Skip to content
Navigation Menu
{{ message }}
forked from solvespace/solvespace
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathrender.cpp
More file actions
446 lines (378 loc) · 14.4 KB
/
Copy pathrender.cpp
File metadata and controls
446 lines (378 loc) · 14.4 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
//-----------------------------------------------------------------------------
// Backend-agnostic rendering interface, and various backends we use.
//
// Copyright 2016 whitequark
//-----------------------------------------------------------------------------
#include "solvespace.h"
namespace SolveSpace {
//-----------------------------------------------------------------------------
// Camera transformations.
//-----------------------------------------------------------------------------
Point2d Camera::ProjectPoint(Vector p) const {
Vector p3 = ProjectPoint3(p);
Point2d p2 = { p3.x, p3.y };
return p2;
}
Vector Camera::ProjectPoint3(Vector p) const {
double w;
Vector r = ProjectPoint4(p, &w);
return r.ScaledBy(scale/w);
}
Vector Camera::ProjectPoint4(Vector p, double *w) const {
p = p.Plus(offset);
Vector r;
r.x = p.Dot(projRight);
r.y = p.Dot(projUp);
r.z = p.Dot(projUp.Cross(projRight));
*w = 1 + r.z*tangent*scale;
return r;
}
Vector Camera::UnProjectPoint(Point2d p) const {
Vector orig = offset.ScaledBy(-1);
// Note that we're ignoring the effects of perspective. Since our returned
// point has the same component normal to the screen as the offset, it
// will have z = 0 after the rotation is applied, thus w = 1. So this is
// correct.
orig = orig.Plus(projRight.ScaledBy(p.x / scale)).Plus(
projUp. ScaledBy(p.y / scale));
return orig;
}
Vector Camera::UnProjectPoint3(Vector p) const {
p.z = p.z / (scale - p.z * tangent * scale);
double w = 1 + p.z * tangent * scale;
p.x *= w / scale;
p.y *= w / scale;
Vector orig = offset.ScaledBy(-1);
orig = orig.Plus(projRight.ScaledBy(p.x)).Plus(
projUp. ScaledBy(p.y).Plus(
projUp.Cross(projRight). ScaledBy(p.z)));
return orig;
}
Vector Camera::VectorFromProjs(Vector rightUpForward) const {
Vector n = projRight.Cross(projUp);
Vector r = (projRight.ScaledBy(rightUpForward.x));
r = r.Plus(projUp.ScaledBy(rightUpForward.y));
r = r.Plus(n.ScaledBy(rightUpForward.z));
return r;
}
Vector Camera::AlignToPixelGrid(Vector v) const {
if(!hasPixels) return v;
v = ProjectPoint3(v);
v.x = floor(v.x) + 0.5;
v.y = floor(v.y) + 0.5;
return UnProjectPoint3(v);
}
SBezier Camera::ProjectBezier(SBezier b) const {
Quaternion q = Quaternion::From(projRight, projUp);
q = q.Inverse();
// we want Q*(p - o) = Q*p - Q*o
b = b.TransformedBy(q.Rotate(offset).ScaledBy(scale), q, scale);
for(int i = 0; i <= b.deg; i++) {
Vector4 ct = Vector4::From(b.weight[i], b.ctrl[i]);
// so the desired curve, before perspective, is
// (x/w, y/w, z/w)
// and after perspective is
// ((x/w)/(1 - (z/w)*tangent, ...
// = (x/(w - z*tangent), ...
// so we want to let w' = w - z*tangent
ct.w = ct.w - ct.z*tangent;
b.ctrl[i] = ct.PerspectiveProject();
b.weight[i] = ct.w;
}
return b;
}
void Camera::LoadIdentity() {
offset = { 0.0, 0.0, 0.0 };
projRight = { 1.0, 0.0, 0.0 };
projUp = { 0.0, 1.0, 0.0 };
scale = 1.0;
tangent = 0.0;
}
void Camera::NormalizeProjectionVectors() {
if(projRight.Magnitude() < LENGTH_EPS) {
projRight = Vector::From(1, 0, 0);
}
Vector norm = projRight.Cross(projUp);
// If projRight and projUp somehow ended up parallel, then pick an
// arbitrary projUp normal to projRight.
if(norm.Magnitude() < LENGTH_EPS) {
norm = projRight.Normal(0);
}
projUp = norm.Cross(projRight);
projUp = projUp.WithMagnitude(1);
projRight = projRight.WithMagnitude(1);
}
//-----------------------------------------------------------------------------
// Stroke and fill caching.
