Hi,

At Runtime We have a "Two Arrow-Making Mode", "Linear Mode" and "Circular Mode".
Their Making Step is follows ..

1. Make Two nodes for arrow.

2. Linear Mode: Making the General Straight line Arrow between two node.
http://pic7.ohpy.com/up/elbbs/2008/12/23/161924/1373801024/mid_linear.gif

3. Circular Mode: Mouse move on flowchart then Arrow's shape is changed to Arc and Change the Radius od arc by Mouse position.
http://pic7.ohpy.com/up/elbbs/2008/12/23/161924/1419977995/mid_circular2.gif

Radius is calculated by distance between mouse position and Start node position.
http://pic7.ohpy.com/up/elbbs/2008/12/23/161924/1396843125/mid_circular.gif

4. Finally When MouseUp, the ArcArrow must be fixed on the flowchart.   

--------------------------------------
For Above, With GDI+ Grapgics, Arc Changing with Mouse Moving is completed. But making with customdraw of flowchart is not easy ...

help us!

Hi, Thanks, But

We already have the mathmatical algorithm for Arc Bezier curve.

The matter is that, We don't know the "CustomDraw coding method" for defined 4-step arrow mode.   

Especially, Connecting the Mouse-Move event and Arc-changing at runtime is difficult.

And Mouse-Up event and fixing the Varied curve on flowchart is also difficult to us. 

Merry Christmas!

OK, It's possible,

But Control Point's footprint is remained on mouse track.
http://pic7.ohpy.com/up/elbbs/2008/12/26/161924/1592641632/mid_controlp.gif


Is it normal?

Thanks.

	  private void flowChart1_MouseMove(object sender, MouseEventArgs e)
	  {
		PointF points = new PointF();
		points.X = 150;
		points.Y = 150;
		if (IsArc == true)
		{
		    a1.Style = ArrowStyle.Bezier;
		    a1.ControlPoints[1] = new PointF(150, 150);
		    a1.ControlPoints[2] = new PointF((float)e.X-5, (float)e.Y-5);
		    a1.UpdateFromPoints();
		}
	  }
 

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using MindFusion.Diagramming.WinForms;

namespace ArcTest2
{
    public partial class Form1 : Form
    {

  bool IsArc;

  Arrow a1;


  public Form1()

  {


InitializeComponent();



flowChart1.AntiAlias = SmoothingMode.AntiAlias;


flowChart1.MeasureUnit = GraphicsUnit.Pixel;


flowChart1.DoubleBuffer = true;




IsArc = false;


toolStripStatusLabel1.Text = "직선 모드";

  }

  // 마우스 무브

  private void Form1_Load(object sender, EventArgs e)

  {


Box b1 = flowChart1.CreateBox(100-5, 200-5, 10, 10);


Box b2 = flowChart1.CreateBox(200-5, 100-5, 10, 10);



a1 = flowChart1.CreateArrow(b1, b2);


a1.PenWidth = 5;


a1.PenColor = Color.Red;

  }

  // 마우스 무브

  private void flowChart1_MouseMove(object sender, MouseEventArgs e)

  {


PointF docPoint = flowChart1.ClientToDoc(new Point(e.X+100, e.Y));


PointF docPoint2 = flowChart1.ClientToDoc(new Point(e.X, e.Y+100));


if (IsArc == true)


{


    flowChart1.Invalidate();



    a1.Style = ArrowStyle.Bezier;


    a1.ControlPoints[0] = new PointF(100, 200);


    a1.ControlPoints[1] = docPoint;


    a1.ControlPoints[2] = docPoint2;


    a1.ControlPoints[3] = new PointF(200, 100);


    a1.UpdateFromPoints();


}

  }

  // 마우스 다운

  private void arcModeToolStripMenuItem_Click(object sender, EventArgs e)

  {


IsArc = true;


toolStripStatusLabel1.Text = "곡선 모드";

  }

  // 마우스업

  private void flowChart1_MouseUp(object sender, MouseEventArgs e)

  {


IsArc = false;


toolStripStatusLabel1.Text = "곡선모드 종료";

  }
    }
}
 

Thanks, Stoyan

Happy New Year~

Using the code from this article for calculating the arc parameters from three points:
http://www.sedris.org/sdk_4.1.1/docs/tech/drm/classes/Arc.htm

You can custom-draw the link as shown here:
http://mindfusion.eu/_samples/draw_arc.txt

I hope that helps,
Stoyan

Seems in the bad cases you should swap the start and end angle values found for the three points. I suppose you could detect you are in the bad case by checking if the middle control point and the median point from the arc lie at different sides of the line defined by ControlPoints[0] and ControlPoints[2]. I.e. you would receive one negative and one positive value when you replace the point coordinates in the line equation.

I hope that helps,
Stoyan

That IsArc boolean flag, are you setting it back to false at some point?