aboutsummaryrefslogtreecommitdiffstats
path: root/gm/convexpaths.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'gm/convexpaths.cpp')
-rw-r--r--gm/convexpaths.cpp202
1 files changed, 202 insertions, 0 deletions
diff --git a/gm/convexpaths.cpp b/gm/convexpaths.cpp
new file mode 100644
index 0000000..2c719e8
--- /dev/null
+++ b/gm/convexpaths.cpp
@@ -0,0 +1,202 @@
+
+/*
+ * 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.h"
+#include "SkRandom.h"
+#include "SkTArray.h"
+
+namespace skiagm {
+
+class ConvexPathsGM : public GM {
+public:
+ ConvexPathsGM() {
+ this->setBGColor(0xFF000000);
+ this->makePaths();
+ }
+
+protected:
+ virtual SkString onShortName() {
+ return SkString("convexpaths");
+ }
+
+
+ virtual SkISize onISize() {
+ return make_isize(1200, 900);
+ }
+
+ void makePaths() {
+ // CW
+ fPaths.push_back().moveTo(0, 0);
+ fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1,
+ 0, 100 * SK_Scalar1);
+ fPaths.back().lineTo(0, 0);
+
+ // CCW
+ fPaths.push_back().moveTo(0, 0);
+ fPaths.back().lineTo(0, 100 * SK_Scalar1);
+ fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1,
+ 0, 0);
+
+ // CW
+ fPaths.push_back().moveTo(0, 50 * SK_Scalar1);
+ fPaths.back().quadTo(50 * SK_Scalar1, 0,
+ 100 * SK_Scalar1, 50 * SK_Scalar1);
+ fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1,
+ 0, 50 * SK_Scalar1);
+
+ // CCW
+ fPaths.push_back().moveTo(0, 50 * SK_Scalar1);
+ fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1,
+ 100 * SK_Scalar1, 50 * SK_Scalar1);
+ fPaths.back().quadTo(50 * SK_Scalar1, 0,
+ 0, 50 * SK_Scalar1);
+
+ fPaths.push_back().addRect(0, 0,
+ 100 * SK_Scalar1, 100 * SK_Scalar1,
+ SkPath::kCW_Direction);
+
+ fPaths.push_back().addRect(0, 0,
+ 100 * SK_Scalar1, 100 * SK_Scalar1,
+ SkPath::kCCW_Direction);
+
+ fPaths.push_back().addCircle(50 * SK_Scalar1, 50 * SK_Scalar1,
+ 50 * SK_Scalar1, SkPath::kCW_Direction);
+
+ fPaths.push_back().addCircle(50 * SK_Scalar1, 50 * SK_Scalar1,
+ 40 * SK_Scalar1, SkPath::kCCW_Direction);
+
+ fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0,
+ 50 * SK_Scalar1,
+ 100 * SK_Scalar1),
+ SkPath::kCW_Direction);
+
+ fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0,
+ 100 * SK_Scalar1,
+ 50 * SK_Scalar1),
+ SkPath::kCCW_Direction);
+
+ fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0,
+ 100 * SK_Scalar1,
+ 5 * SK_Scalar1),
+ SkPath::kCCW_Direction);
+
+ fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0,
+ SK_Scalar1,
+ 100 * SK_Scalar1),
+ SkPath::kCCW_Direction);
+
+ fPaths.push_back().addRoundRect(SkRect::MakeXYWH(0, 0,
+ SK_Scalar1 * 100,
+ SK_Scalar1 * 100),
+ 40 * SK_Scalar1, 20 * SK_Scalar1,
+ SkPath::kCW_Direction);
+
+ fPaths.push_back().addRoundRect(SkRect::MakeXYWH(0, 0,
+ SK_Scalar1 * 100,
+ SK_Scalar1 * 100),
+ 20 * SK_Scalar1, 40 * SK_Scalar1,
+ SkPath::kCCW_Direction);
+
+ // shallow diagonals
+ fPaths.push_back().lineTo(100 * SK_Scalar1, SK_Scalar1);
+ fPaths.back().lineTo(98 * SK_Scalar1, 100 * SK_Scalar1);
+ fPaths.back().lineTo(3 * SK_Scalar1, 96 * SK_Scalar1);
+
+ /*
+ It turns out arcTos are not automatically marked as convex and they
+ may in fact be ever so slightly concave.
