//
private ArrayOfPoints createLoop(int num)
{
ArrayOfPoints a = new ArrayOfPoints();
if (num < 2)
{
log("createLoop error num must >=2,now num:" + num);
}
double angle = (double)(num - 2) * Math.PI / (double)(num);
//
MyPoint p = new MyPoint(-1, 0);
a.push(p);
int i;
for (i = 1; i < num; i++)
{
p = a[i - 1];
a.push(rotateMyPoint(new MyPoint(-p.X, -p.Y), angle));
}
a[0] = new MyPoint(0, 0);
for (i = 1; i < num; i++)
{
MyPoint tempP = a[i];
a[i] = tempP.add(a[i - 1]);
}
return(a);
}
private ArrayOfPoints arrayAdd(ArrayOfPoints arr, MyPoint adden)
{
for (int i = 0; i < arr.Length; i++)
{
MyPoint p = arr[i];
arr[i] = p.add(adden);
}
return(arr);
}
private ArrayOfPoints getCutLine(MyPoint from, MyPoint to, double cut)
{
ArrayOfPoints r = new ArrayOfPoints(2);
MyPoint origin = from;
MyPoint dir = to.sub(from);
double len = dir.Length;
if (len <= cut * 2)
{
r[0] = from;
r[1] = from;
return(r);
}
dir = pointMulti(dir, 1 / len);
from = origin.add(pointMulti(dir, cut));
to = origin.add(pointMulti(dir, len - cut));
//
r[0] = from;
r[1] = to;
return(r);
}
private void drawStr(Graphics g, String str, MyPoint p, float fontSize, Color fontColor)
{
MyPoint offset = new MyPoint((float)(-fontSize * 0.05), (float)(-fontSize * 0.17));
g.DrawString(str, new Font("宋体", fontSize), new SolidBrush(fontColor), p.add(new MyPoint(-fontSize / 2, -fontSize / 2)).add(offset).toPointF());
}