Function drawBackground

libs/echarts/echarts-en.simple.js:8772–8835

(hostEl, ctx, style, x, y, width, height)

// style: {textBackgroundColor, textBorderWidth, textBorderColor, textBorderRadius, text}
// shape: {x, y, width, height}
function drawBackground(hostEl, ctx, style, x, y, width, height) {
    var textBackgroundColor = style.textBackgroundColor;
    var textBorderWidth = style.textBorderWidth;
    var textBorderColor = style.textBorderColor;
    var isPlainBg = isString(textBackgroundColor);

    setCtx(ctx, 'shadowBlur', style.textBoxShadowBlur || 0);
    setCtx(ctx, 'shadowColor', style.textBoxShadowColor || 'transparent');
    setCtx(ctx, 'shadowOffsetX', style.textBoxShadowOffsetX || 0);
    setCtx(ctx, 'shadowOffsetY', style.textBoxShadowOffsetY || 0);

    if (isPlainBg || (textBorderWidth && textBorderColor)) {
        ctx.beginPath();
        var textBorderRadius = style.textBorderRadius;
        if (!textBorderRadius) {
            ctx.rect(x, y, width, height);
        }
        else {
            buildPath(ctx, {
                x: x, y: y, width: width, height: height, r: textBorderRadius
            });
        }
        ctx.closePath();
    }

    if (isPlainBg) {
        setCtx(ctx, 'fillStyle', textBackgroundColor);

        if (style.fillOpacity != null) {
            var originalGlobalAlpha = ctx.globalAlpha;
            ctx.globalAlpha = style.fillOpacity * style.opacity;
            ctx.fill();
            ctx.globalAlpha = originalGlobalAlpha;
        }
        else {
            ctx.fill();
        }
    }
    else if (isObject$1(textBackgroundColor)) {
        var image = textBackgroundColor.image;

        image = createOrUpdateImage(
            image, null, hostEl, onBgImageLoaded, textBackgroundColor
        );
        if (image && isImageReady(image)) {
            ctx.drawImage(image, x, y, width, height);
        }
    }

    if (textBorderWidth && textBorderColor) {
        setCtx(ctx, 'lineWidth', textBorderWidth);
        setCtx(ctx, 'strokeStyle', textBorderColor);

        if (style.strokeOpacity != null) {
            var originalGlobalAlpha = ctx.globalAlpha;
            ctx.globalAlpha = style.strokeOpacity * style.opacity;
            ctx.stroke();
            ctx.globalAlpha = originalGlobalAlpha;