Compile all fiddle examples locally
Motivation: it would be a good idea if the API documentation examples
were checked into the skia repository, so we could make sure they
compile as part of the commit queue.
Fiddle would make/update a named fiddle each time it gets a new
commit of Skia, extracted from the code in the examples/ directory.
The docs would point at those named fiddles. Named fiddles have urls
in the form:
https://fiddle.skia.org/c/@Bitmap_000
Then we would stick a link to the example into the header documentation
like this:
/** Allocates the pixel memory for the bitmap, given its dimensions
and SkColorType. Returns true on success, where success means
either setPixels() or setPixelRef() was called.
@param bitmap SkBitmap containing SkImageInfo as input, and
SkPixelRef as output
@return true if SkPixelRef was allocated
@example https://fiddle.skia.org/c/@Bitmap_000
*/
bool allocPixelRef(SkBitmap* bitmap) override;
There are still around 200 disabled examples that need to be fixed
(these result from API changes since the author left).
Change-Id: I14a31348a9ccaaa31f65424b91e3a3533d2583a7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/198824
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
diff --git a/docs/examples/Matrix_091.cpp b/docs/examples/Matrix_091.cpp
new file mode 100644
index 0000000..7ba6495
--- /dev/null
+++ b/docs/examples/Matrix_091.cpp
@@ -0,0 +1,41 @@
+#if 0 // Disabled until updated to use current API.
+// Copyright 2019 Google LLC.
+// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+#include "fiddle/examples.h"
+// HASH=6d6f2082fcf59d9f02bfb1758b87db69
+REG_FIDDLE(Matrix_091, 256, 256, false, 0) {
+void draw(SkCanvas* canvas) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ SkMatrix matrix;
+ const SkPoint center = {108, 93};
+ matrix.setScale(2, .5f, center.fX, center.fY);
+ matrix.postRotate(45, center.fX, center.fY);
+ const SkScalar circleRadius = 50;
+ SkScalar mappedRadius = matrix.mapRadius(circleRadius);
+ SkVector minorAxis, majorAxis;
+ matrix.mapVector(0, circleRadius, &minorAxis);
+ matrix.mapVector(circleRadius, 0, &majorAxis);
+ SkString mappedArea;
+ mappedArea.printf("area = %g", mappedRadius * mappedRadius);
+ canvas->drawString(mappedArea, 145, 250, paint);
+ canvas->drawString("mappedRadius", center.fX + mappedRadius + 3, center.fY, paint);
+ paint.setColor(SK_ColorRED);
+ SkString axArea;
+ axArea.printf("area = %g", majorAxis.length() * minorAxis.length());
+ paint.setStyle(SkPaint::kFill_Style);
+ canvas->drawString(axArea, 15, 250, paint);
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawRect({10, 200, 10 + majorAxis.length(), 200 + minorAxis.length()}, paint);
+ paint.setColor(SK_ColorBLACK);
+ canvas->drawLine(center.fX, center.fY, center.fX + mappedRadius, center.fY, paint);
+ canvas->drawLine(center.fX, center.fY, center.fX, center.fY + mappedRadius, paint);
+ canvas->drawRect({140, 180, 140 + mappedRadius, 180 + mappedRadius}, paint);
+ canvas->concat(matrix);
+ canvas->drawCircle(center.fX, center.fY, circleRadius, paint);
+ paint.setColor(SK_ColorRED);
+ canvas->drawLine(center.fX, center.fY, center.fX + circleRadius, center.fY, paint);
+ canvas->drawLine(center.fX, center.fY, center.fX, center.fY + circleRadius, paint);
+}
+} // END FIDDLE
+#endif // Disabled until updated to use current API.