nuclear@3: #include "disc.h"
nuclear@3: #include "opengl.h"
nuclear@3: #include "simworld.h"
nuclear@3: 
nuclear@3: Disc::Disc()
nuclear@3: {
nuclear@3: 	radius = 1.0f;
nuclear@3: }
nuclear@3: 
nuclear@3: Disc::Disc(const Vector3 &pt, const Vector3 &norm, float rad)
nuclear@3: 	: Plane(pt, norm)
nuclear@3: {
nuclear@3: 	radius = rad;
nuclear@3: }
nuclear@3: 
nuclear@3: bool Disc::collision(const Ray &ray, float rad, Collision *col) const
nuclear@3: {
nuclear@3: 	if(!Plane::collision(ray, rad, col)) {
nuclear@3: 		return false;
nuclear@3: 	}
nuclear@3: 	Vector3 pt = this->pt - normal * rad;
nuclear@3: 	float dist_sq = (col->pos - pt).length_sq();
nuclear@3: 	if(dist_sq > radius * radius) {
nuclear@3: 		return false;
nuclear@3: 	}
nuclear@3: 	return true;
nuclear@3: }
nuclear@3: 
nuclear@3: void Disc::draw() const
nuclear@3: {
nuclear@3: 	Matrix4x4 rot_matrix = calc_rot_matrix();
nuclear@3: 
nuclear@3: 	glMatrixMode(GL_MODELVIEW);
nuclear@3: 	glPushMatrix();
nuclear@3: 	glMultTransposeMatrixf(rot_matrix[0]);
nuclear@3: 
nuclear@3: 	glBegin(GL_TRIANGLE_FAN);
nuclear@3: 	glNormal3f(normal.x, normal.y, normal.z);
nuclear@3: 	glVertex2f(0, 0);
nuclear@3: 	const int segm = 42;
nuclear@3: 	for(int i=0; i<segm; i++) {
nuclear@3: 		float u = (float)i / (float)(segm - 1);
nuclear@3: 		float theta = u * M_PI * 2.0;
nuclear@3: 		float x = cos(theta) * radius;
nuclear@3: 		float y = sin(theta) * radius;
nuclear@3: 		glVertex2f(x, y);
nuclear@3: 	}
nuclear@3: 	glEnd();
nuclear@3: 
nuclear@3: 	glPopMatrix();
nuclear@3: }