nuclear@6: #include <algorithm>
nuclear@6: #include "opengl.h"
nuclear@6: #include "dragon.h"
nuclear@6: 
nuclear@6: Dragon::Dragon()
nuclear@6: 	: pos(0, 0, 0), dir(0, 0, -1), head_pos(0, 0, -1), target(0, 0, -2)
nuclear@6: {
nuclear@6: 	set_head_limits(-1, 1, -1, 1);
nuclear@6: }
nuclear@6: 
nuclear@6: Dragon::~Dragon()
nuclear@6: {
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::set_position(const Vector3 &p)
nuclear@6: {
nuclear@6: 	pos = p;
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::set_direction(const Vector3 &dir)
nuclear@6: {
nuclear@6: 	this->dir = dir.normalized();
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::set_target(const Vector3 &p)
nuclear@6: {
nuclear@6: 	target = p;
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::set_head_limits(float xmin, float xmax, float ymin, float ymax)
nuclear@6: {
nuclear@6: 	head_xlim[0] = std::min(xmin, xmax);
nuclear@6: 	head_xlim[1] = std::max(xmin, xmax);
nuclear@6: 	head_ylim[0] = std::min(ymin, ymax);
nuclear@6: 	head_ylim[1] = std::max(ymin, ymax);
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::move_head(const Vector3 &p)
nuclear@6: {
nuclear@6: 	head_pos = p;
nuclear@6: }
nuclear@6: 
nuclear@6: static float clamp(float x, float low, float high)
nuclear@6: {
nuclear@6: 	return x < low ? low : (x > high ? high : x);
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::move_head(float dx, float dy)
nuclear@6: {
nuclear@6: 	float newx = clamp(head_pos.x + dx, head_xlim[0], head_xlim[1]);
nuclear@6: 	float newy = clamp(head_pos.y + dy, head_ylim[0], head_ylim[1]);
nuclear@6: 
nuclear@6: 	dx = newx - head_pos.x;
nuclear@6: 	dy = newy - head_pos.y;
nuclear@6: 	head_pos.x = newx;
nuclear@6: 	head_pos.y = newy;
nuclear@6: 
nuclear@6: 	target.x += dx * 0.7;
nuclear@6: 	target.y += dy * 0.5;
nuclear@6: }
nuclear@6: 
nuclear@6: const Vector3 &Dragon::head_position() const
nuclear@6: {
nuclear@6: 	return head_pos;
nuclear@6: }
nuclear@6: 
nuclear@6: Vector3 Dragon::breath_dir() const
nuclear@6: {
nuclear@6: 	return (target - head_pos).normalized();
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::update()
nuclear@6: {
nuclear@6: }
nuclear@6: 
nuclear@6: static Vector3 bezier(const Vector3 &a, const Vector3 &b, const Vector3 &c, const Vector3 &d, float t)
nuclear@6: {
nuclear@6: 	float x = bezier(a.x, b.x, c.x, d.x, t);
nuclear@6: 	float y = bezier(a.y, b.y, c.y, d.y, t);
nuclear@6: 	float z = bezier(a.z, b.z, c.z, d.z, t);
nuclear@6: 	return Vector3(x, y, z);
nuclear@6: }
nuclear@6: 
nuclear@6: void Dragon::draw() const
nuclear@6: {
nuclear@6: 	Vector3 bdir = breath_dir();
nuclear@6: 	Vector3 bezcp[] = { pos, pos + dir * 6.0, head_pos - bdir * 8.0, head_pos };
nuclear@6: 
nuclear@6: 	int cur_sdr;
nuclear@6: 	glGetIntegerv(GL_CURRENT_PROGRAM, &cur_sdr);
nuclear@6: 	glUseProgram(0);
nuclear@6: 
nuclear@6: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@6: 	glDisable(GL_LIGHTING);
nuclear@6: 
nuclear@6: 	glLineWidth(2.0);
nuclear@6: 	glColor3f(0, 0, 1);
nuclear@6: 
nuclear@6: 	glBegin(GL_LINE_STRIP);
nuclear@6: 	for(int i=0; i<10; i++) {
nuclear@6: 		float t = (float)i / 10.0f;
nuclear@6: 		Vector3 p = bezier(bezcp[0], bezcp[1], bezcp[2], bezcp[3], t);
nuclear@6: 		glVertex3f(p.x, p.y, p.z);
nuclear@6: 	}
nuclear@6: 	glEnd();
nuclear@6: 	glLineWidth(1);
nuclear@6: 
nuclear@6: 	glPointSize(5.0);
nuclear@6: 	glColor3f(0, 1, 0);
nuclear@6: 
nuclear@6: 	glBegin(GL_POINTS);
nuclear@6: 	for(int i=0; i<4; i++) {
nuclear@6: 		glVertex3f(bezcp[i].x, bezcp[i].y, bezcp[i].z);
nuclear@6: 	}
nuclear@6: 	glEnd();
nuclear@6: 
nuclear@6: 	glPopAttrib();
nuclear@6: 
nuclear@6: 	glUseProgram(cur_sdr);
nuclear@6: }