//-----------------------------------------------------------------------------
bool Canvas::Stroke::Equals(const Stroke &other) const {
return (layer == other.layer &&
zIndex == other.zIndex &&
color.Equals(other.color) &&
width == other.width &&
unit == other.unit &&
stipplePattern == other.stipplePattern &&
stippleScale == other.stippleScale);
}
double Canvas::Stroke::WidthMm(const Camera &camera) const {
switch(unit) {
case Canvas::Unit::MM:
return width;
case Canvas::Unit::PX:
return width / camera.scale;
default:
ssassert(false, "Unexpected unit");
}
}
double Canvas::Stroke::WidthPx(const Camera &camera) const {
switch(unit) {
case Canvas::Unit::MM:
return width * camera.scale;
case Canvas::Unit::PX:
return width;
default:
ssassert(false, "Unexpected unit");
}
}
double Canvas::Stroke::StippleScaleMm(const Camera &camera) const {
switch(unit) {
case Canvas::Unit::MM:
return stippleScale;
case Canvas::Unit::PX:
return stippleScale / camera.scale;
default:
ssassert(false, "Unexpected unit");
}
}
double Canvas::Stroke::StippleScalePx(const Camera &camera) const {
switch(unit) {
case Canvas::Unit::MM:
return stippleScale * camera.scale;
case Canvas::Unit::PX:
return stippleScale;
default:
ssassert(false, "Unexpected unit");
}
}
bool Canvas::Fill::Equals(const Fill &other) const {
return (layer == other.layer &&
zIndex == other.zIndex &&
color.Equals(other.color) &&
pattern == other.pattern &&
texture == other.texture);
}
void Canvas::Clear() {
strokes.Clear();
fills.Clear();
}
Canvas::hStroke Canvas::GetStroke(const Stroke &stroke) {
for(const Stroke &s : strokes) {
if(s.Equals(stroke)) return s.h;
}
Stroke strokeCopy = stroke;
return strokes.AddAndAssignId(&strokeCopy);
}
Canvas::hFill Canvas::GetFill(const Fill &fill) {
for(const Fill &f : fills) {
if(f.Equals(fill)) return f.h;
}
Fill fillCopy = fill;
return fills.AddAndAssignId(&fillCopy);
}
std::shared_ptr<BatchCanvas> Canvas::CreateBatch() {
return std::shared_ptr<BatchCanvas>();
}
//-----------------------------------------------------------------------------
// An interface for view-independent visualization
//-----------------------------------------------------------------------------
const Camera &BatchCanvas::GetCamera() const {
ssassert(false, "Geometry drawn on BatchCanvas must be independent from camera");
}
//-----------------------------------------------------------------------------
// A wrapper around Canvas that simplifies drawing UI in screen coordinates
//-----------------------------------------------------------------------------
void UiCanvas::DrawLine(int x1, int y1, int x2, int y2, RgbaColor color, int width, int zIndex) {
Vector va = { (double)x1 + 0.5, (double)Flip(y1) + 0.5, 0.0 },
vb = { (double)x2 + 0.5, (double)Flip(y2) + 0.5, 0.0 };
Canvas::Stroke stroke = {};
