curvedraw: c2008ba88d03 src/app.cc

curvedraw

view src/app.cc @ 9:c2008ba88d03

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 19 Dec 2015 08:00:53 +0200
parents	2b7ae76c173f
children	95fada20c638

line source

1 #include <stdlib.h>

2 #include <float.h>

3 #include <assert.h>

4 #include <vector>

5 #include <algorithm>

6 #include "opengl.h"

7 #include "app.h"

8 #include "curve.h"

9 #include "widgets.h"

10 #include "curvefile.h"

12 enum SnapMode {

13 SNAP_NONE,

14 SNAP_GRID,

15 SNAP_POINT

16 };

18 int win_width, win_height;

19 float win_aspect;

21 static void draw_grid(float sz, float sep, float alpha = 1.0f);

22 static void draw_curve(const Curve *curve);

23 static void on_click(int bn, float u, float v);

25 // viewport control

26 static Vector2 view_pan;

27 static float view_scale = 0.2f;

28 static Matrix4x4 view_matrix;

30 static float grid_size = 1.0;

31 static SnapMode snap_mode;

33 static std::vector<Curve*> curves;

34 static Curve *sel_curve; // selected curve being edited

35 static Curve *new_curve; // new curve being entered

36 static Curve *hover_curve; // curve the mouse is hovering over (click to select)

37 static int sel_pidx = -1; // selected point of the selected or hovered-over curve

39 static Label *weight_label; // floating label for the cp weight

41 #ifdef DRAW_MOUSE_POINTER

42 static Vector2 mouse_pointer;

43 #endif

46 bool app_init(int argc, char **argv)

47 {

48 glewInit();

50 glEnable(GL_MULTISAMPLE);

51 glEnable(GL_CULL_FACE);

53 glEnable(GL_BLEND);

54 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

55 return true;

56 }

58 void app_cleanup()

59 {

60 for(size_t i=0; i<curves.size(); i++) {

61 delete curves[i];

62 }

63 curves.clear();

64 }

66 void app_draw()

67 {

68 glClearColor(0.1, 0.1, 0.1, 1);

69 glClear(GL_COLOR_BUFFER_BIT);

71 glMatrixMode(GL_MODELVIEW);

72 glLoadIdentity();

73 glTranslatef(view_pan.x * view_scale, view_pan.y * view_scale, 0);

74 glScalef(view_scale, view_scale, view_scale);

76 float max_aspect = std::max(win_aspect, 1.0f / win_aspect);

77 draw_grid(max_aspect, grid_size);

79 for(size_t i=0; i<curves.size(); i++) {

80 draw_curve(curves[i]);

81 }

82 if(new_curve) {

83 draw_curve(new_curve);

84 }

86 #ifdef DRAW_MOUSE_POINTER

87 glPointSize(6.0);

88 glBegin(GL_POINTS);

89 glColor3f(0, 0, 1);

90 glVertex2f(mouse_pointer.x, mouse_pointer.y);

91 glEnd();

92 #endif

94 glMatrixMode(GL_MODELVIEW);

95 glLoadIdentity();

97 if(weight_label) {

98 weight_label->draw();

99 }

100 }

101

102 static void draw_grid(float sz, float sep, float alpha)

103 {

104 float x = 0.0f;

105 float s = 1.0 / view_scale;

106

107 sz *= s;

108 sz += sep; // one more step for when we have non-zero fractional pan

109 float end = std::min(sz, 100.0f * sep);

110

111 // fractional pan

112 Vector2 pan = view_pan;

113 Vector2 fpan = Vector2(fmod(pan.x, sep), fmod(pan.y, sep));

114 Vector2 offset = fpan - pan;

115

116 glMatrixMode(GL_MODELVIEW);

117 glPushMatrix();

118 glTranslatef(offset.x, offset.y, 0);

119

120 glBegin(GL_LINES);

121 glColor4f(0.35, 0.35, 0.35, alpha);

122 while(x <= end) {

123 glVertex2f(-end, x);

