private Size scaleToScreen(flPoint p)
{
//return p;
Size value = new Size();
value.Width = (int)Math.Round((szScreen.Width * p.X) / szViewport.Width);
value.Height = (int)Math.Round((szScreen.Height * p.Y) / szViewport.Height);
return(value);
}
private Point viewportToScreen(flPoint p)
{
//return p;
Point value = new Point();
value.X = (int)Math.Round((szScreen.Width * p.X) / szViewport.Width);
value.Y = szScreen.Height - (int)Math.Round((szScreen.Height * p.Y) / szViewport.Height);
//value.Y = (szScreen.Height - (szScreen.Height * p.Y) / szViewport.Height) * -1;
return(value);
}
private void DrawCircle(Graphics g, flPoint c, double r)
{
Point scrCenter = viewportToScreen(c);
Size scrRadii = scaleToScreen(new flPoint(r, r));
Rectangle boundingRec = new Rectangle(scrCenter.X - scrRadii.Width, scrCenter.Y - scrRadii.Height,
2 * scrRadii.Width, 2 * scrRadii.Height);
g.DrawEllipse(currentPen, boundingRec);
// flPoint[] circle = new flPoint[circularTessellation];
// flPoint[] quarterCircle = new flPoint[circularTessellation/4];
// double deltaAngle = (2 * Math.PI) / circularTessellation;
// // first half quadrent
// for (int idx = 0; idx < circularTessellation / 8; idx++)
// {
// double angle = (deltaAngle * idx) + (deltaAngle/2);
// double x = Math.Sin(angle) * r;
// double y = Math.Cos(angle) * r;
// quarterCircle[idx] = new flPoint(x, y);
// circle[idx] = quarterCircle[idx].Translate(c);
// }
// //DrawPolygon(g, circle);
// // second half quadrent
// for (int idx = 0; idx < circularTessellation / 8; idx++)
// {
// quarterCircle[idx + circularTessellation / 8] =
// new flPoint(quarterCircle[(circularTessellation / 8) - idx - 1].Y,
// quarterCircle[(circularTessellation / 8) - idx - 1].X);
// circle[idx + circularTessellation / 8] = quarterCircle[idx + circularTessellation / 8].Translate(c);
// }
// //DrawPolygon(g, circle);
// // second quadrent
// for (int idx = 0; idx < circularTessellation / 4; idx++)
// {
// circle[idx + circularTessellation / 4] = quarterCircle[circularTessellation / 4 - idx - 1].Scale(1, -1).Translate(c);
// }
// //DrawPolygon(g, circle);
// // third quadrent
// for (int idx = 0; idx < circularTessellation / 4; idx++)
// {
// circle[idx + circularTessellation / 2] = quarterCircle[idx].Scale(-1, -1).Translate(c);
// }
// //DrawPolygon(g, circle);
//// fourth quadrent
// for (int idx = 0; idx < circularTessellation / 4; idx++)
// {
// circle[idx + ((circularTessellation * 3) / 4)] = quarterCircle[circularTessellation / 4 - idx - 1].Scale(-1, 1).Translate(c);
// }
// DrawPolygon(g, circle);
}
private void DrawArc(Graphics g, flPoint c, double r, double a)
{
int tessellation = (int)Math.Ceiling(circularTessellation * Math.Abs(a) / 360.0);
flPoint[] arc = new flPoint[tessellation + 1];
double deltaAngle = (2 * Math.PI) / circularTessellation;
if (a < 0)
{
deltaAngle *= -1;
}
for (int idx = 0; idx <= tessellation; idx++)
{
double angle = (deltaAngle * idx);
double x = Math.Sin(angle) * r + c.X;
double y = Math.Cos(angle) * r + c.Y;
arc[idx] = new flPoint(x, y);
}
DrawPolyLine(g, arc);
}
private void DrawLine(Graphics g, flPoint p1, flPoint p2)
{
g.DrawLine(currentPen, viewportToScreen(p1), viewportToScreen(p2));
}
public Line Scale(flPoint scale)
{
return(new Line(P1.Scale(scale), P2.Scale(scale)));
}
//public flPoint(Point p) { X = p.X; Y = p.Y; }
public Line Translate(flPoint delta)
{
return(new Line(P1.Translate(delta), P2.Translate(delta)));
}
public Line(Point p1, Point p2)
{
P1 = new flPoint(p1); P2 = new flPoint(p2);
}
public Line(flPoint p1, flPoint p2)
{
P1 = p1; P2 = p2;
}
public flPoint Scale(flPoint scale)
{
return(new flPoint(X * scale.X, Y * scale.Y));
}
public flPoint Translate(flPoint delta)
{
return(new flPoint(X + delta.X, Y + delta.Y));
}