cloth
annotate src/disc.cc @ 3:28a31079dcdf
disc
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Mon, 04 Jan 2016 10:52:15 +0200 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@3 | 1 #include "disc.h" |
| nuclear@3 | 2 #include "opengl.h" |
| nuclear@3 | 3 #include "simworld.h" |
| nuclear@3 | 4 |
| nuclear@3 | 5 Disc::Disc() |
| nuclear@3 | 6 { |
| nuclear@3 | 7 radius = 1.0f; |
| nuclear@3 | 8 } |
| nuclear@3 | 9 |
| nuclear@3 | 10 Disc::Disc(const Vector3 &pt, const Vector3 &norm, float rad) |
| nuclear@3 | 11 : Plane(pt, norm) |
| nuclear@3 | 12 { |
| nuclear@3 | 13 radius = rad; |
| nuclear@3 | 14 } |
| nuclear@3 | 15 |
| nuclear@3 | 16 bool Disc::collision(const Ray &ray, float rad, Collision *col) const |
| nuclear@3 | 17 { |
| nuclear@3 | 18 if(!Plane::collision(ray, rad, col)) { |
| nuclear@3 | 19 return false; |
| nuclear@3 | 20 } |
| nuclear@3 | 21 Vector3 pt = this->pt - normal * rad; |
| nuclear@3 | 22 float dist_sq = (col->pos - pt).length_sq(); |
| nuclear@3 | 23 if(dist_sq > radius * radius) { |
| nuclear@3 | 24 return false; |
| nuclear@3 | 25 } |
| nuclear@3 | 26 return true; |
| nuclear@3 | 27 } |
| nuclear@3 | 28 |
| nuclear@3 | 29 void Disc::draw() const |
| nuclear@3 | 30 { |
| nuclear@3 | 31 Matrix4x4 rot_matrix = calc_rot_matrix(); |
| nuclear@3 | 32 |
| nuclear@3 | 33 glMatrixMode(GL_MODELVIEW); |
| nuclear@3 | 34 glPushMatrix(); |
| nuclear@3 | 35 glMultTransposeMatrixf(rot_matrix[0]); |
| nuclear@3 | 36 |
| nuclear@3 | 37 glBegin(GL_TRIANGLE_FAN); |
| nuclear@3 | 38 glNormal3f(normal.x, normal.y, normal.z); |
| nuclear@3 | 39 glVertex2f(0, 0); |
| nuclear@3 | 40 const int segm = 42; |
| nuclear@3 | 41 for(int i=0; i<segm; i++) { |
| nuclear@3 | 42 float u = (float)i / (float)(segm - 1); |
| nuclear@3 | 43 float theta = u * M_PI * 2.0; |
| nuclear@3 | 44 float x = cos(theta) * radius; |
| nuclear@3 | 45 float y = sin(theta) * radius; |
| nuclear@3 | 46 glVertex2f(x, y); |
| nuclear@3 | 47 } |
| nuclear@3 | 48 glEnd(); |
| nuclear@3 | 49 |
| nuclear@3 | 50 glPopMatrix(); |
| nuclear@3 | 51 } |