我怎样才能改变这种代码以绘制一个圆角矩形
public partial class MikePainter : Form
{
private Bitmap PicInMemory;
private Graphics PaintOnMyPic;
private int SecondX;
private int SecondY;
public MikePainter()
{
InitializeComponent();
PicInMemory = new Bitmap(panel1.Width, panel1.Height);
Graphics PaintOnMyPic = Graphics.FromImage(PicInMemory);
///////////How to change this code to draw rounded rectangle////////////////
private void OnMouseMove(object sender, MouseEventArgs e)
{
if (Selectedtool == Rect ) --> Check if the selectTool is rect
{
Pen myPen = new Pen(Color.Black);
Graphics PaintOnPanel = panel1.CreateGraphics();
PaintOnPanel.DrawImage(PicInMemory, 0, 0);
PaintOnPanel.DrawRectangle(myPen, SecondX,SecondY,e.X - SecondX,e.Y - SecondY);
}
}
private void OnMouseUp(object sender, MouseEventArgs e)
{
if (Selectedtool == Rect )
{
Graphics PaintOnPic = Graphics.FromImage(PicInMemory);
Pen myPen = new Pen(Color.Black);
PaintOnPic.DrawRectangle(myPen, SecondX, SecondY, e.X - SecondX, e.Y - SecondY);
Graphics PaintOnPanel = panel1.CreateGraphics();
PaintOnPanel.DrawImage(PicInMemory, 0, 0);
}
}
private void OnMouseDown(object sender, MouseEventArgs e)
{
SecondX = e.X;
SecondY = e.Y;
}