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annotate src/app.cc @ 3:bf78387a9925

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pan/zoom, grid snapping
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 17 Dec 2015 07:10:10 +0200
parents ce7aa9a0594c
children 9f75208b81cd
rev   line source
nuclear@0 1 #include <stdlib.h>
nuclear@0 2 #include <float.h>
nuclear@2 3 #include <assert.h>
nuclear@0 4 #include <vector>
nuclear@0 5 #include <algorithm>
nuclear@0 6 #include "opengl.h"
nuclear@0 7 #include "app.h"
nuclear@0 8 #include "curve.h"
nuclear@0 9 #include "widgets.h"
nuclear@0 10
nuclear@3 11 enum SnapMode {
nuclear@3 12 SNAP_NONE,
nuclear@3 13 SNAP_GRID,
nuclear@3 14 SNAP_POINT
nuclear@3 15 };
nuclear@3 16
nuclear@1 17 int win_width, win_height;
nuclear@1 18 float win_aspect;
nuclear@1 19
nuclear@0 20 static void draw_grid(float sz, float sep, float alpha = 1.0f);
nuclear@0 21 static void draw_curve(const Curve *curve);
nuclear@0 22 static void on_click(int bn, float u, float v);
nuclear@0 23
nuclear@2 24 // viewport control
nuclear@2 25 static Vector2 view_pan;
nuclear@3 26 static float view_scale = 0.2f;
nuclear@3 27 static Matrix4x4 view_matrix;
nuclear@3 28
nuclear@3 29 static float grid_size = 1.0;
nuclear@3 30 static SnapMode snap_mode;
nuclear@0 31
nuclear@0 32 static std::vector<Curve*> curves;
nuclear@2 33 static Curve *sel_curve; // selected curve being edited
nuclear@2 34 static Curve *new_curve; // new curve being entered
nuclear@2 35 static Curve *hover_curve; // curve the mouse is hovering over (click to select)
nuclear@2 36 static int sel_pidx = -1; // selected point of the selected or hovered-over curve
nuclear@0 37
nuclear@2 38 static Label *weight_label; // floating label for the cp weight
nuclear@0 39
nuclear@3 40 #ifdef DRAW_MOUSE_POINTER
nuclear@3 41 static Vector2 mouse_pointer;
nuclear@3 42 #endif
nuclear@3 43
nuclear@0 44
nuclear@0 45 bool app_init(int argc, char **argv)
nuclear@0 46 {
nuclear@0 47 glEnable(GL_MULTISAMPLE);
nuclear@0 48 glEnable(GL_CULL_FACE);
nuclear@2 49
nuclear@2 50 glEnable(GL_BLEND);
nuclear@2 51 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
nuclear@0 52 return true;
nuclear@0 53 }
nuclear@0 54
nuclear@0 55 void app_cleanup()
nuclear@0 56 {
nuclear@0 57 for(size_t i=0; i<curves.size(); i++) {
nuclear@0 58 delete curves[i];
nuclear@0 59 }
nuclear@0 60 curves.clear();
nuclear@0 61 }
nuclear@0 62
nuclear@0 63 void app_draw()
nuclear@0 64 {
nuclear@1 65 glClearColor(0.1, 0.1, 0.1, 1);
nuclear@0 66 glClear(GL_COLOR_BUFFER_BIT);
nuclear@0 67
nuclear@0 68 glMatrixMode(GL_MODELVIEW);
nuclear@0 69 glLoadIdentity();
nuclear@3 70 glTranslatef(view_pan.x * view_scale, view_pan.y * view_scale, 0);
nuclear@0 71 glScalef(view_scale, view_scale, view_scale);
nuclear@0 72
