Drawing Curves
.NET supports two forms of curves. These are the cardinal spline and the Bezier spline. In general, curves are represented by a line passing through points on the drawing surface in a particular direction. Curve tension is based on the pull from points outside of the curve’s line.
The Cardinal Spline
The cardinal spline is defined by a line that passes directly through the array of points. A tension value determines the bend of the line. When the tension is lower, the curve’s bend will be flatter. Listing 7.6 shows the code for drawing a cardinal spline.
Listing 7.6. Drawing the Cardinal Spline
1: procedure TWinForm.paintCardinal; 2: var 3: MyPointsAry: array[0..2] of Point; 4: begin 5: MyPen.Color := Color.Blue; 6: MyPen.Width ... |
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