124 glVertex2f(end, x);

125 glVertex2f(-end, -x);

126 glVertex2f(end, -x);

127 glVertex2f(x, -end);

128 glVertex2f(x, end);

129 glVertex2f(-x, -end);

130 glVertex2f(-x, end);

131 x += sep;

132 }

133 glEnd();

134 glPopMatrix();

135

136

137 glLineWidth(1.0);

138 glBegin(GL_LINES);

139 glColor4f(0.6, 0.3, 0.2, alpha);

140 glVertex2f(-sz + offset.x, 0);

141 glVertex2f(sz + offset.x, 0);

142 glColor4f(0.2, 0.3, 0.6, alpha);

143 glVertex2f(0, -sz + offset.y);

144 glVertex2f(0, sz + offset.y);

145 glEnd();

146

147 }

148

149 static void draw_curve(const Curve *curve)

150 {

151 int numpt = curve->size();

152 int segm = numpt * 16;

153

154 glLineWidth(curve == hover_curve ? 4.0 : 2.0);

155 if(curve == sel_curve) {

156 glColor3f(0.3, 0.4, 1.0);

157 } else if(curve == new_curve) {

158 glColor3f(1.0, 0.75, 0.3);

159 } else {

160 glColor3f(0.6, 0.6, 0.6);

161 }

162 glBegin(GL_LINE_STRIP);

163 for(int i=0; i<segm; i++) {

164 float t = (float)i / (float)(segm - 1);

165 Vector2 v = curve->interpolate(t);

166 glVertex2f(v.x, v.y);

167 }

168 glEnd();

169 glLineWidth(1.0);

170

171 glPointSize(curve == hover_curve ? 10.0 : 7.0);

172 glBegin(GL_POINTS);

173 if(curve == new_curve) {

174 glColor3f(1.0, 0.0, 0.0);

175 } else {

176 glColor3f(0.6, 0.3, 0.2);

177 }

178 for(int i=0; i<numpt; i++) {

179 if(curve == sel_curve) {

180 if(i == sel_pidx) {

181 glColor3f(1.0, 0.2, 0.1);

182 } else {

183 glColor3f(0.2, 1.0, 0.2);

184 }

185 }

186 Vector2 pt = curve->get_point(i);

187 glVertex2f(pt.x, pt.y);

188 }

189 glEnd();

190 glPointSize(1.0);

191 }

192

193 void app_reshape(int x, int y)

194 {

195 win_width = x;

196 win_height = y;

197 win_aspect = (float)x / (float)y;

198

199 glViewport(0, 0, x, y);

200 glMatrixMode(GL_PROJECTION);

201 glLoadIdentity();

202 glOrtho(-win_aspect, win_aspect, -1, 1, -1, 1);

203 }

204

205 void app_keyboard(int key, bool pressed)

206 {

207 if(pressed) {

208 switch(key) {

209 case 'q':

210 case 'Q':

211 exit(0);

212

213 case 27:

214 if(new_curve) {

215 delete new_curve;

216 new_curve = 0;

217 post_redisplay();

218 }

219 break;

220

221 case 'l':

222 case 'L':

223 if(sel_curve) {

224 sel_curve->set_type(CURVE_LINEAR);

225 post_redisplay();

226 }

227 if(new_curve) {

228 new_curve->set_type(CURVE_LINEAR);

229 post_redisplay();

230 }

231 break;

232

233 case 'b':

234 case 'B':

235 if(sel_curve) {

236 sel_curve->set_type(CURVE_BSPLINE);

237 post_redisplay();

238 }

239 if(new_curve) {

240 new_curve->set_type(CURVE_BSPLINE);

241 post_redisplay();

242 }

243 break;

244

245 case 'h':

246 case 'H':

247 if(sel_curve) {

248 sel_curve->set_type(CURVE_HERMITE);

249 post_redisplay();

250 }

251 if(new_curve) {

252 new_curve->set_type(CURVE_HERMITE);

253 post_redisplay();

254 }

255 break;

