reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2011 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 8 | #include "include/core/SkCanvas.h" |
| 9 | #include "include/core/SkColorPriv.h" |
| 10 | #include "include/core/SkFont.h" |
| 11 | #include "include/core/SkPaint.h" |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 12 | #include "include/core/SkPathBuilder.h" |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 13 | #include "include/utils/SkRandom.h" |
| 14 | #include "samplecode/Sample.h" |
Mike Reed | fae46e4 | 2019-12-04 16:15:23 -0500 | [diff] [blame] | 15 | #include "src/core/SkPathPriv.h" |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 16 | #include "tools/Resources.h" |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 17 | |
Ben Wagner | 8a1036c | 2016-11-09 15:00:49 -0500 | [diff] [blame] | 18 | constexpr int W = 150; |
| 19 | constexpr int H = 200; |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 20 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 21 | static void show_text(SkCanvas* canvas, bool doAA) { |
commit-bot@chromium.org | e0e7cfe | 2013-09-09 20:09:12 +0000 | [diff] [blame] | 22 | SkRandom rand; |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 23 | SkPaint paint; |
Hal Canary | 4484b8f | 2019-01-08 14:00:08 -0500 | [diff] [blame] | 24 | SkFont font(nullptr, 20); |
| 25 | font.setEdging(doAA ? SkFont::Edging::kSubpixelAntiAlias : SkFont::Edging::kAlias); |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 26 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 27 | for (int i = 0; i < 200; ++i) { |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 28 | paint.setColor((SK_A32_MASK << SK_A32_SHIFT) | rand.nextU()); |
Hal Canary | 4484b8f | 2019-01-08 14:00:08 -0500 | [diff] [blame] | 29 | canvas->drawString("Hamburgefons", rand.nextSScalar1() * W, rand.nextSScalar1() * H + 20, |
| 30 | font, paint); |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 31 | } |
| 32 | } |
| 33 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 34 | static void show_fill(SkCanvas* canvas, bool doAA) { |
commit-bot@chromium.org | e0e7cfe | 2013-09-09 20:09:12 +0000 | [diff] [blame] | 35 | SkRandom rand; |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 36 | SkPaint paint; |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 37 | paint.setAntiAlias(doAA); |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 38 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 39 | for (int i = 0; i < 50; ++i) { |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 40 | SkRect r; |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 41 | |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 42 | r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, |
| 43 | rand.nextUScalar1() * W, rand.nextUScalar1() * H); |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 44 | paint.setColor(rand.nextU()); |
| 45 | canvas->drawRect(r, paint); |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 46 | |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 47 | r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, |
| 48 | rand.nextUScalar1() * W, rand.nextUScalar1() * H); |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 49 | paint.setColor(rand.nextU()); |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 50 | canvas->drawOval(r, paint); |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 51 | } |
| 52 | } |
| 53 | |
commit-bot@chromium.org | e0e7cfe | 2013-09-09 20:09:12 +0000 | [diff] [blame] | 54 | static SkScalar randRange(SkRandom& rand, SkScalar min, SkScalar max) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 55 | SkASSERT(min <= max); |
Mike Reed | df85c38 | 2017-02-14 10:59:19 -0500 | [diff] [blame] | 56 | return min + rand.nextUScalar1() * (max - min); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 57 | } |
