大家好，问个弱弱的问题，用C#处理图片，怎么能把图片的四个角变平滑也就是画弧，谢谢！

Question

RT
谢谢大家

Answer 1

用gdi+对图形进行裁减保存。
还有种方法在4个角画上圆弧

Answer 2

void DrawRoundRect(int radii,Rectangle Rect,Graphics g)
{
Pen pen=new Pen(this.ForeColor,2);
g.DrawLine(pen,Rect.Left+radii,Rect.Top,Rect.Right-radii,Rect.Top);
g.DrawLine(pen,Rect.Left+radii,Rect.Bottom,Rect.Right-radii,Rect.Bottom);
g.DrawLine(pen,Rect.Left,Rect.Top+radii,Rect.Left,Rect.Bottom-radii);
g.DrawLine(pen,Rect.Right,Rect.Top+radii,Rect.Right,Rect.Bottom-radii);g.DrawArc(pen,new Rectangle(Rect.Left,Rect.Top,radii*2,radii*2),180,90);
g.DrawArc(pen,new Rectangle(Rect.Left,Rect.Bottom-radii*2,radii*2,radii*2),90,90);
g.DrawArc(pen,new Rectangle(Rect.Right-radii*2,Rect.Top,radii*2,radii*2),-90,90);
g.DrawArc(pen,new Rectangle(Rect.Right-radii*2,Rect.Bottom-radii*2,radii*2,radii*2),0,90);}private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
DrawRoundRect(15,new Rectangle(10,10,150,150),e.Graphics);
}