Question

用C#.net的GDI+画图，如何实现图像的旋转，比如直线，矩形，椭圆等等，用RotateTransform或者不用都可以

直线，矩形等等图形已经画出来了，现在是要实现旋转，90°就可以，不必太麻烦，最好能用RotateTransform实现，谢了

Answer 1

画“直线，矩形，椭圆”这个是怎么画的？？？c#.net GDI+里面有相应的函数，那旋转是一样的，你画直线时，需要提供参数，画矩形时也需要提供参数，旋转只不过是参数变量变了而已。求出变量就可以了！

Answer 2

using System.Drawing.Drawing2D;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void 直线ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Refresh();
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.BlueViolet, 4);
p.DashStyle = DashStyle.DashDotDot;//虚线样式
p.StartCap = LineCap.RoundAnchor;
p.EndCap = LineCap.Round;//线帽样式
g.DrawLine(p, 50, 50, 200, 200);
}
private void 矩形ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Refresh();
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.BlueViolet, 4);
Rectangle rec = new Rectangle(50, 50, 200, 200);
g.DrawRectangle(p, rec);
}
private void 圆ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Refresh();
Graphics g = this.CreateGraphics();
Pen p = new Pen(Color.BlueViolet, 4);
Rectangle rec = new Rectangle(50, 50, 200, 200);
g.DrawEllipse(p, rec);
}
//里面的数适当改变一下就可以了！ 需要用到MenuStrip控件！