nuclear@3 73 float max_aspect = std::max(win_aspect, 1.0f / win_aspect);
nuclear@3 74 draw_grid(max_aspect, grid_size);
nuclear@0 75
nuclear@0 76 for(size_t i=0; i<curves.size(); i++) {
nuclear@0 77 draw_curve(curves[i]);
nuclear@0 78 }
nuclear@0 79 if(new_curve) {
nuclear@0 80 draw_curve(new_curve);
nuclear@0 81 }
nuclear@0 82 if(weight_label) {
nuclear@0 83 weight_label->draw();
nuclear@0 84 }
nuclear@3 85
nuclear@3 86 #ifdef DRAW_MOUSE_POINTER
nuclear@3 87 glPointSize(6.0);
nuclear@3 88 glBegin(GL_POINTS);
nuclear@3 89 glColor3f(0, 0, 1);
nuclear@3 90 glVertex2f(mouse_pointer.x, mouse_pointer.y);
nuclear@3 91 glEnd();
nuclear@3 92 #endif
nuclear@0 93 }
nuclear@0 94
nuclear@0 95 static void draw_grid(float sz, float sep, float alpha)
nuclear@0 96 {
nuclear@0 97 float x = 0.0f;
nuclear@3 98 float s = 1.0 / view_scale;
nuclear@3 99
nuclear@3 100 sz *= s;
nuclear@3 101 sz += sep; // one more step for when we have non-zero fractional pan
nuclear@3 102 float end = std::min(sz, 100.0f * sep);
nuclear@3 103
nuclear@3 104 // fractional pan
nuclear@3 105 Vector2 pan = view_pan;
nuclear@3 106 Vector2 fpan = Vector2(fmod(pan.x, sep), fmod(pan.y, sep));
nuclear@3 107 Vector2 offset = fpan - pan;
nuclear@3 108
nuclear@3 109 glMatrixMode(GL_MODELVIEW);
nuclear@3 110 glPushMatrix();
nuclear@3 111 glTranslatef(offset.x, offset.y, 0);
nuclear@3 112
nuclear@3 113 glBegin(GL_LINES);
nuclear@3 114 glColor4f(0.35, 0.35, 0.35, alpha);
nuclear@3 115 while(x <= end) {
nuclear@3 116 glVertex2f(-end, x);
nuclear@3 117 glVertex2f(end, x);
nuclear@3 118 glVertex2f(-end, -x);
nuclear@3 119 glVertex2f(end, -x);
nuclear@3 120 glVertex2f(x, -end);
nuclear@3 121 glVertex2f(x, end);
nuclear@3 122 glVertex2f(-x, -end);
nuclear@3 123 glVertex2f(-x, end);
nuclear@3 124 x += sep;
nuclear@3 125 }
nuclear@3 126 glEnd();
nuclear@3 127 glPopMatrix();
nuclear@3 128
nuclear@0 129
nuclear@0 130 glLineWidth(1.0);
nuclear@0 131 glBegin(GL_LINES);
nuclear@0 132 glColor4f(0.6, 0.3, 0.2, alpha);
nuclear@3 133 glVertex2f(-sz + offset.x, 0);
nuclear@3 134 glVertex2f(sz + offset.x, 0);
nuclear@0 135 glColor4f(0.2, 0.3, 0.6, alpha);
nuclear@3 136 glVertex2f(0, -sz + offset.y);
nuclear@3 137 glVertex2f(0, sz + offset.y);
nuclear@0 138 glEnd();
nuclear@3 139
nuclear@0 140 }
nuclear@0 141
nuclear@0 142 static void draw_curve(const Curve *curve)
nuclear@0 143 {
nuclear@2 144 int numpt = curve->size();
nuclear@2 145 int segm = numpt * 16;
nuclear@0 146
nuclear@2 147 glLineWidth(curve == hover_curve ? 4.0 : 2.0);
nuclear@1 148 if(curve == sel_curve) {
nuclear@1 149 glColor3f(0.3, 0.4, 1.0);
nuclear@1 150 } else if(curve == new_curve) {
nuclear@1 151 glColor3f(1.0, 0.75, 0.3);
nuclear@1 152 } else {
nuclear@2 153 glColor3f(0.6, 0.6, 0.6);
nuclear@1 154 }
nuclear@0 155 glBegin(GL_LINE_STRIP);
nuclear@0 156 for(int i=0; i<segm; i++) {
