public void RCTUIGraphicsBeginImageContext(CGSize size, Color backgroundColor, bool hasCornerRadii, bool drawToEdge)
{
/// create cairo surface and context here
surface = Cairo.cairo_image_surface_create(0, 1920, 1080);
cairo = Cairo.cairo_create(surface);
/* clear background as white */
Cairo.cairo_set_source_rgba(cairo, 1, 1, 1, 1);
Cairo.cairo_paint(cairo);
// set default stroke line width and color for Cairo context
Cairo.cairo_set_line_width(cairo, 1.0);
Cairo.cairo_set_source_rgba(cairo, 0, 0, 0, 1); //black line
}
void RCTGetSolidBorderImage(RCTCornerRadii cornerRadii,
CGSize viewSize,
UIEdgeInsets borderInsets,
RCTBorderColors borderColors,
//uint backgroundColor,
Color backgroundColor,
bool drawToEdge)
{
bool hasCornerRadii = RCTCornerRadiiAreAboveThreshold(cornerRadii);
RCTCornerInsets cornerInsets = RCTGetCornerInsets(cornerRadii, borderInsets);
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::RCTGetSolidBorderImage BGN ");
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , hasCornerRadii:" + hasCornerRadii);
bool makeStretchable =
(borderInsets.left + cornerInsets.topLeft.width +
borderInsets.right + cornerInsets.bottomRight.width <= viewSize.width) &&
(borderInsets.left + cornerInsets.bottomLeft.width +
borderInsets.right + cornerInsets.topRight.width <= viewSize.width) &&
(borderInsets.top + cornerInsets.topLeft.height +
borderInsets.bottom + cornerInsets.bottomRight.height <= viewSize.height) &&
(borderInsets.top + cornerInsets.topRight.height +
borderInsets.bottom + cornerInsets.bottomLeft.height <= viewSize.height);
UIEdgeInsets edgeInsets = new UIEdgeInsets
(
borderInsets.top + Math.Max(cornerInsets.topLeft.height, cornerInsets.topRight.height),
borderInsets.left + Math.Max(cornerInsets.topLeft.width, cornerInsets.bottomLeft.width),
borderInsets.bottom + Math.Max(cornerInsets.bottomLeft.height, cornerInsets.bottomRight.height),
borderInsets.right + Math.Max(cornerInsets.bottomRight.width, cornerInsets.topRight.width)
);
makeStretchable = false;
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , makeStretchable:" + makeStretchable);
CGSize sizeStretch = new CGSize
(
// 1pt for the middle stretchable area along each axis
edgeInsets.left + 1 + edgeInsets.right,
edgeInsets.top + 1 + edgeInsets.bottom
);
//CGSize size = makeStretchable ? sizeStretch: viewSize;
CGSize size = viewSize;
// begin libCairo engine drawing context
RCTUIGraphicsBeginImageContext(size, backgroundColor, hasCornerRadii, drawToEdge);
CGRect rect = new CGRect((new CGPoint(0, 0)), size);
RCTPathCreateOuterOutline(drawToEdge, rect, cornerRadii);
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager , backgroundColor.IsDefault:" + backgroundColor.IsDefault);
if (!backgroundColor.IsDefault)
{
// paint the background color here
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::Fill the background Color! ");
RCTContextSetFillColorWithColor(cairo, backgroundColor);
//RCTContextSetFillColorWithUint(cairo, backgroundColor);
Cairo.cairo_fill(cairo);
}
// for Cairo instead, draw rounded Rectangle path here
Cairo.cairo_append_path(cairo, pathOuter);
pathInner = RCTPathCreateWithRoundedRect(UIEdgeInsetsInsetRect(rect, borderInsets), cornerInsets);
//Cairo.cairo_append_path(cairo, pathInner);
/// Clip the outerpath with inner path by eod rule..
Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_EVEN_ODD);
//Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_WINDING);
Cairo.cairo_clip(cairo);
RCTContextSetFillColorWithUint(cairo, borderColors.left);
Cairo.cairo_paint(cairo);
bool hasEqualColors = RCTBorderColorsAreEqual(borderColors);
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] drawToEdge:" + drawToEdge + ", hasCornerRadii:" + hasCornerRadii + ", hasEqualColors:" + hasEqualColors);
if ((drawToEdge || !hasCornerRadii) && hasEqualColors)
{
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] rect.origin.x:" + rect.origin.x + ", rect.origin.y:" + rect.origin.y + ", rect.size.width:" + rect.size.width + ", rect.size.height:" + rect.size.height);
RCTContextSetFillColorWithUint(cairo, borderColors.left);
Cairo.cairo_paint(cairo);
}
else
{
if ((hasCornerRadii))
{
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager-->not support different color for rounded rectangle! ");
RCTContextSaveCurrentImage();
return;
}
CGPoint topLeft = new CGPoint(borderInsets.left, borderInsets.top);
if (cornerInsets.topLeft.width > 0 && cornerInsets.topLeft.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect tl = new CGRect
(
topLeft, new CGSize(2 * cornerInsets.topLeft.width, 2 * cornerInsets.topLeft.height)
);
RCTEllipseGetIntersectionsWithLine(tl, CGPointZero, topLeft, points);
if (!Single.IsNaN(points[1].x) && !Single.IsNaN(points[1].y))
{
topLeft = points[1];
}
}
CGPoint bottomLeft = new CGPoint(borderInsets.left, size.height - borderInsets.bottom);
if (cornerInsets.bottomLeft.width > 0 && cornerInsets.bottomLeft.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect bl = new CGRect
(
new CGPoint(bottomLeft.x, bottomLeft.y - 2 * cornerInsets.bottomLeft.height),
new CGSize(2 * cornerInsets.bottomLeft.width, 2 * cornerInsets.bottomLeft.height)
);
CGPoint ble = new CGPoint(0, size.height);
RCTEllipseGetIntersectionsWithLine(bl, ble, bottomLeft, points);
if (!Single.IsNaN(points[1].x) && !Single.IsNaN(points[1].y))
{
bottomLeft = points[1];
}
}
CGPoint topRight = new CGPoint(size.width - borderInsets.right, borderInsets.top);
if (cornerInsets.topRight.width > 0 && cornerInsets.topRight.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect tr = new CGRect
(
new CGPoint(topRight.x - 2 * cornerInsets.topRight.width, topRight.y),
new CGSize(2 * cornerInsets.topRight.width, 2 * cornerInsets.topRight.height)
);
CGPoint tre = new CGPoint(size.width, 0);
RCTEllipseGetIntersectionsWithLine(tr, tre, topRight, points);
if (!Single.IsNaN(points[0].x) && !Single.IsNaN(points[0].y))
{
topRight = points[0];
}
}
CGPoint bottomRight = new CGPoint(size.width - borderInsets.right, size.height - borderInsets.bottom);
if (cornerInsets.bottomRight.width > 0 && cornerInsets.bottomRight.height > 0)
{
CGPoint[] points = new CGPoint[2];
CGRect br = new CGRect
(
new CGPoint(bottomRight.x - 2 * cornerInsets.bottomRight.width, bottomRight.y - 2 * cornerInsets.bottomRight.height),
new CGSize(2 * cornerInsets.bottomRight.width, 2 * cornerInsets.bottomRight.height)
);
CGPoint bre = new CGPoint(size.width, size.height);
RCTEllipseGetIntersectionsWithLine(br, bre, bottomRight, points);
if (!Single.IsNaN(points[0].x) && !Single.IsNaN(points[0].y))
{
bottomRight = points[0];
}
}
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] ReactBorderDrawingManager::RCTGetSolidBorderImage BGN Draw each colored Edge!");
Log.Info(ReactConstants.Tag, "[RCTGetSolidBorderImage] borderInsets.right:" + borderInsets.right + ", borderInsets.bottom:" + borderInsets.bottom + ", borderInsets.left:" + borderInsets.left + ", borderInsets.top:" + borderInsets.top);
uint currentColor = 0;
//Cairo.cairo_set_fill_rule(cairo, Cairo.cairo_fill_rule_t.CAIRO_FILL_RULE_WINDING);
// RIGHT
if (borderInsets.right > 0)
{
CGPoint[] points =
{
new CGPoint(size.width, 0),
topRight,
bottomRight,
new CGPoint(size.width, size.height),
};
currentColor = borderColors.right;
RCTContextAddLines(cairo, points, 4);
}
// BOTTOM
if (borderInsets.bottom > 0)
{
CGPoint[] points =
{
new CGPoint(0, size.height),
bottomLeft,
bottomRight,
new CGPoint(size.width, size.height),
};
if (!(currentColor == borderColors.bottom))
{
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
currentColor = borderColors.bottom;
}
RCTContextAddLines(cairo, points, 4);
}
// LEFT
if (borderInsets.left > 0)
{
CGPoint[] points =
{
CGPointZero,
topLeft,
bottomLeft,
new CGPoint(0,size.height),
};
if (!(currentColor == borderColors.left))
{
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
currentColor = borderColors.left;
}
RCTContextAddLines(cairo, points, 4);
}
// TOP
if (borderInsets.top > 0)
{
CGPoint[] points =
{
CGPointZero,
topLeft,
topRight,
new CGPoint(size.width, 0),
};
if (!(currentColor == borderColors.top))
{
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
currentColor = borderColors.top;
}
RCTContextAddLines(cairo, points, 4);
}
RCTContextSetFillColorWithUint(cairo, currentColor);
Cairo.cairo_fill(cairo);
}
RCTContextSaveCurrentImage();
return;
}