256

257 case 'e':

258 case 'E':

259 // TODO: GUI for filename at least

260 if(!save_curves(stdout, &curves[0], (int)curves.size())) {

261 fprintf(stderr, "failed to export curves\n");

262 }

263 printf("exported %d curves\n", (int)curves.size());

264 break;

265 }

266 }

267

268

269 switch(key) {

270 case 's':

271 snap_mode = pressed ? SNAP_GRID : SNAP_NONE;

272 break;

273

274 case 'S':

275 snap_mode = pressed ? SNAP_POINT : SNAP_NONE;

276 break;

277

278 default:

279 break;

280 }

281 }

282

283 static void calc_view_matrix()

284 {

285 view_matrix.reset_identity();

286 view_matrix.scale(Vector3(view_scale, view_scale, view_scale));

287 view_matrix.translate(Vector3(view_pan.x, view_pan.y, 0.0));

288 }

289

290 static Vector2 pixel_to_uv(int x, int y)

291 {

292 float u = win_aspect * (2.0 * (float)x / (float)win_width - 1.0);

293 float v = 1.0 - 2.0 * (float)y / (float)win_height;

294

295 u = u / view_scale - view_pan.x;

296 v = v / view_scale - view_pan.y;

297 return Vector2(u, v);

298 /*

299 Matrix4x4 inv_view_matrix = view_matrix.inverse();

300 Vector4 res = Vector4(u, v, 0.0, 1.0).transformed(inv_view_matrix);

301

302 return Vector2(res.x, res.y);

303 */

304 }

305

306 static int prev_x, prev_y;

307 static int click_pos[8][2];

308 static unsigned int bnstate;

309

310 #define BNBIT(x) (1 << (x))

311

312 void app_mouse_button(int bn, bool pressed, int x, int y)

313 {

314 prev_x = x;

315 prev_y = y;

316 if(pressed) {

317 bnstate |= BNBIT(bn);

318 } else {

319 bnstate &= ~BNBIT(bn);

320 }

321

322 if(pressed) {

323 click_pos[bn][0] = x;

324 click_pos[bn][1] = y;

325 } else {

326 int dx = x - click_pos[bn][0];

327 int dy = y - click_pos[bn][1];

328

329 if(abs(dx) + abs(dy) < 3) {

330 Vector2 uv = pixel_to_uv(x, y);

331 on_click(bn, uv.x, uv.y);

332 }

333

334 if(!(bnstate & BNBIT(2))) {

335 delete weight_label;

336 weight_label = 0;

337 post_redisplay();

338 }

339 }

340 }

341

342 static bool point_hit_test(const Vector2 &pos, Curve **curveret, int *pidxret)

343 {

344 float thres = 0.02 / view_scale;

345

346 for(size_t i=0; i<curves.size(); i++) {

347 int pidx = curves[i]->nearest_point(pos);

348 if(pidx == -1) continue;

349

350 Vector2 cp = curves[i]->get_point(pidx);

351 if((cp - pos).length_sq() < thres * thres) {

352 *curveret = curves[i];

353 *pidxret = pidx;

354 return true;

355 }

356 }

357 *curveret = 0;

358 *pidxret = -1;

359 return false;

360 }

361

362 static Vector2 snap(const Vector2 &p)

363 {

364 switch(snap_mode) {

365 case SNAP_GRID:

366 return Vector2(round(p.x / grid_size) * grid_size, round(p.y / grid_size) * grid_size);

367 case SNAP_POINT:

368 // TODO

369 default:

370 break;

371 }

372 return p;

373 }

374

375 void app_mouse_motion(int x, int y)

376 {

377 Vector2 prev_uv = pixel_to_uv(prev_x, prev_y);

378

379 int dx = x - prev_x;

380 int dy = y - prev_y;

381 prev_x = x;

382 prev_y = y;

383

384 if(!dx && !dy) return;

385

386 Vector2 uv = pixel_to_uv(x, y);

387 #ifdef DRAW_MOUSE_POINTER

388 mouse_pointer = uv;

389 post_redisplay();

390 #endif

391

392 /* when entering a new curve, have the last (extra) point following

393 * the mouse until it's entered by a click (see on_click).

