CODEWITHSUNDEEP
c#user-interfacedrawinggdi+
tomu
tomu

Reputation: 144

Is it possible to access the points in a Graphicspath?

If there is a line added to a Graphicspath with two ends location defined, is it possible to read this pair of points?

Point[] myArray =
         {
             new Point(30,30),
             new Point(60,60),

         };
GraphicsPath myPath2 = new GraphicsPath();
myPath2.AddLines(myArray2);

from myPath2, is there something similar to myPath2.Location that can give me the points (30,30) and (60,60)? Thanks

Upvotes: 3

Views: 2239

Answers (2)

Marcelo Caparoz
Marcelo Caparoz

Reputation: 11

Somethimes, Matrix don't plot correct my points, so..., in small number of paths, this is helpfull, in this example you can: read, modify and compare, points and point types, rewrite your path or create a new.. etc ..

PointF[] changedPoints = Refpath.PathData.Points;
byte[] pointTypes = Refpath.PathData.Types;

List<PointF> OriginalPoints = new List<PointF>();
PointF currentPoint = new Point();
int MyCoffe = 0;

Refpath.PathPoints
        .ToList()
            .ForEach(
                i =>
                {    
                    currentPoint = new PointF
                    {
                        X = i.X,
                        Y = i.Y
                    };
                    OriginalPoints.Add(currentPoint);

                    if (pointTypes[MyCoffe]==3)
                    { 
                        // it's a curve, see the "TaW" explantion, do something, like add text caption, etc...
                        changedPoints[MyCoffe].X -= 100; 
                        changedPoints[MyCoffe].Y -= 100;
                        // etc...
                    }

                    changedPoints[MyCoffe].X += 100; // if you want to change value
                    changedPoints[MyCoffe].Y += 100;
                    MyCoffe ++;
                }
            );
GraphicsPath newPath = new GraphicsPath(changedPoints, pointTypes);

Upvotes: 0

TaW
TaW

Reputation: 54453

Yes it is possible via GraphicsPath.PathPoints but you will need to understand the 2nd array of GraphicsPath.PathTypes!

Only if all the points are added as a simple point array of line coordinates, maybe like this: 

List<Point> points = new List<Point>();
..  // add some points!
GraphicsPath gp = new GraphicsPath();
gp.AddLines(points.ToArray());

will you be able to use/modify the points without much hassle.

If you add them via rounded shapes, like.. 

 gp.AddEllipse(ClientRectangle);

..you will need to understand the various types! The same is true when you add them as other curves gp.AddCurves(points.ToArray());

If you add them as gp.AddRectangle(ClientRectangle); you will get the regular points but with a byte type that says

0 - Indicates that the point is the start of a figure.

So in your case you get at the 1st of your points like this:

Console.WriteLine(gp.PathPoints[1].ToString());

Btw: There is no such thing as a GraphicsPath.Location; but you may find GraphicsPath.GetBounds() useful..

Note that all rounded shapes (including arcs and ellipses!) in fact consist only of bezier points:

3 - Indicates that the point is an endpoint or control point of a cubic Bézier spline

which means that the PathPoints are alternating endpoints and control points.

Upvotes: 5

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