Add new ovals GM

gm/ovals.cpp

+
+/*
+ * 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.h"
+#include "SkTArray.h"
+#include "SkRandom.h"
+#include "SkMatrix.h"
+#include "SkBlurMaskFilter.h"
+#include "SkGradientShader.h"
+#include "SkBlurDrawLooper.h"
+#include "SkRect.h"
+
+namespace skiagm {
+
+class OvalGM : public GM {
+public:
+    OvalGM() {
+        this->setBGColor(0xFF000000);
+        this->makePaints();
+        this->makeMatrices();
+    }
+
+protected:
+    virtual SkString onShortName() SK_OVERRIDE {
+        return SkString("ovals");
+    }
+
+    virtual SkISize onISize() SK_OVERRIDE {
+        return make_isize(1200, 900);
+    }
+
+    void makePaints() {
+        {
+        // no AA
+        SkPaint p;
+        fPaints.push_back(p);
+        }
+
+        {
+        // AA
+        SkPaint p;
+        p.setAntiAlias(true);
+        fPaints.push_back(p);
+        }
+
+        {
+        // AA with stroke style
+        SkPaint p;
+        p.setAntiAlias(true);
+        p.setStyle(SkPaint::kStroke_Style);
+        p.setStrokeWidth(SkIntToScalar(5));
+        fPaints.push_back(p);
+        }
+
+        {
+        // AA with stroke style, width = 0
+        SkPaint p;
+        p.setAntiAlias(true);
+        p.setStyle(SkPaint::kStroke_Style);
+        fPaints.push_back(p);
+        }
+
+        {
+        // AA with stroke and fill style
+        SkPaint p;
+        p.setAntiAlias(true);
+        p.setStyle(SkPaint::kStrokeAndFill_Style);
+        p.setStrokeWidth(SkIntToScalar(3));
+        fPaints.push_back(p);
+        }
+    }
+
+    void makeMatrices() {
+        {
+        SkMatrix m;
+        m.setIdentity();
+        fMatrices.push_back(m);
+        }
+
+        {
+        SkMatrix m;
+        m.setScale(SkIntToScalar(3), SkIntToScalar(2));
+        fMatrices.push_back(m);
+        }
+
+        {
+        SkMatrix m;
+        m.setScale(SkIntToScalar(2), SkIntToScalar(2));
+        fMatrices.push_back(m);
+        }
+
+        {
+        SkMatrix m;
+        m.setScale(SkIntToScalar(1), SkIntToScalar(2));
+        fMatrices.push_back(m);
+        }
+
+        {
+        SkMatrix m;
+        m.setScale(SkIntToScalar(4), SkIntToScalar(1));
+        fMatrices.push_back(m);
+        }
+
+        {
+        SkMatrix m;
+        m.setRotate(SkIntToScalar(90));
+        fMatrices.push_back(m);
+        }
+
+        {
+        SkMatrix m;
+        m.setSkew(SkIntToScalar(2), SkIntToScalar(3));
+        fMatrices.push_back(m);
+        }
+
+        {
+        SkMatrix m;
+        m.setRotate(SkIntToScalar(60));
+        fMatrices.push_back(m);
+        }
+    }
+
+    SkColor genColor(SkMWCRandom* rand) {
+        SkScalar hsv[3];
+        hsv[0] = SkFloatToScalar(rand->nextRangeF(0.0f, 360.0f));
+        hsv[1] = SkFloatToScalar(rand->nextRangeF(0.75f, 1.0f));
+        hsv[2] = SkFloatToScalar(rand->nextRangeF(0.75f, 1.0f));
+
+        return SkHSVToColor(hsv);
+    }
+
+    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkMWCRandom rand(1);
+        canvas->translate(20 * SK_Scalar1, 20 * SK_Scalar1);
+        SkRect oval = SkRect::MakeLTRB(-20, -30, 20, 30);
+
+        const SkScalar kXStart = 60.0f;
+        const SkScalar kYStart = 80.0f;
+        const int kXStep = 150;
+        const int kYStep = 160;
+        int maxX = fMatrices.count();
+
+        SkPaint rectPaint;
+        rectPaint.setAntiAlias(true);
+        rectPaint.setStyle(SkPaint::kStroke_Style);
+        rectPaint.setStrokeWidth(SkIntToScalar(0));
+        rectPaint.setColor(SK_ColorLTGRAY);
+
+        int testCount = 0;
+        for (int i = 0; i < fPaints.count(); ++i) {        
+            for (int j = 0; j < fMatrices.count(); ++j) {
+                canvas->save();
+                SkMatrix mat = fMatrices[j];
+                // position the oval, and make it at off-integer coords.
