the user should be able to draw a straight line on a panel similar to drawing a straight line in paint .
the user clicks on the panel and when he moves the mouse the line should also move along with the mouse (ie similar to drawing a staright line in paint) and when the user releases the mouse the line should have been drawn from the original point of click to this release point .
ie not a free hand line.
is there any animation for this ?
How about this? :
public class LinePanel : Panel
{
public LinePanel()
{
this.MouseDown += (src, e) => { LineStartPos = LineEndPos = e.Location; Capture = true; Invalidate(); };
this.MouseMove += (src, e) => { if (Capture) { LineEndPos = e.Location; Invalidate(); } };
this.MouseUp += (src, e) => { if (Capture) { LineEndPos = e.Location; } Capture = false; Invalidate(); };
}
private Point LineStartPos, LineEndPos;
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (LineStartPos != LineEndPos)
e.Graphics.DrawLine(new Pen(Color.Black, 2), LineStartPos, LineEndPos);
}
}
To test you can just add a new LinePanel() to the Controls collection of your form, and set location/size or anchor / dock paramaters to size it.
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