stroke.layer = Canvas::Layer::NORMAL;
stroke.zIndex = zIndex;
stroke.width = (double)width;
stroke.color = color;
stroke.unit = Canvas::Unit::PX;
Canvas::hStroke hcs = canvas->GetStroke(stroke);
canvas->DrawLine(va, vb, hcs);
}
void UiCanvas::DrawRect(int l, int r, int t, int b, RgbaColor fillColor, RgbaColor outlineColor,
int zIndex) {
Vector va = { (double)l + 0.5, (double)Flip(b) + 0.5, 0.0 },
vb = { (double)l + 0.5, (double)Flip(t) + 0.5, 0.0 },
vc = { (double)r + 0.5, (double)Flip(t) + 0.5, 0.0 },
vd = { (double)r + 0.5, (double)Flip(b) + 0.5, 0.0 };
if(!fillColor.IsEmpty()) {
Canvas::Fill fill = {};
fill.layer = Canvas::Layer::NORMAL;
fill.zIndex = zIndex;
fill.color = fillColor;
Canvas::hFill hcf = canvas->GetFill(fill);
canvas->DrawQuad(va, vb, vc, vd, hcf);
}
if(!outlineColor.IsEmpty()) {
Canvas::Stroke stroke = {};
stroke.layer = Canvas::Layer::NORMAL;
stroke.zIndex = zIndex;
stroke.width = 1.0;
stroke.color = outlineColor;
stroke.unit = Canvas::Unit::PX;
Canvas::hStroke hcs = canvas->GetStroke(stroke);
canvas->DrawLine(va, vb, hcs);
canvas->DrawLine(vb, vc, hcs);
canvas->DrawLine(vc, vd, hcs);
canvas->DrawLine(vd, va, hcs);
}
}
void UiCanvas::DrawPixmap(std::shared_ptr<const Pixmap> pm, int x, int y, int zIndex) {
Canvas::Fill fill = {};
fill.layer = Canvas::Layer::NORMAL;
fill.zIndex = zIndex;
fill.color = { 255, 255, 255, 255 };
Canvas::hFill hcf = canvas->GetFill(fill);
canvas->DrawPixmap(pm,
{ (double)x, (double)(flip ? Flip(y) - pm->height : y), 0.0 },
{ (double)pm->width, 0.0, 0.0 },
{ 0.0, (double)pm->height, 0.0 },
{ 0.0, 1.0 },
{ 1.0, 0.0 },
hcf);
}
void UiCanvas::DrawBitmapChar(char32_t codepoint, int x, int y, RgbaColor color, int zIndex) {
BitmapFont *font = BitmapFont::Builtin();
Canvas::Fill fill = {};
fill.layer = Canvas::Layer::NORMAL;
fill.zIndex = zIndex;
fill.color = color;
Canvas::hFill hcf = canvas->GetFill(fill);
if(codepoint >= 0xe000 && codepoint <= 0xefff) {
// Special character, like a checkbox or a radio button
x -= 3;
}
double s0, t0, s1, t1;
size_t w, h;
font->LocateGlyph(codepoint, &s0, &t0, &s1, &t1, &w, &h);
if(font->textureUpdated) {
// LocateGlyph modified the texture, reload it.
canvas->InvalidatePixmap(font->texture);
font->textureUpdated = false;
}
canvas->DrawPixmap(font->texture,
{ (double)x, (double)Flip(y), 0.0 },
{ (double)w, 0.0, 0.0 },
{ 0.0, (double) h, 0.0 },
{ s0, t1 },
{ s1, t0 },
hcf);
}
void UiCanvas::DrawBitmapText(const std::string &str, int x, int y, RgbaColor color, int zIndex) {
BitmapFont *font = BitmapFont::Builtin();
for(char32_t codepoint : ReadUTF8(str)) {
DrawBitmapChar(codepoint, x, y, color, zIndex);
x += font->GetWidth(codepoint) * 8;
}
}
//-----------------------------------------------------------------------------
// A canvas that performs picking against drawn geometry.
