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Fix ViewBox, images, transforms, and, gradients; on ios.

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Make getContextWidth/Height and setupGlyphContext take clip bounding box and affine transform matrix into consideration.
This commit is contained in:
Mikael Sand
2017-08-16 19:06:23 +03:00
parent f1657d9ddf
commit 3cafc34cb2
9 changed files with 200 additions and 133 deletions
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ios/Utils/RNSVGViewBox.m
+29 -28
View File
@@ -15,41 +15,40 @@
+ (CGAffineTransform)getTransform:(CGRect)vbRect eRect:(CGRect)eRect align:(NSString *)align meetOrSlice:(RNSVGVBMOS)meetOrSlice fromSymbol:(BOOL)fromSymbol
{
// based on https://svgwg.org/svg2-draft/coords.html#ComputingAViewportsTransform
// Let vb-x, vb-y, vb-width, vb-height be the min-x, min-y, width and height values of the viewBox attribute respectively.
CGFloat vbX = CGRectGetMinX(vbRect);
CGFloat vbY = CGRectGetMinY(vbRect);
CGFloat vbWidth = CGRectGetWidth(vbRect);
CGFloat vbHeight = CGRectGetHeight(vbRect);
// Let e-x, e-y, e-width, e-height be the position and size of the element respectively.
CGFloat eX = CGRectGetMinX(eRect);
CGFloat eY = CGRectGetMinY(eRect);
CGFloat eWidth = CGRectGetWidth(eRect);
CGFloat eHeight = CGRectGetHeight(eRect);
// Let align be the align value of preserveAspectRatio, or 'xMidyMid' if preserveAspectRatio is not defined.
// Let meetOrSlice be the meetOrSlice value of preserveAspectRatio, or 'meet' if preserveAspectRatio is not defined or if meetOrSlice is missing from this value.
// Initialize scale-x to e-width/vb-width.
CGFloat scaleX = eWidth / vbWidth;
// Initialize scale-y to e-height/vb-height.
CGFloat scaleY = eHeight / vbHeight;
// Initialize translate-x to vb-x - e-x.
// Initialize translate-y to vb-y - e-y.
CGFloat translateX = vbX - eX;
CGFloat translateY = vbY - eY;
// Initialize translate-x to e-x - (vb-x * scale-x).
// Initialize translate-y to e-y - (vb-y * scale-y).
CGFloat translateX = eX - (vbX * scaleX);
CGFloat translateY = eY - (vbY * scaleY);
// If align is 'none'
if (meetOrSlice == kRNSVGVBMOSNone) {
// Let scale be set the smaller value of scale-x and scale-y.
// Assign scale-x and scale-y to scale.
CGFloat scale = scaleX = scaleY = fmin(scaleX, scaleY);
// If scale is greater than 1
if (scale > 1) {
// Minus translateX by (eWidth / scale - vbWidth) / 2
@@ -68,30 +67,32 @@
} else if (![align isEqualToString: @"none"] && meetOrSlice == kRNSVGVBMOSSlice) {
scaleX = scaleY = fmax(scaleX, scaleY);
}
// If align contains 'xMid', minus (e-width / scale-x - vb-width) / 2 from transform-x.
// If align contains 'xMid', add (e-width - vb-width * scale-x) / 2 to translate-x.
if ([align containsString:@"xMid"]) {
translateX -= (eWidth / scaleX - vbWidth) / 2;
translateX += (eWidth - vbWidth * scaleX) / 2.0;
}
// If align contains 'xMax', minus (e-width / scale-x - vb-width) from transform-x.
// If align contains 'xMax', add (e-width - vb-width * scale-x) to translate-x.
if ([align containsString:@"xMax"]) {
translateX -= eWidth / scaleX - vbWidth;
translateX += (eWidth - vbWidth * scaleX);
}
// If align contains 'yMid', minus (e-height / scale-y - vb-height) / 2 from transform-y.
// If align contains 'yMid', add (e-height - vb-height * scale-y) / 2 to translate-y.
if ([align containsString:@"YMid"]) {
translateY -= (eHeight / scaleY - vbHeight) / 2;
translateY += (eHeight - vbHeight * scaleY) / 2.0;
}
// If align contains 'yMax', minus (e-height / scale-y - vb-height) from transform-y.
// If align contains 'yMax', add (e-height - vb-height * scale-y) to translate-y.
if ([align containsString:@"YMax"]) {
translateY -= eHeight / scaleY - vbHeight;
translateY += (eHeight - vbHeight * scaleY);
}
}
// The transform applied to content contained by the element is given by
// translate(translate-x, translate-y) scale(scale-x, scale-y).
CGAffineTransform transform = CGAffineTransformMakeScale(scaleX, scaleY);
return CGAffineTransformTranslate(transform, -translateX * (fromSymbol ? scaleX : 1), -translateY * (fromSymbol ? scaleY : 1));
return CGAffineTransformTranslate(transform, translateX, translateY);
}
@end