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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 "include/core/SkCanvas.h"
- #include "include/core/SkPath.h"
- #include "samplecode/Sample.h"
- // Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
- // Renders a string art shape.
- // The particular shape rendered can be controlled by clicking horizontally, thereby
- // generating an angle from 0 to 1.
- class StringArtView : public Sample {
- public:
- StringArtView() : fAngle(0.305f) {}
- protected:
- SkString name() override { return SkString("StringArt"); }
- void onDrawContent(SkCanvas* canvas) override {
- SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
- SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height()));
- SkScalar length = 5;
- SkScalar step = angle;
- SkPath path;
- path.moveTo(center);
- while (length < (SkScalarHalf(SkMinScalar(this->width(), this->height())) - 10.f))
- {
- SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
- length*SkScalarSin(step) + center.fY);
- path.lineTo(rp);
- length += angle / SkScalarHalf(SK_ScalarPI);
- step += angle;
- }
- path.close();
- SkPaint paint;
- paint.setAntiAlias(true);
- paint.setStyle(SkPaint::kStroke_Style);
- paint.setColor(0xFF007700);
- canvas->drawPath(path, paint);
- }
- Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, ModifierKey) override {
- fAngle = x/width();
- return nullptr;
- }
- private:
- SkScalar fAngle;
- typedef Sample INHERITED;
- };
- //////////////////////////////////////////////////////////////////////////////
- DEF_SAMPLE( return new StringArtView(); )
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