394 */

395 if(new_curve) {

396 new_curve->move_point(new_curve->size() - 1, snap(uv));

397 post_redisplay();

398 }

399

400 if(!new_curve && !bnstate) {

401 // not dragging, highlight curve under mouse

402 point_hit_test(uv, &hover_curve, &sel_pidx);

403 post_redisplay();

404

405 } else {

406 // we're dragging with one or more buttons held down

407

408 if(sel_curve && sel_pidx != -1) {

409 // we have a curve and a point of the curve selected

410

411 if(bnstate & BNBIT(0)) {

412 // dragging point with left button: move it

413 sel_curve->move_point(sel_pidx, snap(uv));

414 post_redisplay();

415 }

416

417 if(bnstate & BNBIT(2)) {

418 // dragging point with right button: change weight

419 float w = sel_curve->get_weight(sel_pidx);

420 w -= dy * 0.01;

421 if(w < FLT_MIN) w = FLT_MIN;

422 sel_curve->set_weight(sel_pidx, w);

423

424 // popup floating weight label if not already there

425 if(!weight_label) {

426 weight_label = new Label;

427 }

428 weight_label->set_position(uv);

429 weight_label->set_textf("w=%g", w);

430 post_redisplay();

431 }

432 } else {

433 // no selection, we're dragging in empty space: manipulate viewport

434 Vector2 dir = uv - prev_uv;

435

436 if(bnstate & (BNBIT(0) | BNBIT(1))) {

437 // panning

438 view_pan += dir;

439 calc_view_matrix();

440 post_redisplay();

441 }

442 if(bnstate & BNBIT(2)) {

443 // zooming

444 view_scale -= ((float)dy / (float)win_height) * view_scale * 5.0;

445 if(view_scale < 1e-4) view_scale = 1e-4;

446 calc_view_matrix();

447 post_redisplay();

448 }

449 }

450 }

451 }

452

453 static void on_click(int bn, float u, float v)

454 {

455 Vector2 uv = Vector2(u, v);

456

457 switch(bn) {

458 case 0: // ------- LEFT CLICK ------

459 if(hover_curve) {

460 // if we're hovering: click selects

461 sel_curve = hover_curve;

462 hover_curve = 0;

463 } else if(sel_curve) {

464 // if we have a selected curve: click adds point (enter new_curve mode)

465 std::vector<Curve*>::iterator it = std::find(curves.begin(), curves.end(), sel_curve);

466 assert(it != curves.end());

467 curves.erase(it, it + 1);

468

469 new_curve = sel_curve;

470 sel_curve = 0;

471 sel_pidx = -1;

472

473 new_curve->add_point(uv);

474 } else {

475 // otherwise, click starts a new curve

476 if(!new_curve) {

477 new_curve = new Curve;

478 new_curve->add_point(uv);

479 }

480 new_curve->add_point(uv);

481 }

482 post_redisplay();

483 break;

484

485 case 2: // ------- RIGHT CLICK ------

486 if(new_curve) {

487 // in new-curve mode: finish curve (cancels last floating segment)

488 new_curve->remove_point(new_curve->size() - 1);

489 if(new_curve->empty()) {

490 delete new_curve;

491 } else {

492 curves.push_back(new_curve);

493 }

494 new_curve = 0;

495

496 } else if(sel_curve) {

497 // in selected curve mode: delete control point or unselect

498 Curve *hit_curve;

499 int hit_pidx;

500 if(point_hit_test(uv, &hit_curve, &hit_pidx) && hit_curve == sel_curve) {

501 hit_curve->remove_point(hit_pidx);

502 sel_pidx = -1;

503 } else {

504 sel_curve = 0;

505 sel_pidx = -1;

506 }

507 }

508 post_redisplay();

509 break;

510

511 default:

512 break;

513 }

514 }