strokerects.cpp

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/*
 * 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 "gm/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "src/base/SkRandom.h"
 
namespace skiagm {
 
#define W   400
#define H   400
#define N   100
 
constexpr SkScalar SW = SkIntToScalar(W);
constexpr SkScalar SH = SkIntToScalar(H);
 
class StrokeRectsGM : public GM {
public:
    StrokeRectsGM(bool rotated) : fRotated(rotated) {}
 
protected:
    SkString getName() const override {
        if (fRotated) {
            return SkString("strokerects_rotated");
        } else {
            return SkString("strokerects");
        }
    }
 
    SkISize getISize() override { return SkISize::Make(W * 2, H * 2); }
 
    static void rnd_rect(SkRect* r, SkRandom& rand) {
        SkScalar x = rand.nextUScalar1() * W;
        SkScalar y = rand.nextUScalar1() * H;
        SkScalar w = rand.nextUScalar1() * (W >> 2);
        SkScalar h = rand.nextUScalar1() * (H >> 2);
        SkScalar hoffset = rand.nextSScalar1();
        SkScalar woffset = rand.nextSScalar1();
 
        r->setXYWH(x, y, w, h);
        r->offset(-w/2 + woffset, -h/2 + hoffset);
    }
 
    void onDraw(SkCanvas* canvas) override {
        if (fRotated) {
            canvas->rotate(45.f, SW, SH);
        }
 
        SkPaint paint;
        paint.setStyle(SkPaint::kStroke_Style);
 
        for (int y = 0; y < 2; y++) {
            paint.setAntiAlias(!!y);
            for (int x = 0; x < 2; x++) {
                paint.setStrokeWidth(x * SkIntToScalar(3));
 
                SkAutoCanvasRestore acr(canvas, true);
                canvas->translate(SW * x, SH * y);
                canvas->clipRect(SkRect::MakeLTRB(
                        SkIntToScalar(2), SkIntToScalar(2)
                        , SW - SkIntToScalar(2), SH - SkIntToScalar(2)
                ));
 
                SkRandom rand;
                for (int i = 0; i < N; i++) {
                    SkRect r;
                    rnd_rect(&r, rand);
                    canvas->drawRect(r, paint);
                }
            }
        }
    }
 
private:
    bool fRotated;
};
 
//////////////////////////////////////////////////////////////////////////////
 
DEF_GM( return new StrokeRectsGM(false); )
DEF_GM( return new StrokeRectsGM(true); )
 
}  // namespace skiagm