add gm for dashing variations

git-svn-id: http://skia.googlecode.com/svn/trunk@3842 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 80 insertions, 0 deletions

diff --git a/gm/dashing.cpp b/gm/dashing.cpp
new file mode 100644
index 0000000000..2be32bf196
--- /dev/null
+++ b/gm/dashing.cpp
@@ -0,0 +1,80 @@
+/*
+ * 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 "SkPaint.h"
+#include "SkDashPathEffect.h"
+
+static void drawline(SkCanvas* canvas, int on, int off, const SkPaint& paint) {
+    SkPaint p(paint);
+
+    const SkScalar intervals[] = {
+        SkIntToScalar(on),
+        SkIntToScalar(off),
+    };
+
+    p.setPathEffect(new SkDashPathEffect(intervals, 2, 0))->unref();
+    canvas->drawLine(0, 0, SkIntToScalar(600), 0, p);
+}
+
+namespace skiagm {
+
+class DashingGM : public GM {
+public:
+    DashingGM() {}
+
+protected:
+    SkString onShortName() {
+        return SkString("dashing");
+    }
+
+    SkISize onISize() { return make_isize(640, 300); }
+
+    virtual void onDraw(SkCanvas* canvas) {
+        static const struct {
+            int fOnInterval;
+            int fOffInterval;
+        } gData[] = {
+            { 1, 1 },
+            { 4, 1 },
+        };
+        
+        SkPaint paint;
+        paint.setStyle(SkPaint::kStroke_Style);
+
+        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
+        canvas->translate(0, SK_ScalarHalf);
+
+        for (int width = 0; width <= 2; ++width) {
+            for (size_t data = 0; data < SK_ARRAY_COUNT(gData); ++data) {
+                for (int aa = 0; aa <= 1; ++aa) {
+                    int w = width * width * width;
+                    paint.setAntiAlias(SkToBool(aa));
+                    paint.setStrokeWidth(SkIntToScalar(w));
+                    
+                    int scale = w ? w : 1;
+
+                    drawline(canvas, gData[data].fOnInterval * scale,
+                             gData[data].fOffInterval * scale,
+                             paint);
+                    canvas->translate(0, SkIntToScalar(20));
+                }
+            }
+        }
+    }
+
+private:
+    typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* gF(void*) { return new DashingGM; }
+static GMRegistry gR(gF);
+
+}