add specialty strokeRect() to SkStroke, which can return much cleaner results
Review URL: https://codereview.appspot.com/6843093
git-svn-id: http://skia.googlecode.com/svn/trunk@6510 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/strokerect.cpp b/gm/strokerect.cpp
new file mode 100644
index 0000000..f075600
--- /dev/null
+++ b/gm/strokerect.cpp
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2012 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 "SkCanvas.h"
+#include "SkPath.h"
+
+#define STROKE_WIDTH SkIntToScalar(20)
+
+static void draw_path(SkCanvas* canvas, const SkPath& path, const SkRect& rect, SkPaint::Join join) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setStyle(SkPaint::kStroke_Style);
+
+ paint.setColor(SK_ColorGRAY);
+ paint.setStrokeWidth(STROKE_WIDTH);
+ paint.setStrokeJoin(join);
+ canvas->drawRect(rect, paint);
+
+ paint.setStrokeWidth(0);
+ paint.setColor(SK_ColorRED);
+ canvas->drawPath(path, paint);
+
+ paint.setStrokeWidth(3);
+ paint.setStrokeJoin(SkPaint::kMiter_Join);
+ int n = path.countPoints();
+ SkAutoTArray<SkPoint> points(n);
+ path.getPoints(points.get(), n);
+ canvas->drawPoints(SkCanvas::kPoints_PointMode, n, points.get(), paint);
+}
+
+/*
+ * Test calling SkStroker for rectangles. Cases to cover:
+ *
+ * geometry: normal, small (smaller than stroke-width), empty, inverted
+ * joint-type for the corners
+ */
+class StrokeRectGM : public skiagm::GM {
+public:
+ StrokeRectGM() {}
+
+protected:
+ virtual SkString onShortName() {
+ return SkString("strokerect");
+ }
+
+ virtual SkISize onISize() {
+ return SkISize::Make(1024, 480);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ canvas->drawColor(SK_ColorWHITE);
+ canvas->translate(STROKE_WIDTH*3/2, STROKE_WIDTH*3/2);
+
+ SkPaint paint;
+ paint.setStyle(SkPaint::kStroke_Style);
+ paint.setStrokeWidth(STROKE_WIDTH);
+
+ static const SkPaint::Join gJoins[] = {
+ SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
+ };
+
+ static const SkScalar W = 80;
+ static const SkScalar H = 110;
+ static const SkRect gRects[] = {
+ { 0, 0, W, H },
+ { W, 0, 0, H },
+ { 0, H, W, 0 },
+ { 0, 0, STROKE_WIDTH, H },
+ { 0, 0, W, STROKE_WIDTH },
+ { 0, 0, STROKE_WIDTH/2, STROKE_WIDTH/2 },
+ { 0, 0, W, 0 },
+ { 0, 0, 0, H },
+ { 0, 0, 0, 0 },
+ };
+
+ for (size_t i = 0; i < SK_ARRAY_COUNT(gJoins); ++i) {
+ SkPaint::Join join = gJoins[i];
+ paint.setStrokeJoin(join);
+
+ SkAutoCanvasRestore acr(canvas, true);
+ for (size_t j = 0; j < SK_ARRAY_COUNT(gRects); ++j) {
+ const SkRect& r = gRects[j];
+
+ SkPath path, fillPath;
+ path.addRect(r);
+ paint.getFillPath(path, &fillPath);
+ draw_path(canvas, fillPath, r, join);
+
+ canvas->translate(W + 2 * STROKE_WIDTH, 0);
+ }
+ acr.restore();
+ canvas->translate(0, H + 2 * STROKE_WIDTH);
+ }
+ }
+
+private:
+ typedef GM INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+DEF_GM(return new StrokeRectGM;)
+