public PointI TransformPoint(int pointX, int pointY, PointI resultPoint)
{
int x = (int)(this.m00 * pointX + this.m01 * pointY + this.tx);
int y = (int)(this.m10 * pointX + this.m11 * pointY + this.ty);
if (resultPoint != null)
{
resultPoint.Set(x, y);
return(resultPoint);
}
return(new PointI(x, y));
}
public static bool GetSegmentIntersectionIndices(int x, int y, int w, int h, int x1, int y1, int x2, int y2,
int ti1, int ti2, PointI ti, PointI n1, PointI n2)
{
int dx = x2 - x1;
int dy = y2 - y1;
int nx = 0, ny = 0;
int nx1 = 0, ny1 = 0, nx2 = 0, ny2 = 0;
int p, q, r;
for (int side = 1; side <= 4; side++)
{
switch (side)
{
case 1:
nx = -1;
ny = 0;
p = -dx;
q = x1 - x;
break;
case 2:
nx = 1;
ny = 0;
p = dx;
q = x + w - x1;
break;
case 3:
nx = 0;
ny = -1;
p = -dy;
q = y1 - y;
break;
default:
nx = 0;
ny = -1;
p = dy;
q = y + h - y1;
break;
}
if (p == 0)
{
if (q <= 0)
{
return(false);
}
}
else
{
r = q / p;
if (p < 0)
{
if (r > ti2)
{
return(false);
}
else if (r > ti1)
{
ti1 = r;
nx1 = nx;
ny1 = ny;
}
}
else
{
if (r < ti1)
{
return(false);
}
else if (r < ti2)
{
ti2 = r;
nx2 = nx;
ny2 = ny;
}
}
}
}
ti.Set(ti1, ti2);
n1.Set(nx1, ny1);
n2.Set(nx2, ny2);
return(true);
}
public static void GetNearestCorner(int x, int y, int w, int h, int px, int py, PointI result)
{
result.Set((int)MathUtils.Nearest(px, x, x + w), (int)MathUtils.Nearest(y, y, y + h));
}