bd028579
 易尊强
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var round = Math.round;
export function subPixelOptimizeLine(outputShape, inputShape, style) {
if (!inputShape) {
return;
}
var x1 = inputShape.x1;
var x2 = inputShape.x2;
var y1 = inputShape.y1;
var y2 = inputShape.y2;
outputShape.x1 = x1;
outputShape.x2 = x2;
outputShape.y1 = y1;
outputShape.y2 = y2;
var lineWidth = style && style.lineWidth;
if (!lineWidth) {
return outputShape;
}
if (round(x1 * 2) === round(x2 * 2)) {
outputShape.x1 = outputShape.x2 = subPixelOptimize(x1, lineWidth, true);
}
if (round(y1 * 2) === round(y2 * 2)) {
outputShape.y1 = outputShape.y2 = subPixelOptimize(y1, lineWidth, true);
}
return outputShape;
}
export function subPixelOptimizeRect(outputShape, inputShape, style) {
if (!inputShape) {
return;
}
var originX = inputShape.x;
var originY = inputShape.y;
var originWidth = inputShape.width;
var originHeight = inputShape.height;
outputShape.x = originX;
outputShape.y = originY;
outputShape.width = originWidth;
outputShape.height = originHeight;
var lineWidth = style && style.lineWidth;
if (!lineWidth) {
return outputShape;
}
outputShape.x = subPixelOptimize(originX, lineWidth, true);
outputShape.y = subPixelOptimize(originY, lineWidth, true);
outputShape.width = Math.max(subPixelOptimize(originX + originWidth, lineWidth, false) - outputShape.x, originWidth === 0 ? 0 : 1);
outputShape.height = Math.max(subPixelOptimize(originY + originHeight, lineWidth, false) - outputShape.y, originHeight === 0 ? 0 : 1);
return outputShape;
}
export function subPixelOptimize(position, lineWidth, positiveOrNegative) {
if (!lineWidth) {
return position;
}
var doubledPosition = round(position * 2);
return (doubledPosition + round(lineWidth)) % 2 === 0
? doubledPosition / 2
: (doubledPosition + (positiveOrNegative ? 1 : -1)) / 2;
}
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