| 58 | |
| 59 | static void show_stroke(SkCanvas* canvas, bool doAA, SkScalar strokeWidth, int n) { |
commit-bot@chromium.org | e0e7cfe | 2013-09-09 20:09:12 +0000 | [diff] [blame] | 60 | SkRandom rand; |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 61 | SkPaint paint; |
| 62 | paint.setAntiAlias(doAA); |
| 63 | paint.setStyle(SkPaint::kStroke_Style); |
| 64 | paint.setStrokeWidth(strokeWidth); |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 65 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 66 | for (int i = 0; i < n; ++i) { |
| 67 | SkRect r; |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 68 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 69 | r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, |
| 70 | rand.nextUScalar1() * W, rand.nextUScalar1() * H); |
| 71 | paint.setColor(rand.nextU()); |
| 72 | canvas->drawRect(r, paint); |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 73 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 74 | r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, |
| 75 | rand.nextUScalar1() * W, rand.nextUScalar1() * H); |
| 76 | paint.setColor(rand.nextU()); |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 77 | canvas->drawOval(r, paint); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 78 | |
| 79 | const SkScalar minx = -SkIntToScalar(W)/4; |
| 80 | const SkScalar maxx = 5*SkIntToScalar(W)/4; |
| 81 | const SkScalar miny = -SkIntToScalar(H)/4; |
| 82 | const SkScalar maxy = 5*SkIntToScalar(H)/4; |
| 83 | paint.setColor(rand.nextU()); |
| 84 | canvas->drawLine(randRange(rand, minx, maxx), randRange(rand, miny, maxy), |
| 85 | randRange(rand, minx, maxx), randRange(rand, miny, maxy), |
| 86 | paint); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | static void show_hair(SkCanvas* canvas, bool doAA) { |
| 91 | show_stroke(canvas, doAA, 0, 150); |
| 92 | } |
| 93 | |
| 94 | static void show_thick(SkCanvas* canvas, bool doAA) { |
| 95 | show_stroke(canvas, doAA, SkIntToScalar(5), 50); |
| 96 | } |
| 97 | |
| 98 | typedef void (*CanvasProc)(SkCanvas*, bool); |
| 99 | |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 100 | class ClipView : public Sample { |
Hal Canary | d7639af | 2019-07-17 09:08:11 -0400 | [diff] [blame] | 101 | SkString name() override { return SkString("Clip"); } |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 102 | |
Hal Canary | d7639af | 2019-07-17 09:08:11 -0400 | [diff] [blame] | 103 | void onDrawContent(SkCanvas* canvas) override { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 104 | canvas->drawColor(SK_ColorWHITE); |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 105 | canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); |
| 106 | |
| 107 | static const CanvasProc gProc[] = { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 108 | show_text, show_thick, show_hair, show_fill |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 109 | }; |
rmistry@google.com | ae933ce | 2012-08-23 18:19:56 +0000 | [diff] [blame] | 110 | |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 111 | SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) }; |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 112 | r.inset(SK_Scalar1 / 4, SK_Scalar1 / 4); |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 113 | SkPath clipPath = SkPathBuilder().addRRect(SkRRect::MakeRectXY(r, 20, 20)).detach(); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 114 | |
| 115 | // clipPath.toggleInverseFillType(); |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 116 | |
| 117 | for (int aa = 0; aa <= 1; ++aa) { |
| 118 | canvas->save(); |
| 119 | for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); ++i) { |
| 120 | canvas->save(); |
Michael Ludwig | 2f6e2f8 | 2021-08-03 13:08:50 -0400 | [diff] [blame] | 121 | canvas->clipPath(clipPath, SkClipOp::kIntersect, SkToBool(aa)); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 122 | // canvas->drawColor(SK_ColorWHITE); |
