samplecode/SampleFillType.cpp

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "include/core/SkCanvas.h"
#include "include/core/SkPath.h"
#include "include/core/SkRegion.h"
#include "include/core/SkShader.h"
#include "include/effects/SkCornerPathEffect.h"
#include "include/effects/SkGradientShader.h"
#include "samplecode/Sample.h"
#include "src/utils/SkUTF.h"

class FillTypeView : public Sample {
    SkPath fPath;
public:
    FillTypeView() {
        const SkScalar radius = SkIntToScalar(45);
        fPath.addCircle(SkIntToScalar(50), SkIntToScalar(50), radius);
        fPath.addCircle(SkIntToScalar(100), SkIntToScalar(100), radius);

        this->setBGColor(0xFFDDDDDD);
    }

protected:
    SkString name() override{ return SkString("FillType"); }

    void showPath(SkCanvas* canvas, int x, int y, SkPathFillType ft,
                  SkScalar scale, const SkPaint& paint) {

        const SkRect r = { 0, 0, SkIntToScalar(150), SkIntToScalar(150) };

        canvas->save();
        canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
        canvas->clipRect(r);
        canvas->drawColor(SK_ColorWHITE);
        fPath.setFillType(ft);
        canvas->translate(r.centerX(), r.centerY());
        canvas->scale(scale, scale);
        canvas->translate(-r.centerX(), -r.centerY());
        canvas->drawPath(fPath, paint);
        canvas->restore();
    }

    void showFour(SkCanvas* canvas, SkScalar scale, const SkPaint& paint) {
        showPath(canvas,   0,   0, SkPathFillType::kWinding,
                 scale, paint);
        showPath(canvas, 200,   0, SkPathFillType::kEvenOdd,
                 scale, paint);
        showPath(canvas,  00, 200, SkPathFillType::kInverseWinding,
                 scale, paint);
        showPath(canvas, 200, 200, SkPathFillType::kInverseEvenOdd,
                 scale, paint);
    }

    void onDrawContent(SkCanvas* canvas) override {
        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));

        SkPaint paint;
        const SkScalar scale = SkIntToScalar(5)/4;

        paint.setAntiAlias(false);
        paint.setColor(0x8000FF00);

        showFour(canvas, SK_Scalar1, paint);
        canvas->translate(SkIntToScalar(450), 0);
        showFour(canvas, scale, paint);

        paint.setAntiAlias(true);

        canvas->translate(SkIntToScalar(-450), SkIntToScalar(450));
        showFour(canvas, SK_Scalar1, paint);
        canvas->translate(SkIntToScalar(450), 0);
        showFour(canvas, scale, paint);
    }

private:
    using INHERITED = Sample;
};

//////////////////////////////////////////////////////////////////////////////

DEF_SAMPLE( return new FillTypeView(); )