Skia Fiddle

Options

Width Height

check_box_outline_blank check_box Text Only [Use SkDebugf()]

check_box_outline_blank check_box sRGB

check_box_outline_blank check_box F16

check_box_outline_blank check_box Animation

check_box_outline_blank check_box Offscreen Render Target

Width Height Sample Count

check_box_outline_blank check_box Texturable

check_box_outline_blank check_box MipMap

This global is now defined:

GrBackendRenderTarget backEndRenderTarget;

GrBackendTexture backEndTextureRenderTarget;

Optional source image

check_box_outline_blank check_box MipMap

These globals are now defined:

SkBitmap source;
sk_sp<SkImage> image;
GrBackendTexture backEndTexture; // GPU Only.

Note:

Adding comments with SK_FOLD_START and SK_FOLD_END creates foldable code blocks.
These blocks will be folded by default and are useful for highlighting specific lines of code.
You can also use the keyboard shortcuts Ctrl+S and Ctrl+E in the code editor to set them.

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void draw(SkCanvas* canvas) {
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setStyle(SkPaint::kStroke_Style);
    SkMatrix matrix;
    const SkPoint center = {128, 103};
    matrix.setScale(2, .5f, center.fX, center.fY);
    matrix.postRotate(45, center.fX, center.fY);
    const SkScalar circleRadius = 60;
    SkScalar mappedRadius = matrix.mapRadius(circleRadius);
    SkVector minorAxis = matrix.mapVector({0, circleRadius});
    SkVector majorAxis = matrix.mapVector({circleRadius, 0});
    paint.setColor(SK_ColorRED);
    canvas->drawLine(40, 240, 40 + minorAxis.length(), 240, paint);
    canvas->drawLine(42 + minorAxis.length(), 240, 42 + minorAxis.length() + majorAxis.length(),
                     240, 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->drawLine(40, 220, 40 + mappedRadius, 220, paint);
    canvas->drawLine(42 + mappedRadius, 220, 42 + mappedRadius * 2, 220, 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);
}