| 123 | gProc[i](canvas, SkToBool(aa)); |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 124 | canvas->restore(); |
| 125 | canvas->translate(W * SK_Scalar1 * 8 / 7, 0); |
| 126 | } |
| 127 | canvas->restore(); |
| 128 | canvas->translate(0, H * SK_Scalar1 * 8 / 7); |
| 129 | } |
| 130 | } |
reed@google.com | 3bcf8d3 | 2011-10-10 15:42:36 +0000 | [diff] [blame] | 131 | }; |
| 132 | |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 133 | DEF_SAMPLE( return new ClipView(); ) |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 134 | |
| 135 | /////////////////////////////////////////////////////////////////////////////// |
| 136 | |
| 137 | struct SkHalfPlane { |
| 138 | SkScalar fA, fB, fC; |
| 139 | |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 140 | SkScalar eval(SkScalar x, SkScalar y) const { |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 141 | return fA * x + fB * y + fC; |
| 142 | } |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 143 | SkScalar operator()(SkScalar x, SkScalar y) const { return this->eval(x, y); } |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 144 | |
| 145 | bool twoPts(SkPoint pts[2]) const { |
Jim Van Verth | c336315 | 2019-12-03 12:05:14 -0500 | [diff] [blame] | 146 | // normalize plane to help with the perpendicular step, below |
| 147 | SkScalar len = SkScalarSqrt(fA*fA + fB*fB); |
| 148 | if (!len) { |
| 149 | return false; |
| 150 | } |
| 151 | SkScalar denom = SkScalarInvert(len); |
| 152 | SkScalar a = fA * denom; |
| 153 | SkScalar b = fB * denom; |
| 154 | SkScalar c = fC * denom; |
| 155 | |
| 156 | // We compute p0 on the half-plane by setting one of the components to 0 |
| 157 | // We compute p1 by stepping from p0 along a perpendicular to the normal |
| 158 | if (b) { |
| 159 | pts[0] = { 0, -c / b }; |
| 160 | pts[1] = { b, pts[0].fY - a}; |
| 161 | } else if (a) { |
| 162 | pts[0] = { -c / a, 0 }; |
| 163 | pts[1] = { pts[0].fX + b, -a }; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 164 | } else { |
| 165 | return false; |
| 166 | } |
Jim Van Verth | c336315 | 2019-12-03 12:05:14 -0500 | [diff] [blame] | 167 | |
| 168 | SkASSERT(SkScalarNearlyZero(this->operator()(pts[0].fX, pts[0].fY))); |
| 169 | SkASSERT(SkScalarNearlyZero(this->operator()(pts[1].fX, pts[1].fY))); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 170 | return true; |
| 171 | } |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 172 | |
| 173 | enum Result { |
| 174 | kAllNegative, |
| 175 | kAllPositive, |
| 176 | kMixed |
| 177 | }; |
| 178 | Result test(const SkRect& bounds) const { |
| 179 | SkPoint diagMin, diagMax; |
| 180 | if (fA >= 0) { |
| 181 | diagMin.fX = bounds.fLeft; |
| 182 | diagMax.fX = bounds.fRight; |
| 183 | } else { |
| 184 | diagMin.fX = bounds.fRight; |
| 185 | diagMax.fX = bounds.fLeft; |
| 186 | } |
| 187 | if (fB >= 0) { |
| 188 | diagMin.fY = bounds.fTop; |
| 189 | diagMax.fY = bounds.fBottom; |
| 190 | } else { |
| 191 | diagMin.fY = bounds.fBottom; |
| 192 | diagMax.fY = bounds.fTop; |
| 193 | } |
| 194 | SkScalar test = this->eval(diagMin.fX, diagMin.fY); |
| 195 | SkScalar sign = test*this->eval(diagMax.fX, diagMin.fY); |
| 196 | if (sign > 0) { |
| 197 | // the path is either all on one side of the half-plane or the other |
| 198 | if (test < 0) { |
| 199 | return kAllNegative; |
| 200 | } else { |
| 201 | return kAllPositive; |
| 202 | } |
| 203 | } |
| 204 | return kMixed; |
| 205 | } |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 206 | }; |
| 207 | |
| 208 | #include "src/core/SkEdgeClipper.h" |
| 209 | |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 210 | static SkPath clip(const SkPath& path, SkPoint p0, SkPoint p1) { |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 211 | SkMatrix mx, inv; |