nuclear@0 157 float t = (float)i / (float)(segm - 1);
nuclear@0 158 Vector2 v = curve->interpolate(t);
nuclear@0 159 glVertex2f(v.x, v.y);
nuclear@0 160 }
nuclear@0 161 glEnd();
nuclear@0 162 glLineWidth(1.0);
nuclear@0 163
nuclear@2 164 glPointSize(curve == hover_curve ? 10.0 : 7.0);
nuclear@0 165 glBegin(GL_POINTS);
nuclear@1 166 if(curve == new_curve) {
nuclear@1 167 glColor3f(1.0, 0.0, 0.0);
nuclear@1 168 } else {
nuclear@1 169 glColor3f(0.6, 0.3, 0.2);
nuclear@1 170 }
nuclear@0 171 for(int i=0; i<numpt; i++) {
nuclear@1 172 if(curve == sel_curve) {
nuclear@1 173 if(i == sel_pidx) {
nuclear@1 174 glColor3f(1.0, 0.2, 0.1);
nuclear@1 175 } else {
nuclear@1 176 glColor3f(0.2, 1.0, 0.2);
nuclear@1 177 }
nuclear@1 178 }
nuclear@0 179 Vector2 pt = curve->get_point(i);
nuclear@0 180 glVertex2f(pt.x, pt.y);
nuclear@0 181 }
nuclear@0 182 glEnd();
nuclear@0 183 glPointSize(1.0);
nuclear@0 184 }
nuclear@0 185
nuclear@0 186 void app_reshape(int x, int y)
nuclear@0 187 {
nuclear@0 188 win_width = x;
nuclear@0 189 win_height = y;
nuclear@0 190 win_aspect = (float)x / (float)y;
nuclear@0 191
nuclear@0 192 glViewport(0, 0, x, y);
nuclear@0 193 glMatrixMode(GL_PROJECTION);
nuclear@0 194 glLoadIdentity();
nuclear@0 195 glOrtho(-win_aspect, win_aspect, -1, 1, -1, 1);
nuclear@0 196 }
nuclear@0 197
nuclear@0 198 void app_keyboard(int key, bool pressed)
nuclear@0 199 {
nuclear@0 200 if(pressed) {
nuclear@0 201 switch(key) {
nuclear@1 202 case 'q':
nuclear@1 203 case 'Q':
nuclear@1 204 exit(0);
nuclear@1 205
nuclear@0 206 case 27:
nuclear@1 207 if(new_curve) {
nuclear@1 208 delete new_curve;
nuclear@1 209 new_curve = 0;
nuclear@1 210 post_redisplay();
nuclear@1 211 }
nuclear@1 212 break;
nuclear@0 213
nuclear@0 214 case 'l':
nuclear@0 215 case 'L':
nuclear@0 216 if(sel_curve) {
nuclear@0 217 sel_curve->set_type(CURVE_LINEAR);
nuclear@0 218 post_redisplay();
nuclear@0 219 }
nuclear@1 220 if(new_curve) {
nuclear@1 221 new_curve->set_type(CURVE_LINEAR);
nuclear@1 222 post_redisplay();
nuclear@1 223 }
nuclear@0 224 break;
nuclear@0 225
nuclear@0 226 case 'b':
nuclear@0 227 case 'B':
nuclear@0 228 if(sel_curve) {
nuclear@0 229 sel_curve->set_type(CURVE_BSPLINE);
nuclear@0 230 post_redisplay();
nuclear@0 231 }
nuclear@1 232 if(new_curve) {
nuclear@1 233 new_curve->set_type(CURVE_BSPLINE);
nuclear@1 234 post_redisplay();
nuclear@1 235 }
nuclear@0 236 break;
nuclear@0 237
nuclear@0 238 case 'h':
nuclear@0 239 case 'H':
nuclear@0 240 if(sel_curve) {
nuclear@0 241 sel_curve->set_type(CURVE_HERMITE);
nuclear@0 242 post_redisplay();
nuclear@0 243 }
nuclear@1 244 if(new_curve) {
nuclear@1 245 new_curve->set_type(CURVE_HERMITE);
nuclear@1 246 post_redisplay();
nuclear@1 247 }
nuclear@0 248 break;
nuclear@0 249 }
nuclear@0 250 }
nuclear@3 251
nuclear@3 252
nuclear@3 253 switch(key) {
nuclear@3 254 case 's':
