nuclear@0: #include <stdlib.h>
nuclear@0: #include <float.h>
nuclear@0: #include <vector>
nuclear@0: #include <algorithm>
nuclear@0: #include "opengl.h"
nuclear@0: #include "app.h"
nuclear@0: #include "curve.h"
nuclear@0: #include "widgets.h"
nuclear@0: 
nuclear@0: static void draw_grid(float sz, float sep, float alpha = 1.0f);
nuclear@0: static void draw_curve(const Curve *curve);
nuclear@0: static void on_click(int bn, float u, float v);
nuclear@0: 
nuclear@0: static int win_width, win_height;
nuclear@0: static float win_aspect;
nuclear@0: 
nuclear@0: static float view_pan_x, view_pan_y;
nuclear@0: static float view_scale = 1.0f;
nuclear@0: 
nuclear@0: static std::vector<Curve*> curves;
nuclear@0: static Curve *sel_curve, *new_curve;
nuclear@0: static int sel_pidx = -1;
nuclear@0: 
nuclear@0: static Label *weight_label;
nuclear@0: 
nuclear@0: 
nuclear@0: bool app_init(int argc, char **argv)
nuclear@0: {
nuclear@0: 	glEnable(GL_MULTISAMPLE);
nuclear@0: 	glEnable(GL_CULL_FACE);
nuclear@0: 	return true;
nuclear@0: }
nuclear@0: 
nuclear@0: void app_cleanup()
nuclear@0: {
nuclear@0: 	for(size_t i=0; i<curves.size(); i++) {
nuclear@0: 		delete curves[i];
nuclear@0: 	}
nuclear@0: 	curves.clear();
nuclear@0: }
nuclear@0: 
nuclear@0: void app_draw()
nuclear@0: {
nuclear@0: 	glClearColor(0.16, 0.16, 0.16, 1);
nuclear@0: 	glClear(GL_COLOR_BUFFER_BIT);
nuclear@0: 
nuclear@0: 	glMatrixMode(GL_MODELVIEW);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	glTranslatef(-view_pan_x, -view_pan_y, 0);
nuclear@0: 	glScalef(view_scale, view_scale, view_scale);
nuclear@0: 
nuclear@0: 	draw_grid(std::max(win_aspect, 1.0f / win_aspect), 0.1);
nuclear@0: 
nuclear@0: 	for(size_t i=0; i<curves.size(); i++) {
nuclear@0: 		draw_curve(curves[i]);
nuclear@0: 	}
nuclear@0: 	if(new_curve) {
nuclear@0: 		// TODO special drawing with more feedback
nuclear@0: 		draw_curve(new_curve);
nuclear@0: 	}
nuclear@0: 	if(weight_label) {
nuclear@0: 		weight_label->draw();
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static void draw_grid(float sz, float sep, float alpha)
nuclear@0: {
nuclear@0: 	float x = 0.0f;
nuclear@0: 
nuclear@0: 	glLineWidth(1.0);
nuclear@0: 	glBegin(GL_LINES);
nuclear@0: 	glColor4f(0.6, 0.3, 0.2, alpha);
nuclear@0: 	glVertex2f(-sz, 0);
nuclear@0: 	glVertex2f(sz, 0);
nuclear@0: 	glColor4f(0.2, 0.3, 0.6, alpha);
nuclear@0: 	glVertex2f(0, -sz);
nuclear@0: 	glVertex2f(0, sz);
nuclear@0: 	glColor4f(0.4, 0.4, 0.4, alpha);
nuclear@0: 	while(x < sz) {
nuclear@0: 		x += sep;
nuclear@0: 		glVertex2f(-sz, x);
nuclear@0: 		glVertex2f(sz, x);
nuclear@0: 		glVertex2f(-sz, -x);
nuclear@0: 		glVertex2f(sz, -x);
nuclear@0: 		glVertex2f(x, -sz);
nuclear@0: 		glVertex2f(x, sz);
nuclear@0: 		glVertex2f(-x, -sz);
nuclear@0: 		glVertex2f(-x, sz);
nuclear@0: 	}
nuclear@0: 	glEnd();
nuclear@0: }
nuclear@0: 
nuclear@0: static void draw_curve(const Curve *curve)
nuclear@0: {