| 212 | SkVector v = p1 - p0; |
| 213 | mx.setAll(v.fX, -v.fY, p0.fX, |
| 214 | v.fY, v.fX, p0.fY, |
| 215 | 0, 0, 1); |
| 216 | SkAssertResult(mx.invert(&inv)); |
| 217 | |
| 218 | SkPath rotated; |
| 219 | path.transform(inv, &rotated); |
| 220 | |
| 221 | SkScalar big = 1e28f; |
| 222 | SkRect clip = {-big, 0, big, big }; |
| 223 | |
| 224 | struct Rec { |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 225 | SkPathBuilder fResult; |
| 226 | SkPoint fPrev = {0, 0}; |
| 227 | } rec; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 228 | |
Mike Klein | 71f1266 | 2020-10-28 09:07:09 -0500 | [diff] [blame] | 229 | SkEdgeClipper::ClipPath(rotated, clip, false, |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 230 | [](SkEdgeClipper* clipper, bool newCtr, void* ctx) { |
| 231 | Rec* rec = (Rec*)ctx; |
| 232 | |
| 233 | bool addLineTo = false; |
| 234 | SkPoint pts[4]; |
| 235 | SkPath::Verb verb; |
| 236 | while ((verb = clipper->next(pts)) != SkPath::kDone_Verb) { |
| 237 | if (newCtr) { |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 238 | rec->fResult.moveTo(pts[0]); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 239 | rec->fPrev = pts[0]; |
| 240 | newCtr = false; |
| 241 | } |
| 242 | |
| 243 | if (addLineTo || pts[0] != rec->fPrev) { |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 244 | rec->fResult.lineTo(pts[0]); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | switch (verb) { |
| 248 | case SkPath::kLine_Verb: |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 249 | rec->fResult.lineTo(pts[1]); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 250 | rec->fPrev = pts[1]; |
| 251 | break; |
| 252 | case SkPath::kQuad_Verb: |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 253 | rec->fResult.quadTo(pts[1], pts[2]); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 254 | rec->fPrev = pts[2]; |
| 255 | break; |
| 256 | case SkPath::kCubic_Verb: |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 257 | rec->fResult.cubicTo(pts[1], pts[2], pts[3]); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 258 | rec->fPrev = pts[3]; |
| 259 | break; |
| 260 | default: break; |
| 261 | } |
| 262 | addLineTo = true; |
| 263 | } |
| 264 | }, &rec); |
| 265 | |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 266 | return rec.fResult.detach().makeTransform(mx); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 267 | } |
| 268 | |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 269 | static void draw_halfplane(SkCanvas* canvas, SkPoint p0, SkPoint p1, SkColor c) { |
| 270 | SkVector v = p1 - p0; |
| 271 | p0 = p0 - v * 1000; |
| 272 | p1 = p1 + v * 1000; |
| 273 | |
| 274 | SkPaint paint; |
| 275 | paint.setColor(c); |
| 276 | canvas->drawLine(p0, p1, paint); |
| 277 | } |
| 278 | |
| 279 | static SkPath make_path() { |
| 280 | SkRandom rand; |
Mike Reed | 0483b46 | 2019-12-05 17:29:45 -0500 | [diff] [blame] | 281 | auto rand_pt = [&rand]() { |
| 282 | auto x = rand.nextF(); |
| 283 | auto y = rand.nextF(); |
| 284 | return SkPoint{x * 400, y * 400}; |
| 285 | }; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 286 | |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 287 | SkPathBuilder path; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 288 | for (int i = 0; i < 4; ++i) { |
Mike Reed | 0483b46 | 2019-12-05 17:29:45 -0500 | [diff] [blame] | 289 | SkPoint pts[6]; |
| 290 | for (auto& p : pts) { |
| 291 | p = rand_pt(); |
| 292 | } |
| 293 | path.moveTo(pts[0]).quadTo(pts[1], pts[2]).quadTo(pts[3], pts[4]).lineTo(pts[5]); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 294 | } |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 295 | return path.detach(); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | class HalfPlaneView : public Sample { |
| 299 | SkPoint fPts[2]; |
