/**
* Add the intersections of triangle t with the section to the list of
* intersection (set)
*/
void cut(Triangle_dt t)
{
if (t.isHalfplane())
{
return;
}
Point_dt p1 = t.p1(), p2 = t.p2(), p3 = t.p3();
int f1 = p1.pointLineTest(_p1, _p2);
int f2 = p2.pointLineTest(_p1, _p2);
int f3 = p3.pointLineTest(_p1, _p2);
if ((f1 == Point_dt.LEFT | f1 == Point_dt.RIGHT) &&
(f1 == f2 && f1 == f3))
{
return;
}
if (f1 != f2 && _p1.pointLineTest(p1, p2) != _p2.pointLineTest(p1, p2))
{
Add(intersection(p1, p2));
}
if (f2 != f3 && _p1.pointLineTest(p2, p3) != _p2.pointLineTest(p2, p3))
{
Add(intersection(p2, p3));
}
if (f3 != f1 && _p1.pointLineTest(p3, p1) != _p2.pointLineTest(p3, p1))
{
Add(intersection(p3, p1));
}
}
/** return true iff the segment _p1,_p2 is cutting t */
bool cut(Point_dt pp1, Point_dt pp2, Triangle_dt t)
{
bool ans = false;
if (t.isHalfplane())
{
return(false);
}
Point_dt p1 = t.p1(), p2 = t.p2(), p3 = t.p3();
int f1 = p1.pointLineTest(pp1, pp2);
int f2 = p2.pointLineTest(pp1, pp2);
int f3 = p3.pointLineTest(pp1, pp2);
if ((f1 == Point_dt.LEFT | f1 == Point_dt.RIGHT) &&
(f1 == f2 && f1 == f3))
{
return(false);
}
if (f1 != f2 && pp1.pointLineTest(p1, p2) != pp2.pointLineTest(p1, p2))
{
return(true);
}
if (f2 != f3 && pp1.pointLineTest(p2, p3) != pp2.pointLineTest(p2, p3))
{
return(true);
}
if (f3 != f1 && pp1.pointLineTest(p3, p1) != pp2.pointLineTest(p3, p1))
{
return(true);
}
return(ans);
}
public void drawTriangle(Graphics g, Triangle_dt t, Color cl)
{
if (_view_flag == VIEW1 || t.isHalfplane())
{
if (t.isHalfplane())
{
if (cl == Color.Empty)
{
drawLine(g, t.p1(), t.p2(), Color.Blue);
}
else
{
drawLine(g, t.p1(), t.p2(), cl);
}
}
else
{
if (cl == Color.Empty)
{
drawLine(g, t.p1(), t.p2(), Color.Black);
drawLine(g, t.p2(), t.p3(), Color.Black);
drawLine(g, t.p3(), t.p1(), Color.Black);
}
{
drawLine(g, t.p1(), t.p2(), cl);
drawLine(g, t.p2(), t.p3(), cl);
drawLine(g, t.p3(), t.p1(), cl);
}
}
}
else
{
// //////////////////////////////////////////////////////////////////
double maxZ = _ajd.maxBoundingBox().z;
double minZ = _ajd.minBoundingBox().z;
double z = (t.p1().z + t.p2().z + t.p3().z) / 3.0;
double dz = maxZ - minZ;
if (dz == 0)
{
dz = 1;
}
int co = 30 + (int)(220 * ((z - minZ) / dz));
if (cl == Color.Empty)
{
cl = Color.FromArgb(co, co, co);
}
int[] xx = new int[3], yy = new int[3];
// double f = 0;
// double dx_map = _dx_map.y- _dx_map.x;
// double dy_map = _dy_map.y- _dy_map.x;
// f = (t.p1().x -_dx_map.x)/dx_map;
Point_dt p1 = world2screen(t.p1());
xx[0] = (int)p1.x;
yy[0] = (int)p1.y;
Point_dt p2 = world2screen(t.p2());
xx[1] = (int)p2.x;
yy[1] = (int)p2.y;
Point_dt p3 = world2screen(t.p3());
xx[2] = (int)p3.x;
yy[2] = (int)p3.y;
Brush b = new SolidBrush(cl);
g.FillPolygon(b, ToPoints(xx, yy));
// ////////////////////////////////////
}
}
void drawTriangleTopoLines(Graphics g, Triangle_dt t, double dz, Color cl)
{
if (t.p1().z < 0 | t.p2().z < 0 | t.p3().z < 0)
{
return;
}
Point_dt[] p12 = computePoints(t.p1(), t.p2(), dz);
Point_dt[] p23 = computePoints(t.p2(), t.p3(), dz);
Point_dt[] p31 = computePoints(t.p3(), t.p1(), dz);
int i12 = 0, i23 = 0, i31 = 0;
bool cont = true;
while (cont)
{
cont = false;
if (i12 < p12.Length && i23 < p23.Length && p12[i12].z == p23[i23].z)
{
if (p12[i12].z % 200 > 100)
{
drawLine(g, p12[i12], p23[i23], Color.Red);
}
else
{
drawLine(g, p12[i12], p23[i23], Color.Yellow);
}
i12++;
i23++;
cont = true;
}
if (i23 < p23.Length && i31 < p31.Length && p23[i23].z == p31[i31].z)
{
if (p23[i23].z % 200 > 100)
{
drawLine(g, p23[i23], p31[i31], Color.Red);
}
else
{
drawLine(g, p23[i23], p31[i31], Color.Yellow);
}
i23++;
i31++;
cont = true;
}
if (i12 < p12.Length && i31 < p31.Length && p12[i12].z == p31[i31].z)
{
if (p12[i12].z % 200 > 100)
{
drawLine(g, p12[i12], p31[i31], Color.Red);
}
else
{
drawLine(g, p12[i12], p31[i31], Color.Yellow);
}
i12++;
i31++;
cont = true;
}
}
}