nuclear@0: 	int numpt = curve->get_point_count();
nuclear@0: 	int segm = numpt * 16.0f;
nuclear@0: 
nuclear@0: 	glBegin(GL_LINE_STRIP);
nuclear@0: 	if(curve == sel_curve) {
nuclear@0: 		glLineWidth(3.0);
nuclear@0: 		glColor3f(0.2, 0.8, 0.3);
nuclear@0: 	} else {
nuclear@0: 		glLineWidth(2.0);
nuclear@0: 		glColor3f(0.8, 0.75, 0.3);
nuclear@0: 	}
nuclear@0: 	for(int i=0; i<segm; i++) {
nuclear@0: 		float t = (float)i / (float)(segm - 1);
nuclear@0: 		Vector2 v = curve->interpolate(t);
nuclear@0: 		glVertex2f(v.x, v.y);
nuclear@0: 	}
nuclear@0: 	glEnd();
nuclear@0: 	glLineWidth(1.0);
nuclear@0: 
nuclear@0: 	glPointSize(5.0);
nuclear@0: 	glBegin(GL_POINTS);
nuclear@0: 	glColor3f(1.0, 0.5, 0.2);
nuclear@0: 	for(int i=0; i<numpt; i++) {
nuclear@0: 		Vector2 pt = curve->get_point(i);
nuclear@0: 		glVertex2f(pt.x, pt.y);
nuclear@0: 	}
nuclear@0: 	glEnd();
nuclear@0: 	glPointSize(1.0);
nuclear@0: }
nuclear@0: 
nuclear@0: void app_reshape(int x, int y)
nuclear@0: {
nuclear@0: 	win_width = x;
nuclear@0: 	win_height = y;
nuclear@0: 	win_aspect = (float)x / (float)y;
nuclear@0: 
nuclear@0: 	glViewport(0, 0, x, y);
nuclear@0: 	glMatrixMode(GL_PROJECTION);
nuclear@0: 	glLoadIdentity();
nuclear@0: 	glOrtho(-win_aspect, win_aspect, -1, 1, -1, 1);
nuclear@0: }
nuclear@0: 
nuclear@0: void app_keyboard(int key, bool pressed)
nuclear@0: {
nuclear@0: 	if(pressed) {
nuclear@0: 		switch(key) {
nuclear@0: 		case 27:
nuclear@0: 			exit(0);
nuclear@0: 
nuclear@0: 		case 'l':
nuclear@0: 		case 'L':
nuclear@0: 			if(sel_curve) {
nuclear@0: 				sel_curve->set_type(CURVE_LINEAR);
nuclear@0: 				post_redisplay();
nuclear@0: 			}
nuclear@0: 			break;
nuclear@0: 
nuclear@0: 		case 'b':
nuclear@0: 		case 'B':
nuclear@0: 			if(sel_curve) {
nuclear@0: 				sel_curve->set_type(CURVE_BSPLINE);
nuclear@0: 				post_redisplay();
nuclear@0: 			}
nuclear@0: 			break;
nuclear@0: 
nuclear@0: 		case 'h':
nuclear@0: 		case 'H':
nuclear@0: 			if(sel_curve) {
nuclear@0: 				sel_curve->set_type(CURVE_HERMITE);
nuclear@0: 				post_redisplay();
nuclear@0: 			}
nuclear@0: 			break;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static Vector2 pixel_to_uv(int x, int y)
nuclear@0: {
nuclear@0: 	float u = win_aspect * (2.0 * (float)x / (float)win_width - 1.0);
nuclear@0: 	float v = 1.0 - 2.0 * (float)y / (float)win_height;
nuclear@0: 	return Vector2(u, v);
nuclear@0: }
nuclear@0: 
nuclear@0: static int prev_x, prev_y;
nuclear@0: static int click_pos[8][2];
nuclear@0: static unsigned int bnstate;
nuclear@0: 
nuclear@0: #define BNBIT(x)	(1 << (x))
nuclear@0: 
nuclear@0: void app_mouse_button(int bn, bool pressed, int x, int y)
nuclear@0: {
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: 	if(pressed) {
nuclear@0: 		bnstate |= BNBIT(bn);
nuclear@0: 	} else {
nuclear@0: 		bnstate &= ~BNBIT(bn);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(pressed) {
nuclear@0: 		click_pos[bn][0] = x;
