| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "gm/gm.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPathBuilder.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSize.h" |
| #include "include/core/SkString.h" |
| #include "include/core/SkTypes.h" |
| #include "include/private/base/SkTArray.h" |
| #include "src/base/SkRandom.h" |
| |
| using namespace skia_private; |
| |
| namespace skiagm { |
| |
| // This GM tests a grab-bag of convex and concave polygons. They are triangles, |
| // trapezoid, diamond, polygons with lots of edges, several concave polygons... |
| // But rectangles are excluded. |
| class PolygonsGM: public GM { |
| public: |
| PolygonsGM() {} |
| |
| protected: |
| |
| SkString onShortName() override { |
| return SkString("polygons"); |
| } |
| |
| SkISize onISize() override { |
| int width = kNumPolygons * kCellSize + 40; |
| int height = (kNumJoins * kNumStrokeWidths + kNumExtraStyles) * kCellSize + 40; |
| return SkISize::Make(width, height); |
| } |
| |
| // Construct all polygons |
| void onOnceBeforeDraw() override { |
| SkPoint p0[] = {{0, 0}, {60, 0}, {90, 40}}; // triangle |
| SkPoint p1[] = {{0, 0}, {0, 40}, {60, 40}, {40, 0}}; // trapezoid |
| SkPoint p2[] = {{0, 0}, {40, 40}, {80, 40}, {40, 0}}; // diamond |
| SkPoint p3[] = {{10, 0}, {50, 0}, {60, 10}, {60, 30}, {50, 40}, |
| {10, 40}, {0, 30}, {0, 10}}; // octagon |
| SkPoint p4[32]; // circle-like polygons with 32-edges. |
| SkPoint p5[] = {{0, 0}, {20, 20}, {0, 40}, {60, 20}}; // concave polygon with 4 edges |
| SkPoint p6[] = {{0, 40}, {0, 30}, {15, 30}, {15, 20}, {30, 20}, |
| {30, 10}, {45, 10}, {45, 0}, {60, 0}, {60, 40}}; // stairs-like polygon |
| SkPoint p7[] = {{0, 20}, {20, 20}, {30, 0}, {40, 20}, {60, 20}, |
| {45, 30}, {55, 50}, {30, 40}, {5, 50}, {15, 30}}; // five-point stars |
| |
| for (size_t i = 0; i < std::size(p4); ++i) { |
| SkScalar angle = 2 * SK_ScalarPI * i / std::size(p4); |
| p4[i].set(20 * SkScalarCos(angle) + 20, 20 * SkScalarSin(angle) + 20); |
| } |
| |
| struct Polygons { |
| SkPoint* fPoints; |
| size_t fPointNum; |
| } pgs[] = { |
| { p0, std::size(p0) }, |
| { p1, std::size(p1) }, |
| { p2, std::size(p2) }, |
| { p3, std::size(p3) }, |
| { p4, std::size(p4) }, |
| { p5, std::size(p5) }, |
| { p6, std::size(p6) }, |
| { p7, std::size(p7) } |
| }; |
| |
| SkASSERT(std::size(pgs) == kNumPolygons); |
| for (size_t pgIndex = 0; pgIndex < std::size(pgs); ++pgIndex) { |
| SkPathBuilder b; |
| b.moveTo(pgs[pgIndex].fPoints[0].fX, |
| pgs[pgIndex].fPoints[0].fY); |
| for (size_t ptIndex = 1; ptIndex < pgs[pgIndex].fPointNum; ++ptIndex) { |
| b.lineTo(pgs[pgIndex].fPoints[ptIndex].fX, |
| pgs[pgIndex].fPoints[ptIndex].fY); |
| } |
| b.close(); |
| fPolygons.push_back(b.detach()); |
| } |
| } |
| |
| // Set the location for the current test on the canvas |
| static void SetLocation(SkCanvas* canvas, int counter, int lineNum) { |
| SkScalar x = SK_Scalar1 * kCellSize * (counter % lineNum) + 30 + SK_Scalar1 / 4; |
