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- /*
- * 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/SkPath.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/SkTArray.h"
- #include "include/utils/SkRandom.h"
- 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 < SK_ARRAY_COUNT(p4); ++i) {
- SkScalar angle = 2 * SK_ScalarPI * i / SK_ARRAY_COUNT(p4);
- p4[i].set(20 * SkScalarCos(angle) + 20, 20 * SkScalarSin(angle) + 20);
- }
- struct Polygons {
- SkPoint* fPoints;
- size_t fPointNum;
- } pgs[] = {
- { p0, SK_ARRAY_COUNT(p0) },
- { p1, SK_ARRAY_COUNT(p1) },
- { p2, SK_ARRAY_COUNT(p2) },
- { p3, SK_ARRAY_COUNT(p3) },
- { p4, SK_ARRAY_COUNT(p4) },
- { p5, SK_ARRAY_COUNT(p5) },
- { p6, SK_ARRAY_COUNT(p6) },
- { p7, SK_ARRAY_COUNT(p7) }
- };
- SkASSERT(SK_ARRAY_COUNT(pgs) == kNumPolygons);
- for (size_t pgIndex = 0; pgIndex < SK_ARRAY_COUNT(pgs); ++pgIndex) {
- fPolygons.push_back().moveTo(pgs[pgIndex].fPoints[0].fX,
- pgs[pgIndex].fPoints[0].fY);
- for (size_t ptIndex = 1; ptIndex < pgs[pgIndex].fPointNum; ++ptIndex) {
- fPolygons.back().lineTo(pgs[pgIndex].fPoints[ptIndex].fX,
- pgs[pgIndex].fPoints[ptIndex].fY);
- }
- fPolygons.back().close();
- }
- }
- // 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 == SK_ARRAY_COUNT(kStrokeWidths));
- constexpr SkPaint::Join kJoins[] = {
- SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
- };
- SkASSERT(kNumJoins == SK_ARRAY_COUNT(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.count(); ++i) {
- canvas->save();
- SetLocation(canvas, counter, fPolygons.count());
- 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 == SK_ARRAY_COUNT(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.count(); ++i) {
- canvas->save();
- SetLocation(canvas, counter, fPolygons.count());
- SetColorAndAlpha(&paint, &rand);
- canvas->drawPath(fPolygons[i], paint);
- canvas->restore();
- ++counter;
- }
- }
- }
- private:
- static constexpr int kNumPolygons = 8;
- static constexpr int kCellSize = 100;
- static constexpr int kNumExtraStyles = 2;
- static constexpr int kNumStrokeWidths = 3;
- static constexpr int kNumJoins = 3;
- SkTArray<SkPath> fPolygons;
- typedef GM INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_GM(return new PolygonsGM;)
- }
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