public Triangle(Node3d p1, Node3d p2, Node3d p3)
{
this.nodes[0] = p1;
this.nodes[1] = p2;
this.nodes[2] = p3;
UpCenter();
UpNormal();
}
public void UpNormal()
{
Node3d v1 = new Node3d(nodes[2].x - nodes[0].x, nodes[2].y - nodes[0].y, nodes[2].z - nodes[0].z);
Node3d v2 = new Node3d(nodes[2].x - nodes[1].x, nodes[2].y - nodes[1].y, nodes[2].z - nodes[1].z);
normal = new Node3d(v1.y * v2.z - v1.z * v2.y, v1.z * v2.x - v1.x * v2.z, v1.x * v2.y - v1.y * v2.x);
double length = Math.Sqrt(normal.x * normal.x + normal.y * normal.y + normal.z * normal.z);
normal = new Node3d(normal.x / length, normal.y / length, normal.z / length);
}
public double CalculateLight(Node3d sloneczko)
{
Node3d lightV = new Node3d(sloneczko.x - center.x, sloneczko.y - center.y, sloneczko.z - center.z);
double length = Math.Sqrt(lightV.x * lightV.x + lightV.y * lightV.y + lightV.z * lightV.z);
lightV = new Node3d(lightV.x / length, lightV.y / length, lightV.z / length);
double kd = 0.8;
double lambert = Math.Abs(kd * 255 * (lightV.x * normal.x + lightV.y * normal.y + lightV.z * normal.z));
return(lambert);
}
public void RotateZ(Node3d axis, double alpha)
{
double tx = x - axis.x;
double ty = y - axis.y;
double tempX = tx * Math.Cos(alpha) - ty * Math.Sin(alpha);
ty = tx * Math.Sin(alpha) + ty * Math.Cos(alpha);
tempX += axis.x;
ty += axis.y;
x = tempX;
y = ty;
}
public void RotateY(Node3d axis, double alpha)
{
double tx = x - axis.x;
double tz = z - axis.z;
double tempX = tx * Math.Cos(alpha) - tz * Math.Sin(alpha);
tz = tx * Math.Sin(alpha) + tz * Math.Cos(alpha);
tempX += axis.x;
tz += axis.z;
x = tempX;
z = tz;
}
public void RotateX(Node3d axis, double alpha)
{
double ty = y - axis.y;
double tz = z - axis.z;
double tempY = ty * Math.Cos(alpha) - tz * Math.Sin(alpha);
tz = ty * Math.Sin(alpha) + tz * Math.Cos(alpha);
tempY += axis.y;
tz += axis.z;
y = tempY;
z = tz;
}
public static int n = 50; //ilosc wierzchkolkow
public static Node3d[] GetNodes()
{
double central = 200;
Node3d[] nodes = new Node3d[n];
double r = 200, y = 350;
double j = 2 * Math.PI / (nodes.Length - 1); //ilosc wierzchoklkow w podstawie
for (int i = 0; i < nodes.Length - 1; i++) //-1 ponieważ nie biore ostatniego wierzcholka bedacego szczytem
{
nodes[i] = new Node3d(r * Math.Sin(i * j) + central, y, r * Math.Cos(i * j) + central);
Console.WriteLine(r * Math.Cos(i * j) + central);
}
nodes[nodes.Length - 1] = new Node3d(central, 100, central);
return(nodes);
}
public void PrintTriangle(Bitmap bp, Node3d light)
{
double[] sy = new double[3];
for (int i = 0; i < 3; i++)
{
sy[i] = nodes[i].y;
}
Array.Sort(sy, nodes);
double x;
int l = (int)CalculateLight(light);
for (double y = sy[0]; y < sy[2]; y++)
{
x = nodes[0].x + (nodes[2].x - nodes[0].x) * ((nodes[0].y - y) / (nodes[0].y - nodes[2].y));
Pen blackPen = new Pen(Color.FromArgb(l, l, l), 3);
// Draw line to screen.
using (var graphics = Graphics.FromImage(bp))
{
graphics.DrawLine(blackPen, (float)x, (float)y, (float)nodes[1].x, (float)nodes[1].y);
}
}
}
public void UpCenter()
{
center = new Node3d((nodes[0].x + nodes[1].x + nodes[2].x) / 3, (nodes[0].y + nodes[1].y + nodes[2].y) / 3, (nodes[0].z + nodes[1].z + nodes[2].z) / 3);
}