void
PathBuilderCG::Arc(const Point &aOrigin, Float aRadius, Float aStartAngle,
Float aEndAngle, bool aAntiClockwise)
{
if (!aOrigin.IsFinite() || !IsFinite(aRadius) ||
!IsFinite(aStartAngle) || !IsFinite(aEndAngle)) {
return;
}
// Disabled for now due to a CG bug when using CGPathAddArc with stroke
// dashing and rotation transforms that are multiples of 90 degrees. See:
// https://bugzilla.mozilla.org/show_bug.cgi?id=949661#c8
#if 0
// Core Graphic's initial coordinate system is y-axis up, whereas Moz2D's is
// y-axis down. Core Graphics therefore considers "clockwise" to mean "sweep
// in the direction of decreasing angle" whereas Moz2D considers it to mean
// "sweep in the direction of increasing angle". In other words if this
// Moz2D method is instructed to sweep anti-clockwise we need to tell
// CGPathAddArc to sweep clockwise, and vice versa. Hence why we pass the
// value of aAntiClockwise directly to CGPathAddArc's "clockwise" bool
// parameter.
CGPathAddArc(mCGPath, nullptr,
aOrigin.x, aOrigin.y,
aRadius,
aStartAngle,
aEndAngle,
aAntiClockwise);
#endif
ArcToBezier(this, aOrigin, Size(aRadius, aRadius), aStartAngle, aEndAngle,
aAntiClockwise);
}
void doRotatedEllipsesWithCGPath(CGContextRef context)
{
int i, totreps = 144.;
CGMutablePathRef path = NULL;
float tint = 1., tintIncrement = 1./totreps;
// Create a new transform consisting of a 45 degree rotation.
CGAffineTransform theTransform = CGAffineTransformMakeRotation(M_PI/4);
// Apply a scaling transformation to the transform just created.
theTransform = CGAffineTransformScale(theTransform, 1, 2);
// Create a mutable CGPath object.
path = CGPathCreateMutable();
if(!path){
fprintf(stderr, "Couldn't create path!\n");
return;
}
// Add a circular arc to the CGPath object, transformed
// by an affine transform.
CGPathAddArc(path, &theTransform, 0., 0., 45., 0., 2*M_PI, false);
// Close the CGPath object.
CGPathCloseSubpath(path);
// Place the first ellipse at a good location.
CGContextTranslateCTM(context, 100., 100.);
for (i = 0 ; i < totreps ; i++){
CGContextBeginPath(context);
// Add the CGPath object to the current path in the context.
CGContextAddPath(context, path);
// Set the fill color for this instance of the ellipse.
CGContextSetRGBFillColor(context, tint, 0., 0., 1.);
// Filling the path implicitly closes it.
CGContextFillPath(context);
// Compute the next tint color.
tint -= tintIncrement;
// Move over for the next ellipse.
CGContextTranslateCTM(context, 1, 0.);
}
// Release the path when done with it.
CGPathRelease(path);
}
DRAW_TEST_P(CGContextFillMode, OverlappedEllipses) {
CGContextRef context = GetDrawingContext();
CGRect bounds = GetDrawingBounds();
bounds = CGRectInset(bounds, 16.f, 16.f);
CGFloat width = bounds.size.width;
CGFloat height = bounds.size.height;
CGFloat xstart = bounds.origin.x;
CGFloat ystart = bounds.origin.y;
CGPathDrawingMode fillMode = GetParam();
CGMutablePathRef leftCircles = CGPathCreateMutable();
CGPathMoveToPoint(leftCircles, NULL, xstart + .25 * width + .4 * height, ystart + .5 * height);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .4 * height, 0, M_PI, true);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .4 * height, M_PI, 0, true);
CGPathMoveToPoint(leftCircles, NULL, xstart + .25 * width + .3 * height, ystart + .5 * height);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .3 * height, 0, M_PI, true);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .3 * height, M_PI, 0, true);
CGPathMoveToPoint(leftCircles, NULL, xstart + .25 * width + .2 * height, ystart + .5 * height);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .2 * height, 0, M_PI, true);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .2 * height, M_PI, 0, true);
CGPathMoveToPoint(leftCircles, NULL, xstart + .25 * width + .1 * height, ystart + .5 * height);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .1 * height, 0, M_PI, true);
CGPathAddArc(leftCircles, NULL, xstart + .25 * width, ystart + .5 * height, .1 * height, M_PI, 0, true);
CGPathCloseSubpath(leftCircles);
CGMutablePathRef rightCircles = CGPathCreateMutable();
CGPathMoveToPoint(rightCircles, NULL, xstart + .75 * width + .4 * height, ystart + .5 * height);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .4 * height, 0, M_PI, false);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .4 * height, M_PI, 0, false);
CGPathMoveToPoint(rightCircles, NULL, xstart + .75 * width + .3 * height, ystart + .5 * height);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .3 * height, 0, M_PI, true);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .3 * height, M_PI, 0, true);
CGPathMoveToPoint(rightCircles, NULL, xstart + .75 * width + .2 * height, ystart + .5 * height);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .2 * height, 0, M_PI, false);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .2 * height, M_PI, 0, false);
CGPathMoveToPoint(rightCircles, NULL, xstart + .75 * width + .1 * height, ystart + .5 * height);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .1 * height, 0, M_PI, true);
CGPathAddArc(rightCircles, NULL, xstart + .75 * width, ystart + .5 * height, .1 * height, M_PI, 0, true);
CGPathCloseSubpath(rightCircles);
CGContextAddPath(context, leftCircles);
CGContextAddPath(context, rightCircles);
CGContextSetRGBFillColor(context, 0, 0, 1, 1);
CGContextSetRGBStrokeColor(context, 1, 0, 0, 1);
CGContextDrawPath(context, fillMode);
CGPathRelease(leftCircles);
CGPathRelease(rightCircles);
}
void Path::addArc(const FloatPoint& p, float r, float sa, float ea, bool clockwise)
{
// Workaround for <rdar://problem/5189233> CGPathAddArc hangs or crashes when passed inf as start or end angle
if (isfinite(sa) && isfinite(ea))
CGPathAddArc(m_path, 0, p.x(), p.y(), r, sa, ea, clockwise);
}