| 300 | SkPath fPath; |
| 301 | |
| 302 | SkString name() override { return SkString("halfplane"); } |
| 303 | |
| 304 | void onOnceBeforeDraw() override { |
| 305 | fPts[0] = {0, 0}; |
| 306 | fPts[1] = {3, 2}; |
| 307 | fPath = make_path(); |
| 308 | } |
| 309 | |
| 310 | void onDrawContent(SkCanvas* canvas) override { |
| 311 | SkPaint paint; |
| 312 | |
| 313 | paint.setColor({0.5f, 0.5f, 0.5f, 1.0f}, nullptr); |
| 314 | canvas->drawPath(fPath, paint); |
| 315 | |
| 316 | paint.setColor({0, 0, 0, 1}, nullptr); |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 317 | |
Mike Reed | d5b51a0 | 2020-07-30 21:50:30 -0400 | [diff] [blame] | 318 | canvas->drawPath(clip(fPath, fPts[0], fPts[1]), paint); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 319 | |
| 320 | draw_halfplane(canvas, fPts[0], fPts[1], SK_ColorRED); |
| 321 | } |
| 322 | |
| 323 | Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override { |
| 324 | return new Click; |
| 325 | } |
| 326 | |
| 327 | bool onClick(Click* click) override { |
| 328 | fPts[0] = click->fCurr; |
| 329 | fPts[1] = fPts[0] + SkPoint{3, 2}; |
| 330 | return true; |
| 331 | } |
| 332 | }; |
| 333 | DEF_SAMPLE( return new HalfPlaneView(); ) |
| 334 | |
| 335 | static void draw_halfplane(SkCanvas* canvas, const SkHalfPlane& p, SkColor c) { |
| 336 | SkPoint pts[2]; |
| 337 | p.twoPts(pts); |
| 338 | draw_halfplane(canvas, pts[0], pts[1], c); |
| 339 | } |
| 340 | |
John Stiles | c5fc970 | 2021-08-10 19:54:46 -0400 | [diff] [blame] | 341 | static void compute_half_planes(const SkMatrix& mx, SkScalar width, SkScalar height, |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 342 | SkHalfPlane planes[4]) { |
| 343 | SkScalar a = mx[0], b = mx[1], c = mx[2], |
| 344 | d = mx[3], e = mx[4], f = mx[5], |
| 345 | g = mx[6], h = mx[7], i = mx[8]; |
| 346 | |
John Stiles | c5fc970 | 2021-08-10 19:54:46 -0400 | [diff] [blame] | 347 | planes[0] = { 2*g - 2*a/width, 2*h - 2*b/width, 2*i - 2*c/width }; |
| 348 | planes[1] = { 2*a/width, 2*b/width, 2*c/width }; |
| 349 | planes[2] = { 2*g - 2*d/height, 2*h - 2*e/height, 2*i - 2*f/height }; |
| 350 | planes[3] = { 2*d/height, 2*e/height, 2*f/height }; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | class HalfPlaneView2 : public Sample { |
| 354 | SkPoint fPts[4]; |
| 355 | SkPath fPath; |
| 356 | |
| 357 | SkString name() override { return SkString("halfplane2"); } |
| 358 | |
| 359 | void onOnceBeforeDraw() override { |
| 360 | fPath = make_path(); |
| 361 | SkRect r = fPath.getBounds(); |
| 362 | r.toQuad(fPts); |
| 363 | } |
| 364 | |
| 365 | void onDrawContent(SkCanvas* canvas) override { |
| 366 | SkMatrix mx; |
| 367 | { |
| 368 | SkRect r = fPath.getBounds(); |
| 369 | SkPoint src[4]; |
| 370 | r.toQuad(src); |
| 371 | mx.setPolyToPoly(src, fPts, 4); |
| 372 | } |
| 373 | |
| 374 | SkPaint paint; |
| 375 | canvas->drawPath(fPath, paint); |
| 376 | |
| 377 | canvas->save(); |
| 378 | canvas->concat(mx); |
| 379 | paint.setColor(0x40FF0000); |
| 380 | canvas->drawPath(fPath, paint); |
| 381 | canvas->restore(); |
| 382 | |
| 383 | // draw the frame |
| 384 | paint.setStrokeWidth(10); |
| 385 | paint.setColor(SK_ColorGREEN); |
| 386 | canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, fPts, paint); |
| 387 | |
| 388 | // draw the half-planes |
| 389 | SkHalfPlane planes[4]; |
| 390 | compute_half_planes(mx, 400, 400, planes); |
| 391 | for (auto& p : planes) { |
| 392 | draw_halfplane(canvas, p, SK_ColorRED); |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override { |
| 397 | SkScalar r = 8; |
| 398 | SkRect rect = SkRect::MakeXYWH(x - r, y - r, 2*r, 2*r); |
| 399 | for (int i = 0; i < 4; ++i) { |
| 400 | if (rect.contains(fPts[i].fX, fPts[i].fY)) { |
| 401 | Click* c = new Click; |
| 402 | c->fMeta.setS32("index", i); |
| 403 | return c; |
| 404 | } |
| 405 | } |
| 406 | return nullptr; |