nuclear@3 255 snap_mode = pressed ? SNAP_GRID : SNAP_NONE;
nuclear@3 256 break;
nuclear@3 257
nuclear@3 258 case 'S':
nuclear@3 259 snap_mode = pressed ? SNAP_POINT : SNAP_NONE;
nuclear@3 260 break;
nuclear@3 261
nuclear@3 262 default:
nuclear@3 263 break;
nuclear@3 264 }
nuclear@3 265 }
nuclear@3 266
nuclear@3 267 static void calc_view_matrix()
nuclear@3 268 {
nuclear@3 269 view_matrix.reset_identity();
nuclear@3 270 view_matrix.scale(Vector3(view_scale, view_scale, view_scale));
nuclear@3 271 view_matrix.translate(Vector3(view_pan.x, view_pan.y, 0.0));
nuclear@0 272 }
nuclear@0 273
nuclear@0 274 static Vector2 pixel_to_uv(int x, int y)
nuclear@0 275 {
nuclear@0 276 float u = win_aspect * (2.0 * (float)x / (float)win_width - 1.0);
nuclear@0 277 float v = 1.0 - 2.0 * (float)y / (float)win_height;
nuclear@3 278
nuclear@3 279 u = u / view_scale - view_pan.x;
nuclear@3 280 v = v / view_scale - view_pan.y;
nuclear@0 281 return Vector2(u, v);
nuclear@3 282 /*
nuclear@3 283 Matrix4x4 inv_view_matrix = view_matrix.inverse();
nuclear@3 284 Vector4 res = Vector4(u, v, 0.0, 1.0).transformed(inv_view_matrix);
nuclear@3 285
nuclear@3 286 return Vector2(res.x, res.y);
nuclear@3 287 */
nuclear@0 288 }
nuclear@0 289
nuclear@0 290 static int prev_x, prev_y;
nuclear@0 291 static int click_pos[8][2];
nuclear@0 292 static unsigned int bnstate;
nuclear@0 293
nuclear@0 294 #define BNBIT(x) (1 << (x))
nuclear@0 295
nuclear@0 296 void app_mouse_button(int bn, bool pressed, int x, int y)
nuclear@0 297 {
nuclear@0 298 prev_x = x;
nuclear@0 299 prev_y = y;
nuclear@0 300 if(pressed) {
nuclear@0 301 bnstate |= BNBIT(bn);
nuclear@0 302 } else {
nuclear@0 303 bnstate &= ~BNBIT(bn);
nuclear@0 304 }
nuclear@0 305
nuclear@0 306 if(pressed) {
nuclear@0 307 click_pos[bn][0] = x;
nuclear@0 308 click_pos[bn][1] = y;
nuclear@0 309 } else {
nuclear@0 310 int dx = x - click_pos[bn][0];
nuclear@0 311 int dy = y - click_pos[bn][1];
nuclear@0 312
nuclear@0 313 if(abs(dx) + abs(dy) < 3) {
nuclear@0 314 Vector2 uv = pixel_to_uv(x, y);
nuclear@0 315 on_click(bn, uv.x, uv.y);
nuclear@0 316 }
nuclear@0 317
nuclear@0 318 if(!(bnstate & BNBIT(2))) {
nuclear@0 319 delete weight_label;
nuclear@0 320 weight_label = 0;
nuclear@0 321 post_redisplay();
nuclear@0 322 }
nuclear@0 323 }
nuclear@0 324 }
nuclear@0 325
nuclear@2 326 static bool point_hit_test(const Vector2 &pos, Curve **curveret, int *pidxret)
nuclear@0 327 {
nuclear@3 328 float thres = 0.02 / view_scale;
nuclear@0 329
nuclear@0 330 for(size_t i=0; i<curves.size(); i++) {
nuclear@2 331 int pidx = curves[i]->nearest_point(pos);
nuclear@0 332 if(pidx == -1) continue;
nuclear@0 333
nuclear@0 334 Vector2 cp = curves[i]->get_point(pidx);
nuclear@2 335 if((cp - pos).length_sq() < thres * thres) {
nuclear@2 336 *curveret = curves[i];
nuclear@2 337 *pidxret = pidx;
