zrender/lib/graphic/helper/subPixelOptimize.js

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;
}