| 407 | } |
| 408 | |
| 409 | bool onClick(Click* click) override { |
| 410 | int32_t index; |
| 411 | SkAssertResult(click->fMeta.findS32("index", &index)); |
| 412 | SkASSERT(index >= 0 && index < 4); |
| 413 | fPts[index] = click->fCurr; |
| 414 | return true; |
| 415 | } |
| 416 | }; |
| 417 | DEF_SAMPLE( return new HalfPlaneView2(); ) |
| 418 | |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 419 | static SkM44 inv(const SkM44& m) { |
| 420 | SkM44 inverse; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 421 | SkAssertResult(m.invert(&inverse)); |
| 422 | return inverse; |
| 423 | } |
| 424 | |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 425 | static SkHalfPlane half_plane_w0(const SkMatrix& m) { |
| 426 | return { m[SkMatrix::kMPersp0], m[SkMatrix::kMPersp1], m[SkMatrix::kMPersp2] - 0.05f }; |
Jim Van Verth | c336315 | 2019-12-03 12:05:14 -0500 | [diff] [blame] | 427 | } |
| 428 | |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 429 | class SampleCameraView : public Sample { |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 430 | float fNear = 0.05f; |
| 431 | float fFar = 4; |
| 432 | float fAngle = SK_ScalarPI / 4; |
| 433 | |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 434 | SkV3 fEye { 0, 0, 1.0f/tan(fAngle/2) - 1 }; |
| 435 | SkV3 fCOA { 0, 0, 0 }; |
| 436 | SkV3 fUp { 0, 1, 0 }; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 437 | |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 438 | SkM44 fRot; |
| 439 | SkV3 fTrans; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 440 | |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 441 | void rotate(float x, float y, float z) { |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 442 | SkM44 r; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 443 | if (x) { |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 444 | r.setRotateUnit({1, 0, 0}, x); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 445 | } else if (y) { |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 446 | r.setRotateUnit({0, 1, 0}, y); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 447 | } else { |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 448 | r.setRotateUnit({0, 0, 1}, z); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 449 | } |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 450 | fRot = r * fRot; |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 451 | } |
| 452 | |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 453 | public: |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 454 | SkM44 get44(const SkRect& r) const { |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 455 | SkScalar w = r.width(); |
| 456 | SkScalar h = r.height(); |
| 457 | |
Michael Ludwig | e501670 | 2021-03-23 15:42:59 -0400 | [diff] [blame] | 458 | SkM44 camera = SkM44::LookAt(fEye, fCOA, fUp), |
| 459 | perspective = SkM44::Perspective(fNear, fFar, fAngle), |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 460 | translate = SkM44::Translate(fTrans.x, fTrans.y, fTrans.z), |
| 461 | viewport = SkM44::Translate(r.centerX(), r.centerY(), 0) * |
| 462 | SkM44::Scale(w*0.5f, h*0.5f, 1); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 463 | |
Jim Van Verth | c336315 | 2019-12-03 12:05:14 -0500 | [diff] [blame] | 464 | return viewport * perspective * camera * translate * fRot * inv(viewport); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 465 | } |
| 466 | |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 467 | bool onChar(SkUnichar uni) override { |
| 468 | float delta = SK_ScalarPI / 30; |
| 469 | switch (uni) { |
| 470 | case '8': this->rotate( delta, 0, 0); return true; |
| 471 | case '2': this->rotate(-delta, 0, 0); return true; |
| 472 | case '4': this->rotate(0, delta, 0); return true; |
| 473 | case '6': this->rotate(0, -delta, 0); return true; |