nuclear@2 338 return true;
nuclear@0 339 }
nuclear@0 340 }
nuclear@2 341 *curveret = 0;
nuclear@2 342 *pidxret = -1;
nuclear@2 343 return false;
nuclear@0 344 }
nuclear@0 345
nuclear@3 346 static Vector2 snap(const Vector2 &p)
nuclear@3 347 {
nuclear@3 348 switch(snap_mode) {
nuclear@3 349 case SNAP_GRID:
nuclear@3 350 return Vector2(round(p.x / grid_size) * grid_size, round(p.y / grid_size) * grid_size);
nuclear@3 351 case SNAP_POINT:
nuclear@3 352 // TODO
nuclear@3 353 default:
nuclear@3 354 break;
nuclear@3 355 }
nuclear@3 356 return p;
nuclear@3 357 }
nuclear@3 358
nuclear@0 359 void app_mouse_motion(int x, int y)
nuclear@0 360 {
nuclear@3 361 Vector2 prev_uv = pixel_to_uv(prev_x, prev_y);
nuclear@3 362
nuclear@0 363 int dx = x - prev_x;
nuclear@0 364 int dy = y - prev_y;
nuclear@0 365 prev_x = x;
nuclear@0 366 prev_y = y;
nuclear@0 367
nuclear@0 368 if(!dx && !dy) return;
nuclear@0 369
nuclear@2 370 Vector2 uv = pixel_to_uv(x, y);
nuclear@3 371 #ifdef DRAW_MOUSE_POINTER
nuclear@3 372 mouse_pointer = uv;
nuclear@3 373 post_redisplay();
nuclear@3 374 #endif
nuclear@2 375
nuclear@2 376 /* when entering a new curve, have the last (extra) point following
nuclear@2 377 * the mouse until it's entered by a click (see on_click).
nuclear@2 378 */
nuclear@3 379 if(new_curve) {
nuclear@3 380 new_curve->move_point(new_curve->size() - 1, snap(uv));
nuclear@2 381 post_redisplay();
nuclear@3 382 return;
nuclear@2 383 }
nuclear@3 384 // from this point on we're definitely not in new-curve mode
nuclear@2 385
nuclear@3 386 if(!bnstate) {
nuclear@3 387 // not dragging, highlight curve under mouse
nuclear@2 388 point_hit_test(uv, &hover_curve, &sel_pidx);
nuclear@0 389 post_redisplay();
nuclear@0 390
nuclear@3 391 } else {
nuclear@3 392 // we're dragging with one or more buttons held down
nuclear@0 393
nuclear@3 394 if(sel_curve && sel_pidx != -1) {
nuclear@3 395 // we have a curve and a point of the curve selected
nuclear@0 396
nuclear@3 397 if(bnstate & BNBIT(0)) {
nuclear@3 398 // dragging point with left button: move it
nuclear@3 399 sel_curve->move_point(sel_pidx, snap(uv));
nuclear@3 400 post_redisplay();
nuclear@0 401 }
nuclear@3 402
nuclear@3 403 if(bnstate & BNBIT(2)) {
nuclear@3 404 // dragging point with right button: change weight
nuclear@3 405 float w = sel_curve->get_weight(sel_pidx);
nuclear@3 406 w -= dy * 0.01;
nuclear@3 407 if(w < FLT_MIN) w = FLT_MIN;
nuclear@3 408 sel_curve->set_weight(sel_pidx, w);
nuclear@3 409
nuclear@3 410 // popup floating weight label if not already there
nuclear@3 411 if(!weight_label) {
nuclear@3 412 weight_label = new Label;
nuclear@3 413 }
nuclear@3 414 weight_label->set_position(uv);
nuclear@3 415 weight_label->set_textf("w=%g", w);
nuclear@3 416 post_redisplay();
nuclear@3 417 }
nuclear@3 418 } else {
