Article	60000960
Type	HowTo
Product	Engine
Version	6
Date Added	9/16/2009
Submitted by	Jong Lee
Keywords

Subject

How can I calculate and draw some entities after a user draw command

Summary

How can I calculate and draw some entities after a user draw command ? For example I want to draw 2 lines that will represent the radius and the diameter of the circle that the user draw using an automatic command like cmdCircle.

Solution

private void button2_Click(object sender, EventArgs e)
{
    VectorDraw.Professional.vdObjects.vdDocument doc = vdFramedControl1.BaseControl.ActiveDocument;//ask the user to draw the circle
    bool cir_success=doc.CommandAction.CmdCircle(null, null);
    if (cir_success)
    { // cmdCircle is successful
        VectorDraw.Professional.vdFigures.vdCircle circ = (VectorDraw.Professional.vdFigures.vdCircle) doc.ActiveLayOut.Entities[doc.ActiveLayOut.Entities.Count - 1];
        if (circ == null) return;
        VectorDraw.Geometry.gPoint pt_center = new VectorDraw.Geometry.gPoint(circ.Center);// got the circle and its properties
        double radius = circ.Radius;

        //calculate the points @ 45, 135 and 225 degrees
        VectorDraw.Geometry.gPoint pt_45 = pt_center.Polar(VectorDraw.Geometry.Globals.HALF_PI/2.0d, radius);
        VectorDraw.Geometry.gPoint pt_225 = pt_center.Polar(5.0d*VectorDraw.Geometry.Globals.HALF_PI/2.0d, radius);
        VectorDraw.Geometry.gPoint pt_135 = pt_center.Polar(3.0d * VectorDraw.Geometry.Globals.HALF_PI / 2.0d, radius);

        // draw the lines
        VectorDraw.Professional.vdFigures.vdLine line = new VectorDraw.Professional.vdFigures.vdLine();//diameter "blue" line
        line.SetUnRegisterDocument(doc);
        line.setDocumentDefaults();
        line.StartPoint = pt_45;
        line.EndPoint = pt_225;
        line.PenColor.FromSystemColor(Color.Blue);
        doc.ActiveLayOut.Entities.AddItem(line);
        line.Invalidate();

        line = new VectorDraw.Professional.vdFigures.vdLine();//radius "red" line
        line.SetUnRegisterDocument(doc);
        line.setDocumentDefaults();
        line.StartPoint = pt_center;
        line.EndPoint = pt_135;
        line.PenColor.FromSystemColor(Color.Red);
        doc.ActiveLayOut.Entities.AddItem(line);
        line.Invalidate();
    }
}