| 474 | case '-': this->rotate(0, 0, delta); return true; |
| 475 | case '+': this->rotate(0, 0, -delta); return true; |
| 476 | |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 477 | case 'i': fTrans.z += 0.1f; SkDebugf("z %g\n", fTrans.z); return true; |
| 478 | case 'k': fTrans.z -= 0.1f; SkDebugf("z %g\n", fTrans.z); return true; |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 479 | |
| 480 | case 'n': fNear += 0.1f; SkDebugf("near %g\n", fNear); return true; |
| 481 | case 'N': fNear -= 0.1f; SkDebugf("near %g\n", fNear); return true; |
| 482 | case 'f': fFar += 0.1f; SkDebugf("far %g\n", fFar); return true; |
| 483 | case 'F': fFar -= 0.1f; SkDebugf("far %g\n", fFar); return true; |
| 484 | default: break; |
| 485 | } |
| 486 | return false; |
| 487 | } |
| 488 | }; |
| 489 | |
| 490 | class HalfPlaneView3 : public SampleCameraView { |
| 491 | SkPath fPath; |
| 492 | sk_sp<SkShader> fShader; |
| 493 | bool fShowUnclipped = false; |
| 494 | |
| 495 | SkString name() override { return SkString("halfplane3"); } |
| 496 | |
| 497 | void onOnceBeforeDraw() override { |
| 498 | fPath = make_path(); |
| 499 | fShader = GetResourceAsImage("images/mandrill_128.png") |
Mike Reed | 99c9446 | 2020-12-08 13:16:56 -0500 | [diff] [blame] | 500 | ->makeShader(SkSamplingOptions(), SkMatrix::Scale(3, 3)); |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | bool onChar(SkUnichar uni) override { |
| 504 | switch (uni) { |
| 505 | case 'u': fShowUnclipped = !fShowUnclipped; return true; |
| 506 | default: break; |
| 507 | } |
| 508 | return this->SampleCameraView::onChar(uni); |
| 509 | } |
| 510 | |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 511 | void onDrawContent(SkCanvas* canvas) override { |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 512 | SkM44 mx = this->get44({0, 0, 400, 400}); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 513 | |
| 514 | SkPaint paint; |
| 515 | paint.setColor({0.75, 0.75, 0.75, 1}); |
| 516 | canvas->drawPath(fPath, paint); |
| 517 | |
| 518 | paint.setShader(fShader); |
| 519 | |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 520 | if (fShowUnclipped) { |
| 521 | canvas->save(); |
Mike Reed | 3ef77dd | 2020-04-06 10:41:09 -0400 | [diff] [blame] | 522 | canvas->concat(mx); |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 523 | paint.setAlphaf(0.33f); |
| 524 | canvas->drawPath(fPath, paint); |
| 525 | paint.setAlphaf(1.f); |
| 526 | canvas->restore(); |
| 527 | } |
| 528 | |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 529 | |
| 530 | SkColor planeColor = SK_ColorBLUE; |
| 531 | SkPath clippedPath, *path = &fPath; |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 532 | if (SkPathPriv::PerspectiveClip(fPath, mx.asM33(), &clippedPath)) { |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 533 | path = &clippedPath; |
| 534 | planeColor = SK_ColorRED; |
| 535 | } |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 536 | canvas->save(); |
Mike Reed | 3ef77dd | 2020-04-06 10:41:09 -0400 | [diff] [blame] | 537 | canvas->concat(mx); |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 538 | canvas->drawPath(*path, paint); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 539 | canvas->restore(); |
| 540 | |
Mike Reed | 00a9764 | 2020-01-25 18:42:23 -0500 | [diff] [blame] | 541 | SkHalfPlane hpw = half_plane_w0(mx.asM33()); |
Mike Reed | 6344c29 | 2019-12-04 12:45:39 -0500 | [diff] [blame] | 542 | draw_halfplane(canvas, hpw, planeColor); |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 543 | } |
Mike Reed | 63edc57 | 2019-11-15 21:58:01 -0500 | [diff] [blame] | 544 | }; |
| 545 | DEF_SAMPLE( return new HalfPlaneView3(); ) |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 546 | |
| 547 | class HalfPlaneCoons : public SampleCameraView { |
| 548 | SkPoint fPatch[12]; |