nuclear@3 419 // no selection, we're dragging in empty space: manipulate viewport
nuclear@3 420 Vector2 dir = uv - prev_uv;
nuclear@3 421
nuclear@3 422 if(bnstate & (BNBIT(0) | BNBIT(1))) {
nuclear@3 423 // panning
nuclear@3 424 view_pan += dir;
nuclear@3 425 calc_view_matrix();
nuclear@3 426 post_redisplay();
nuclear@3 427 }
nuclear@3 428 if(bnstate & BNBIT(2)) {
nuclear@3 429 // zooming
nuclear@3 430 view_scale -= ((float)dy / (float)win_height) * view_scale * 5.0;
nuclear@3 431 if(view_scale < 1e-4) view_scale = 1e-4;
nuclear@3 432 calc_view_matrix();
nuclear@3 433 post_redisplay();
nuclear@3 434 }
nuclear@0 435 }
nuclear@0 436 }
nuclear@0 437 }
nuclear@0 438
nuclear@0 439 static void on_click(int bn, float u, float v)
nuclear@0 440 {
nuclear@2 441 Vector2 uv = Vector2(u, v);
nuclear@2 442
nuclear@0 443 switch(bn) {
nuclear@2 444 case 0: // ------- LEFT CLICK ------
nuclear@2 445 if(hover_curve) {
nuclear@2 446 // if we're hovering: click selects
nuclear@2 447 sel_curve = hover_curve;
nuclear@2 448 hover_curve = 0;
nuclear@2 449 } else if(sel_curve) {
nuclear@2 450 // if we have a selected curve: click adds point (enter new_curve mode)
nuclear@2 451 std::vector<Curve*>::iterator it = std::find(curves.begin(), curves.end(), sel_curve);
nuclear@2 452 assert(it != curves.end());
nuclear@2 453 curves.erase(it, it + 1);
nuclear@2 454
nuclear@2 455 new_curve = sel_curve;
nuclear@2 456 sel_curve = 0;
nuclear@2 457 sel_pidx = -1;
nuclear@2 458
nuclear@2 459 new_curve->add_point(uv);
nuclear@2 460 } else {
nuclear@2 461 // otherwise, click starts a new curve
nuclear@2 462 if(!new_curve) {
nuclear@2 463 new_curve = new Curve;
nuclear@2 464 new_curve->add_point(uv);
nuclear@2 465 }
nuclear@2 466 new_curve->add_point(uv);
nuclear@0 467 }
nuclear@0 468 post_redisplay();
nuclear@0 469 break;
nuclear@0 470
nuclear@2 471 case 2: // ------- RIGHT CLICK ------
nuclear@2 472 if(new_curve) {
nuclear@2 473 // in new-curve mode: finish curve (cancels last floating segment)
nuclear@2 474 new_curve->remove_point(new_curve->size() - 1);
nuclear@2 475 if(new_curve->empty()) {
nuclear@2 476 delete new_curve;
nuclear@2 477 } else {
nuclear@2 478 curves.push_back(new_curve);
nuclear@2 479 }
nuclear@2 480 new_curve = 0;
nuclear@2 481
nuclear@2 482 } else if(sel_curve) {
nuclear@2 483 // in selected curve mode: delete control point or unselect
nuclear@2 484 Curve *hit_curve;
nuclear@2 485 int hit_pidx;
nuclear@2 486 if(point_hit_test(uv, &hit_curve, &hit_pidx) && hit_curve == sel_curve) {
nuclear@2 487 hit_curve->remove_point(hit_pidx);
nuclear@2 488 sel_pidx = -1;
nuclear@2 489 } else {
nuclear@2 490 sel_curve = 0;
nuclear@2 491 sel_pidx = -1;
nuclear@2 492 }
nuclear@2 493 }
nuclear@0 494 post_redisplay();
nuclear@0 495 break;
nuclear@0 496
nuclear@0 497 default:
nuclear@0 498 break;
nuclear@0 499 }
nuclear@0 500 }