.Y);
g.DrawLines(new Pen(Color.White,1),point);
}知道了，结果这么简单，汗~~~~~