using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections.Generic;
namespace Assistance {
public class ModifierSnowflake: Modifier {
public static readonly int rays = 6;
public ActivePoint center;
public ModifierSnowflake(Document document, Point center): base(document) {
this.center = new ActivePoint(this, ActivePoint.Type.CircleCross, center);
}
public override void draw(System.Drawing.Graphics g) {
for(int i = 0; i < rays/2; ++i) {
Point pp0 = center.position;
Point pp1 = center.position + new Point(100.0, 0.0).rotate( i*2.0*Math.PI/(double)rays );
Geometry.truncateInfiniteLine(new Rectangle(g.VisibleClipBounds), ref pp0, ref pp1);
g.DrawLine(pen, pp0.toFloat(), pp1.toFloat());
}
}
public override void getTransformFuncs(List<Geometry.TransformFunc> transformFuncs) {
Point p0 = center.position;
for(int i = 0; i < rays; ++i) {
double angle = i*2.0*Math.PI/(double)rays;
double s = Math.Sin(angle);
double c = Math.Cos(angle);
transformFuncs.Add(delegate(Point p) {
double x = p.x - p0.x;
double y = p.y - p0.y;
return p0 + new Point(c*x - s*y, s*x + c*y);
});
transformFuncs.Add(delegate(Point p) {
double x = p.x - p0.x;
double y = p.y - p0.y;
return p0 + new Point(c*x + s*y, s*x - c*y);
});
}
}
}
}