GDI

[Jdragon]

要怎么改才能自由画笔~高手指点下，


class FreeDraw : ShapeBase
{


public FreeDraw()
{
this.shapeBase = this;
}

public override void Draw(Graphics painter)
{
GraphicsPath Path = new GraphicsPath();

Point leftTop = this.startPoint;

leftTop = new Point(this.startPoint.X,this.startPoint.Y);


Path.AddLine(leftTop,leftTop);


painter.DrawPath(this.pen,Path);
}

}

[ycproc]

class   drawPoints:Form 
{ 
private   Point   m_Start; 
private   List <Point>   m_ListPoint; 
public   drawPoints() 
{ 
this.DoubleBuffered   =   true; 
m_ListPoint   =   new   List <Point> (); 
} 
protected   override   void   OnMouseDown(MouseEventArgs   e) 
{ 
base.OnMouseDown(e); 
this.m_Start   =   e.Location; 
} 
protected   override   void   OnMouseMove(MouseEventArgs   e) 
{ 
base.OnMouseMove(e); 
if   (e.Button   ==   MouseButtons.Left) 
{ 
this.m_ListPoint.Add(e.Location); 
this.m_Start   =   e.Location; 
this.Invalidate(); 
} 
} 
protected   override   void   OnPaint(PaintEventArgs   e) 
{ 
base.OnPaint(e); 
for   (int   i   =   0;   i   <   this.m_ListPoint.Count-1;   i++) 
{ 
e.Graphics.DrawLine(SystemPens.ControlText,   this.m_ListPoint[i],   this.m_ListPoint[i   +   1]); 
} 
} 
}

[am]

同意楼上的，关键是在 OnPaint(PaintEventArgs e)中调用

[Jdragon]

我是画在pictureBox1中的

[xuexiaodong2009]

那就要在pictureBox1的OnPaint(PaintEventArgs e)中调用

[子夜__]

private void picBxSketch_Paint(object sender, PaintEventArgs e)
  {
   int distance = 40;

   Pen linePen = new Pen(Color.Red);
   for (int i = 1; i <= 4; i++) {
    //初始的四条横线，横线建的间距大一些
    e.Graphics.DrawLine(linePen, new Point(85, (distance + 10) * i + 30), new Point(240, (distance + 10) * i + 30));//横线
    e.Graphics.DrawLine(linePen, new Point(distance * i + 65, 60), new Point(distance * i + 65, 250));//竖线
   }}