| SkScalar y = SK_Scalar1 * kCellSize * (counter / lineNum) + 30 + 3 * SK_Scalar1 / 4; |
| canvas->translate(x, y); |
| } |
| |
| static void SetColorAndAlpha(SkPaint* paint, SkRandom* rand) { |
| SkColor color = rand->nextU(); |
| color |= 0xff000000; |
| paint->setColor(color); |
| if (40 == paint->getStrokeWidth()) { |
| paint->setAlpha(0xA0); |
| } |
| } |
| |
| void onDraw(SkCanvas* canvas) override { |
| // Stroke widths are: |
| // 0(may use hairline rendering), 10(common case for stroke-style) |
| // 40(>= geometry width/height, make the contour filled in fact) |
| constexpr int kStrokeWidths[] = {0, 10, 40}; |
| SkASSERT(kNumStrokeWidths == std::size(kStrokeWidths)); |
| |
| constexpr SkPaint::Join kJoins[] = { |
| SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join |
| }; |
| SkASSERT(kNumJoins == std::size(kJoins)); |
| |
| int counter = 0; |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| SkRandom rand; |
| // For stroke style painter |
| paint.setStyle(SkPaint::kStroke_Style); |
| for (int join = 0; join < kNumJoins; ++join) { |
| for (int width = 0; width < kNumStrokeWidths; ++width) { |
| for (int i = 0; i < fPolygons.size(); ++i) { |
| canvas->save(); |
| SetLocation(canvas, counter, fPolygons.size()); |
| |
| SetColorAndAlpha(&paint, &rand); |
| paint.setStrokeJoin(kJoins[join]); |
| paint.setStrokeWidth(SkIntToScalar(kStrokeWidths[width])); |
| |
| canvas->drawPath(fPolygons[i], paint); |
| canvas->restore(); |
| ++counter; |
| } |
| } |
| } |
| |
| // For stroke-and-fill style painter and fill style painter |
| constexpr SkPaint::Style kStyles[] = { |
| SkPaint::kStrokeAndFill_Style, SkPaint::kFill_Style |
| }; |
| SkASSERT(kNumExtraStyles == std::size(kStyles)); |
| |
| paint.setStrokeJoin(SkPaint::kMiter_Join); |
| paint.setStrokeWidth(SkIntToScalar(20)); |
| for (int style = 0; style < kNumExtraStyles; ++style) { |
| paint.setStyle(kStyles[style]); |
| for (int i = 0; i < fPolygons.size(); ++i) { |
| canvas->save(); |
| SetLocation(canvas, counter, fPolygons.size()); |
| SetColorAndAlpha(&paint, &rand); |
| canvas->drawPath(fPolygons[i], paint); |
| canvas->restore(); |
| ++counter; |
| } |
| } |
| } |
| |
| private: |
| inline static constexpr int kNumPolygons = 8; |
| inline static constexpr int kCellSize = 100; |
| inline static constexpr int kNumExtraStyles = 2; |
| inline static constexpr int kNumStrokeWidths = 3; |
| inline static constexpr int kNumJoins = 3; |
| |
| TArray<SkPath> fPolygons; |
| using INHERITED = GM; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_GM(return new PolygonsGM;) |
| |
| // see crbug.com/1197461 |
| DEF_SIMPLE_GM(conjoined_polygons, canvas, 400, 400) { |
| SkPathBuilder b; |
| b.moveTo(0.f, 120.f); |
| b.lineTo(0.f, 0.f); |
| b.lineTo(50.f, 330.f); |
| b.lineTo(90.f, 0.f); |
| b.lineTo(340.f, 0.f); |
| b.lineTo(90.f, 330.f); |
| b.lineTo(50.f, 330.f); |
| b.close(); |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| canvas->drawPath(b.detach(), paint); |
| } |
| |
| } // namespace skiagm |