nuclear@0: 		click_pos[bn][1] = y;
nuclear@0: 	} else {
nuclear@0: 		int dx = x - click_pos[bn][0];
nuclear@0: 		int dy = y - click_pos[bn][1];
nuclear@0: 
nuclear@0: 		if(abs(dx) + abs(dy) < 3) {
nuclear@0: 			Vector2 uv = pixel_to_uv(x, y);
nuclear@0: 			on_click(bn, uv.x, uv.y);
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		if(!(bnstate & BNBIT(2))) {
nuclear@0: 			delete weight_label;
nuclear@0: 			weight_label = 0;
nuclear@0: 			post_redisplay();
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static void hover(int x, int y)
nuclear@0: {
nuclear@0: 	float thres = pixel_to_uv(5, 0).x - pixel_to_uv(0, 0).x;
nuclear@0: 
nuclear@0: 	Vector2 uv = pixel_to_uv(x, y);
nuclear@0: 	for(size_t i=0; i<curves.size(); i++) {
nuclear@0: 		int pidx = curves[i]->nearest_point(uv);
nuclear@0: 		if(pidx == -1) continue;
nuclear@0: 
nuclear@0: 		Vector2 cp = curves[i]->get_point(pidx);
nuclear@0: 		if((cp - uv).length_sq() < thres * thres) {
nuclear@0: 			sel_curve = curves[i];
nuclear@0: 			sel_pidx = pidx;
nuclear@0: 			return;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	sel_curve = 0;
nuclear@0: 	sel_pidx = -1;
nuclear@0: }
nuclear@0: 
nuclear@0: void app_mouse_motion(int x, int y)
nuclear@0: {
nuclear@0: 	int dx = x - prev_x;
nuclear@0: 	int dy = y - prev_y;
nuclear@0: 	prev_x = x;
nuclear@0: 	prev_y = y;
nuclear@0: 
nuclear@0: 	if(!dx && !dy) return;
nuclear@0: 
nuclear@0: 	if(!new_curve && !bnstate) {
nuclear@0: 		hover(x, y);
nuclear@0: 		post_redisplay();
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(sel_curve && sel_pidx != -1) {
nuclear@0: 		if(bnstate & BNBIT(0)) {
nuclear@0: 			float w = sel_curve->get_weight(sel_pidx);
nuclear@0: 			sel_curve->set_point(sel_pidx, pixel_to_uv(x, y), w);
nuclear@0: 			post_redisplay();
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		if(bnstate & BNBIT(2)) {
nuclear@0: 			float w = sel_curve->get_weight(sel_pidx);
nuclear@0: 			w -= dy * 0.1;
nuclear@0: 			if(w < FLT_MIN) w = FLT_MIN;
nuclear@0: 			sel_curve->set_weight(sel_pidx, w);
nuclear@0: 
nuclear@0: 			if(!weight_label) {
nuclear@0: 				weight_label = new Label;
nuclear@0: 			}
nuclear@0: 			weight_label->set_position(pixel_to_uv(x, y));
nuclear@0: 			weight_label->set_textf("w=%g", w);
nuclear@0: 			post_redisplay();
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: static void on_click(int bn, float u, float v)
nuclear@0: {
nuclear@0: 	switch(bn) {
nuclear@0: 	case 0:
nuclear@0: 		if(!new_curve) {
nuclear@0: 			new_curve = new Curve;
nuclear@0: 		}
nuclear@0: 		new_curve->add_point(Vector2(u, v));
nuclear@0: 		post_redisplay();
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 2:
nuclear@0: 		curves.push_back(new_curve);
nuclear@0: 		new_curve = 0;
nuclear@0: 		post_redisplay();
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	default:
nuclear@0: 		break;
nuclear@0: 	}
nuclear@0: }