+                mat.postTranslate(kXStart + SK_Scalar1 * kXStep * (testCount % maxX) + 
+                                  SK_Scalar1 / 4,
+                                  kYStart + SK_Scalar1 * kYStep * (testCount / maxX) + 
+                                  3 * SK_Scalar1 / 4);
+                canvas->concat(mat);
+            
+                SkColor color = genColor(&rand);
+                fPaints[i].setColor(color);
+
+                canvas->drawRect(oval, rectPaint);
+                canvas->drawOval(oval, fPaints[i]);
+
+                canvas->restore();
+
+                ++testCount;
+            }
+        }
+
+        // special cases
+
+        // non-scaled tall and skinny oval
+        for (int i = 0; i < fPaints.count(); ++i) { 
+            SkRect oval = SkRect::MakeLTRB(-20, -60, 20, 60);
+            canvas->save();
+            // position the oval, and make it at off-integer coords.
+            canvas->translate(kXStart + SK_Scalar1 * kXStep * 2.55f + SK_Scalar1 / 4,
+                              kYStart + SK_Scalar1 * kYStep * i + 3 * SK_Scalar1 / 4);
+            
+            SkColor color = genColor(&rand);
+            fPaints[i].setColor(color);
+
+            canvas->drawRect(oval, rectPaint);
+            canvas->drawOval(oval, fPaints[i]);
+            canvas->restore();
+        }
+
+        // non-scaled wide and short oval
+        for (int i = 0; i < fPaints.count(); ++i) { 
+            SkRect oval = SkRect::MakeLTRB(-80, -30, 80, 30);
+            canvas->save();
+            // position the oval, and make it at off-integer coords.
+            canvas->translate(kXStart + SK_Scalar1 * kXStep * 4 + SK_Scalar1 / 4,
+                              kYStart + SK_Scalar1 * kYStep * i + 3 * SK_Scalar1 / 4 +
+                              SK_ScalarHalf * kYStep);
+            
+            SkColor color = genColor(&rand);
+            fPaints[i].setColor(color);
+
+            canvas->drawRect(oval, rectPaint);
+            canvas->drawOval(oval, fPaints[i]);
+            canvas->restore();
+        }
+
+        // super skinny oval
+        for (int i = 0; i < fPaints.count(); ++i) { 
+            SkRect oval = SkRect::MakeLTRB(0, -60, 1, 60);
+            canvas->save();
+            // position the oval, and make it at off-integer coords.
+            canvas->translate(kXStart + SK_Scalar1 * kXStep * 3.25f + SK_Scalar1 / 4,
+                              kYStart + SK_Scalar1 * kYStep * i + 3 * SK_Scalar1 / 4);
+            
+            SkColor color = genColor(&rand);
+            fPaints[i].setColor(color);
+
+            canvas->drawOval(oval, fPaints[i]);
+            canvas->restore();
+        }
+
+        // super short oval
+        for (int i = 0; i < fPaints.count(); ++i) { 
+            SkRect oval = SkRect::MakeLTRB(-80, -1, 80, 0);
+            canvas->save();
+            // position the oval, and make it at off-integer coords.
+            canvas->translate(kXStart + SK_Scalar1 * kXStep * 2.5f + SK_Scalar1 / 4,
+                              kYStart + SK_Scalar1 * kYStep * i + 3 * SK_Scalar1 / 4 +
+                              SK_ScalarHalf * kYStep);
+            
+            SkColor color = genColor(&rand);
+            fPaints[i].setColor(color);
+
+            canvas->drawOval(oval, fPaints[i]);
+            canvas->restore();
+        }
+
+        // radial gradient
+        SkPoint center = SkPoint::Make(SkIntToScalar(0), SkIntToScalar(0));
+        SkColor colors[] = { SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN };
+        SkScalar pos[] = { 0, SK_ScalarHalf, SK_Scalar1 };
+        SkAutoTUnref<SkShader> shader(SkGradientShader::CreateRadial(center,
+                                                     SkIntToScalar(20),
+                                                     colors,
+                                                     pos,
+                                                     SK_ARRAY_COUNT(colors),
+                                                     SkShader::kClamp_TileMode));
+
+        for (int i = 0; i < fPaints.count(); ++i) { 
+            canvas->save();
+            // position the path, and make it at off-integer coords.
+            canvas->translate(kXStart + SK_Scalar1 * kXStep * 0 + SK_Scalar1 / 4,
+                              kYStart + SK_Scalar1 * kYStep * i + 3 * SK_Scalar1 / 4 +
+                              SK_ScalarHalf * kYStep);
+            
+            SkColor color = genColor(&rand);
+            fPaints[i].setColor(color);
+            fPaints[i].setShader(shader);
+
+            canvas->drawRect(oval, rectPaint);
+            canvas->drawOval(oval, fPaints[i]);
+            canvas->restore();
+        }
+    }
+
+private:
+    SkTArray<SkPaint> fPaints;
+    SkTArray<SkMatrix> fMatrices;
+
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new OvalGM; }
+static GMRegistry reg(MyFactory);
+
+}