//-----------------------------------------------------------------------------
void ObjectPicker::DoCompare(double distance, int zIndex, int comparePosition) {
if(distance > selRadius) return;
if((zIndex == maxZIndex && distance < minDistance) || (zIndex > maxZIndex)) {
minDistance = distance;
maxZIndex = zIndex;
position = comparePosition;
}
}
void ObjectPicker::DoQuad(const Vector &a, const Vector &b, const Vector &c, const Vector &d,
int zIndex, int comparePosition) {
Point2d corners[4] = {
camera.ProjectPoint(a),
camera.ProjectPoint(b),
camera.ProjectPoint(c),
camera.ProjectPoint(d)
};
double minNegative = VERY_NEGATIVE,
maxPositive = VERY_POSITIVE;
for(int i = 0; i < 4; i++) {
Point2d ap = corners[i],
bp = corners[(i + 1) % 4];
double distance = point.DistanceToLineSigned(ap, bp.Minus(ap), /*asSegment=*/true);
if(distance < 0) minNegative = std::max(minNegative, distance);
if(distance > 0) maxPositive = std::min(maxPositive, distance);
}
bool insideQuad = (minNegative == VERY_NEGATIVE || maxPositive == VERY_POSITIVE);
if(insideQuad) {
DoCompare(0.0, zIndex, comparePosition);
} else {
double distance = std::min(fabs(minNegative), fabs(maxPositive));
DoCompare(distance, zIndex, comparePosition);
}
}
void ObjectPicker::DrawLine(const Vector &a, const Vector &b, hStroke hcs) {
Stroke *stroke = strokes.FindById(hcs);
Point2d ap = camera.ProjectPoint(a);
Point2d bp = camera.ProjectPoint(b);
double distance = point.DistanceToLine(ap, bp.Minus(ap), /*asSegment=*/true);
DoCompare(distance - stroke->width / 2.0, stroke->zIndex);
}
void ObjectPicker::DrawEdges(const SEdgeList &el, hStroke hcs) {
Stroke *stroke = strokes.FindById(hcs);
for(const SEdge &e : el.l) {
Point2d ap = camera.ProjectPoint(e.a);
Point2d bp = camera.ProjectPoint(e.b);
double distance = point.DistanceToLine(ap, bp.Minus(ap), /*asSegment=*/true);
DoCompare(distance - stroke->width / 2.0, stroke->zIndex, e.auxB);
}
}
void ObjectPicker::DrawOutlines(const SOutlineList &ol, hStroke hcs, DrawOutlinesAs drawAs) {
ssassert(false, "Not implemented");
}
void ObjectPicker::DrawVectorText(const std::string &text, double height,
const Vector &o, const Vector &u, const Vector &v,
hStroke hcs) {
Stroke *stroke = strokes.FindById(hcs);
double w = VectorFont::Builtin()-> GetWidth(height, text),
h = VectorFont::Builtin()->GetHeight(height);
DoQuad(o,
o.Plus(v.ScaledBy(h)),
o.Plus(u.ScaledBy(w)).Plus(v.ScaledBy(h)),
o.Plus(u.ScaledBy(w)),
stroke->zIndex);
}
void ObjectPicker::DrawQuad(const Vector &a, const Vector &b, const Vector &c, const Vector &d,
hFill hcf) {
Fill *fill = fills.FindById(hcf);
DoQuad(a, b, c, d, fill->zIndex);
}
void ObjectPicker::DrawPoint(const Vector &o, Canvas::hStroke hcs) {
Stroke *stroke = strokes.FindById(hcs);
double distance = point.DistanceTo(camera.ProjectPoint(o)) - stroke->width / 2;
DoCompare(distance, stroke->zIndex);
}
void ObjectPicker::DrawPolygon(const SPolygon &p, hFill hcf) {
ssassert(false, "Not implemented");
}
void ObjectPicker::DrawMesh(const SMesh &m, hFill hcfFront, hFill hcfBack) {
ssassert(false, "Not implemented");
}
void ObjectPicker::DrawFaces(const SMesh &m, const std::vector<uint32_t> &faces, hFill hcf) {
ssassert(false, "Not implemented");
}
void ObjectPicker::DrawPixmap(std::shared_ptr<const Pixmap> pm,
const Vector &o, const Vector &u, const Vector &v,
const Point2d &ta, const Point2d &tb, Canvas::hFill hcf) {
ssassert(false, "Not implemented");
}
bool ObjectPicker::Pick(std::function<void()> drawFn) {
minDistance = VERY_POSITIVE;
drawFn();
return minDistance < selRadius;
}
}
You can’t perform that action at this time.