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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 "include/core/SkCanvas.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkPath.h"
- #include "samplecode/Sample.h"
- // ensure that we don't accidentally screw up the bounds when the oval is
- // fractional, and the impl computes the center and radii, and uses them to
- // reconstruct the edges of the circle.
- // see bug# 1504910
- static void test_circlebounds(SkCanvas*) {
- SkRect r = { 1.39999998f, 1, 21.3999996f, 21 };
- SkPath p;
- p.addOval(r);
- SkASSERT(r == p.getBounds());
- }
- class CircleView : public Sample {
- SkString name() override { return SkString("Circles"); }
- void circle(SkCanvas* canvas, int width, bool aa) {
- SkPaint paint;
- paint.setAntiAlias(aa);
- if (width < 0) {
- paint.setStyle(SkPaint::kFill_Style);
- } else {
- paint.setStyle(SkPaint::kStroke_Style);
- paint.setStrokeWidth(SkIntToScalar(width));
- }
- canvas->drawCircle(0, 0, 9.0f, paint);
- if (false) { // avoid bit rot, suppress warning
- test_circlebounds(canvas);
- }
- }
- void drawSix(SkCanvas* canvas, SkScalar dx, SkScalar dy) {
- for (int width = -1; width <= 1; width++) {
- canvas->save();
- circle(canvas, width, false);
- canvas->translate(0, dy);
- circle(canvas, width, true);
- canvas->restore();
- canvas->translate(dx, 0);
- }
- }
- static void make_poly(SkPath* path, int n) {
- if (n <= 0) {
- return;
- }
- path->incReserve(n + 1);
- path->moveTo(SK_Scalar1, 0);
- SkScalar step = SK_ScalarPI * 2 / n;
- SkScalar angle = 0;
- for (int i = 1; i < n; i++) {
- angle += step;
- path->lineTo(SkScalarCos(angle), SkScalarSin(angle));
- }
- path->close();
- }
- void onDrawContent(SkCanvas* canvas) override {
- SkPaint paint;
- paint.setAntiAlias(true);
- paint.setStyle(SkPaint::kStroke_Style);
- SkMatrix matrix;
- matrix.setScale(SkIntToScalar(100), SkIntToScalar(100));
- matrix.postTranslate(SkIntToScalar(200), SkIntToScalar(200));
- canvas->concat(matrix);
- for (int n = 3; n < 20; n++) {
- SkPath path;
- make_poly(&path, n);
- SkAutoCanvasRestore acr(canvas, true);
- canvas->rotate(SkIntToScalar(10) * (n - 3));
- canvas->translate(-SK_Scalar1, 0);
- canvas->drawPath(path, paint);
- }
- }
- };
- DEF_SAMPLE( return new CircleView(); )
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