Mike Reed | 190b82d | 2019-12-17 17:25:27 -0500 | [diff] [blame] | 549 | SkColor fColors[4] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK }; |
| 550 | SkPoint fTex[4] = {{0, 0}, {256, 0}, {256, 256}, {0, 256}}; |
| 551 | sk_sp<SkShader> fShader; |
| 552 | |
| 553 | bool fShowHandles = false; |
| 554 | bool fShowSkeleton = false; |
| 555 | bool fShowTex = false; |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 556 | |
| 557 | SkString name() override { return SkString("halfplane-coons"); } |
| 558 | |
| 559 | void onOnceBeforeDraw() override { |
| 560 | fPatch[0] = { 0, 0 }; |
| 561 | fPatch[1] = { 100, 0 }; |
| 562 | fPatch[2] = { 200, 0 }; |
| 563 | fPatch[3] = { 300, 0 }; |
| 564 | fPatch[4] = { 300, 100 }; |
| 565 | fPatch[5] = { 300, 200 }; |
| 566 | fPatch[6] = { 300, 300 }; |
| 567 | fPatch[7] = { 200, 300 }; |
| 568 | fPatch[8] = { 100, 300 }; |
| 569 | fPatch[9] = { 0, 300 }; |
| 570 | fPatch[10] = { 0, 200 }; |
| 571 | fPatch[11] = { 0, 100 }; |
Mike Reed | 190b82d | 2019-12-17 17:25:27 -0500 | [diff] [blame] | 572 | |
Mike Reed | 99c9446 | 2020-12-08 13:16:56 -0500 | [diff] [blame] | 573 | fShader = GetResourceAsImage("images/mandrill_256.png")->makeShader(SkSamplingOptions()); |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | void onDrawContent(SkCanvas* canvas) override { |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 577 | SkPaint paint; |
| 578 | |
| 579 | canvas->save(); |
Mike Reed | 3ef77dd | 2020-04-06 10:41:09 -0400 | [diff] [blame] | 580 | canvas->concat(this->get44({0, 0, 300, 300})); |
Mike Reed | 190b82d | 2019-12-17 17:25:27 -0500 | [diff] [blame] | 581 | |
| 582 | const SkPoint* tex = nullptr; |
| 583 | const SkColor* col = nullptr; |
| 584 | if (!fShowSkeleton) { |
| 585 | if (fShowTex) { |
| 586 | paint.setShader(fShader); |
| 587 | tex = fTex; |
| 588 | } else { |
| 589 | col = fColors; |
| 590 | } |
| 591 | } |
| 592 | canvas->drawPatch(fPatch, col, tex, SkBlendMode::kSrc, paint); |
| 593 | paint.setShader(nullptr); |
| 594 | |
| 595 | if (fShowHandles) { |
| 596 | paint.setAntiAlias(true); |
| 597 | paint.setStrokeCap(SkPaint::kRound_Cap); |
| 598 | paint.setStrokeWidth(8); |
| 599 | canvas->drawPoints(SkCanvas::kPoints_PointMode, 12, fPatch, paint); |
| 600 | paint.setColor(SK_ColorWHITE); |
| 601 | paint.setStrokeWidth(6); |
| 602 | canvas->drawPoints(SkCanvas::kPoints_PointMode, 12, fPatch, paint); |
| 603 | } |
| 604 | |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 605 | canvas->restore(); |
| 606 | } |
Mike Reed | 190b82d | 2019-12-17 17:25:27 -0500 | [diff] [blame] | 607 | |
| 608 | Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey modi) override { |
| 609 | auto dist = [](SkPoint a, SkPoint b) { return (b - a).length(); }; |
| 610 | |
| 611 | const float tol = 15; |
| 612 | for (int i = 0; i < 12; ++i) { |
| 613 | if (dist({x,y}, fPatch[i]) <= tol) { |
Mike Reed | 0ce3e88 | 2020-04-22 11:09:30 -0400 | [diff] [blame] | 614 | return new Click([this, i](Click* c) { |
| 615 | fPatch[i] = c->fCurr; |
| 616 | return true; |
| 617 | }); |
Mike Reed | 190b82d | 2019-12-17 17:25:27 -0500 | [diff] [blame] | 618 | } |
| 619 | } |
| 620 | return nullptr; |
| 621 | } |
| 622 | |
Mike Reed | 190b82d | 2019-12-17 17:25:27 -0500 | [diff] [blame] | 623 | bool onChar(SkUnichar uni) override { |
| 624 | switch (uni) { |
| 625 | case 'h': fShowHandles = !fShowHandles; return true; |
Mike Reed | c880346 | 2019-12-18 13:34:15 -0500 | [diff] [blame] | 626 | case 'k': fShowSkeleton = !fShowSkeleton; return true; |
Mike Reed | 190b82d | 2019-12-17 17:25:27 -0500 | [diff] [blame] | 627 | case 't': fShowTex = !fShowTex; return true; |
| 628 | default: break; |
| 629 | } |
| 630 | return this->SampleCameraView::onChar(uni); |
| 631 | } |
| 632 | |
Mike Reed | cbeabd9 | 2019-12-16 17:13:58 -0500 | [diff] [blame] | 633 | }; |
| 634 | DEF_SAMPLE( return new HalfPlaneCoons(); ) |