+ fPaths.push_back().arcTo(SkRect::MakeXYWH(0, 0,
+ 50 * SK_Scalar1,
+ 100 * SK_Scalar1),
+ 25 * SK_Scalar1, 130 * SK_Scalar1, false);
+ */
+
+ // cubics
+ fPaths.push_back().cubicTo( 1 * SK_Scalar1, 1 * SK_Scalar1,
+ 10 * SK_Scalar1, 90 * SK_Scalar1,
+ 0 * SK_Scalar1, 100 * SK_Scalar1);
+ fPaths.push_back().cubicTo(100 * SK_Scalar1, 50 * SK_Scalar1,
+ 20 * SK_Scalar1, 100 * SK_Scalar1,
+ 0 * SK_Scalar1, 0 * SK_Scalar1);
+
+ // triangle where one edge is a degenerate quad
+ fPaths.push_back().moveTo(SkFloatToScalar(8.59375f), 45 * SK_Scalar1);
+ fPaths.back().quadTo(SkFloatToScalar(16.9921875f), 45 * SK_Scalar1,
+ SkFloatToScalar(31.25f), 45 * SK_Scalar1);
+ fPaths.back().lineTo(100 * SK_Scalar1, 100 * SK_Scalar1);
+ fPaths.back().lineTo(SkFloatToScalar(8.59375f), 45 * SK_Scalar1);
+
+ // point degenerate
+ fPaths.push_back().moveTo(50 * SK_Scalar1, 50 * SK_Scalar1);
+ fPaths.back().lineTo(50 * SK_Scalar1, 50 * SK_Scalar1);
+
+ fPaths.push_back().moveTo(50 * SK_Scalar1, 50 * SK_Scalar1);
+ fPaths.back().quadTo(50 * SK_Scalar1, 50 * SK_Scalar1,
+ 50 * SK_Scalar1, 50 * SK_Scalar1);
+ fPaths.push_back().moveTo(50 * SK_Scalar1, 50 * SK_Scalar1);
+ fPaths.back().cubicTo(50 * SK_Scalar1, 50 * SK_Scalar1,
+ 50 * SK_Scalar1, 50 * SK_Scalar1,
+ 50 * SK_Scalar1, 50 * SK_Scalar1);
+
+ // moveTo only paths
+ fPaths.push_back().moveTo(0, 0);
+ fPaths.back().moveTo(0, 0);
+ fPaths.back().moveTo(SK_Scalar1, SK_Scalar1);
+ fPaths.back().moveTo(SK_Scalar1, SK_Scalar1);
+ fPaths.back().moveTo(10 * SK_Scalar1, 10 * SK_Scalar1);
+
+ fPaths.push_back().moveTo(0, 0);
+ fPaths.back().moveTo(0, 0);
+
+ // line degenerate
+ fPaths.push_back().lineTo(100 * SK_Scalar1, 100 * SK_Scalar1);
+ fPaths.push_back().quadTo(100 * SK_Scalar1, 100 * SK_Scalar1, 0, 0);
+ fPaths.push_back().quadTo(100 * SK_Scalar1, 100 * SK_Scalar1,
+ 50 * SK_Scalar1, 50 * SK_Scalar1);
+ fPaths.push_back().quadTo(50 * SK_Scalar1, 50 * SK_Scalar1,
+ 100 * SK_Scalar1, 100 * SK_Scalar1);
+ fPaths.push_back().cubicTo(0, 0,
+ 0, 0,
+ 100 * SK_Scalar1, 100 * SK_Scalar1);
+
+ // small circle. This is listed last so that it has device coords far
+ // from the origin (small area relative to x,y values).
+ fPaths.push_back().addCircle(0, 0, SkFloatToScalar(0.8f));
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ SkRandom rand;
+ canvas->translate(20 * SK_Scalar1, 20 * SK_Scalar1);
+ for (int i = 0; i < fPaths.count(); ++i) {
+ canvas->save();
+ // position the path, and make it at off-integer coords.
+ canvas->translate(SK_Scalar1 * 200 * (i % 5) + SK_Scalar1 / 4,
+ SK_Scalar1 * 200 * (i / 5) + 3 * SK_Scalar1 / 4);
+ SkColor color = rand.nextU();
+ color |= 0xff000000;
+ paint.setColor(color);
+ SkASSERT(fPaths[i].isConvex());
+ canvas->drawPath(fPaths[i], paint);
+ canvas->restore();
+ }
+ }
+
+private:
+ typedef GM INHERITED;
+ SkTArray<SkPath> fPaths;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new ConvexPathsGM; }
+static GMRegistry reg(MyFactory);
+
+}
+
generated by cgit v1.1 at 2024-12-22 13:52:08 +0000