Parametric contour start GM
A GM to capture the newly added SkPath API.
BUG=chromium:315277
R=caryclark@google.com,reed@google.com
Review URL: https://codereview.chromium.org/1457503002
diff --git a/gm/pathcontourstart.cpp b/gm/pathcontourstart.cpp
new file mode 100644
index 0000000..de3644c
--- /dev/null
+++ b/gm/pathcontourstart.cpp
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2015 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 "SkDashPathEffect.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkRRect.h"
+
+namespace skiagm {
+
+class ContourStartGM : public GM {
+public:
+ ContourStartGM() {
+ const SkScalar kMaxDashLen = 100;
+ const SkScalar kDashGrowth = 1.2f;
+
+ SkSTArray<100, SkScalar> intervals;
+ for (SkScalar len = 1; len < kMaxDashLen; len *= kDashGrowth) {
+ intervals.push_back(len);
+ intervals.push_back(len);
+ }
+
+ SkAutoTUnref<SkPathEffect> effect(
+ SkDashPathEffect::Create(intervals.begin(), intervals.count(), 0));
+
+ fDashPaint.setAntiAlias(true);
+ fDashPaint.setStyle(SkPaint::kStroke_Style);
+ fDashPaint.setStrokeWidth(6);
+ fDashPaint.setColor(0xff008000);
+ fDashPaint.setPathEffect(effect);
+
+ fPointsPaint.setColor(0xff800000);
+ fPointsPaint.setStrokeWidth(3);
+
+ fRect = SkRect::MakeLTRB(10, 10, 100, 70);
+ }
+
+protected:
+ SkString onShortName() override {
+ return SkString("contour_start");
+ }
+
+ SkISize onISize() override { return SkISize::Make(kImageWidth, kImageHeight); }
+
+ void onDraw(SkCanvas* canvas) override {
+
+ drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
+ SkPath path;
+ path.addRect(rect, dir, startIndex);
+ return path;
+ });
+
+ drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
+ SkPath path;
+ path.addOval(rect, dir, startIndex);
+ return path;
+ });
+
+ drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
+ SkRRect rrect;
+ const SkVector radii[4] = { {15, 15}, {15, 15}, {15, 15}, {15, 15}};
+ rrect.setRectRadii(rect, radii);
+
+ SkPath path;
+ path.addRRect(rrect, dir, startIndex);
+ return path;
+ });
+
+ drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
+ SkRRect rrect;
+ rrect.setRect(rect);
+
+ SkPath path;
+ path.addRRect(rrect, dir, startIndex);
+ return path;
+ });
+
+ drawDirs(canvas, [](const SkRect& rect, SkPath::Direction dir, unsigned startIndex) {
+ SkRRect rrect;
+ rrect.setOval(rect);
+
+ SkPath path;
+ path.addRRect(rrect, dir, startIndex);
+ return path;
+ });
+
+ }
+
+private:
+ static const int kImageWidth = 1200;
+ static const int kImageHeight = 600;
+
+ SkPaint fDashPaint, fPointsPaint;
+ SkRect fRect;
+
+ void drawDirs(SkCanvas* canvas,
+ SkPath (*makePath)(const SkRect&, SkPath::Direction, unsigned)) const {
+ drawOneColumn(canvas, SkPath::kCW_Direction, makePath);
+ canvas->translate(kImageWidth / 10, 0);
+ drawOneColumn(canvas, SkPath::kCCW_Direction, makePath);
+ canvas->translate(kImageWidth / 10, 0);
+ }
+
+ void drawOneColumn(SkCanvas* canvas, SkPath::Direction dir,
+ SkPath (*makePath)(const SkRect&, SkPath::Direction, unsigned)) const {
+ SkAutoCanvasRestore acr(canvas, true);
+
+ for (unsigned i = 0; i < 8; ++i) {
+ const SkPath path = makePath(fRect, dir, i);
+ canvas->drawPath(path, fDashPaint);
+
+ const int n = path.countPoints();
+ SkAutoTArray<SkPoint> points(n);
+ path.getPoints(points.get(), n);
+ canvas->drawPoints(SkCanvas::kPoints_PointMode, n, points.get(), fPointsPaint);
+
+ canvas->translate(0, kImageHeight / 8);
+ }
+ }
+
+ typedef GM INHERITED;
+};
+
+DEF_GM( return new ContourStartGM(); )
+
+} // namespace skiagm
+