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import {string, number} from "./mark.js";

export function Style(mark, {

fill,

fillOpacity,

stroke,

strokeWidth,

strokeOpacity,

strokeLinejoin,

strokeLinecap,

strokeMiterlimit,

strokeDasharray,

mixBlendMode

} = {}) {

mark.fill = impliedString(fill, "currentColor");

mark.fillOpacity = impliedNumber(fillOpacity, 1);

mark.stroke = impliedString(stroke, "none");

mark.strokeWidth = impliedNumber(strokeWidth, 1);

mark.strokeOpacity = impliedNumber(strokeOpacity, 1);

mark.strokeLinejoin = impliedString(strokeLinejoin, "miter");

mark.strokeLinecap = impliedString(strokeLinecap, "butt");

mark.strokeMiterlimit = impliedNumber(strokeMiterlimit, 1);

mark.strokeDasharray = string(strokeDasharray);

mark.mixBlendMode = impliedString(mixBlendMode, "normal");

}

export function applyIndirectStyles(selection, mark) {

applyAttr(selection, "fill", mark.fill);

applyAttr(selection, "fill-opacity", mark.fillOpacity);

applyAttr(selection, "stroke", mark.stroke);

applyAttr(selection, "stroke-width", mark.strokeWidth);

applyAttr(selection, "stroke-opacity", mark.strokeOpacity);

applyAttr(selection, "stroke-linejoin", mark.strokeLinejoin);

applyAttr(selection, "stroke-linecap", mark.strokeLinecap);

applyAttr(selection, "stroke-miterlimit", mark.strokeMiterlimit);

applyAttr(selection, "stroke-dasharray", mark.strokeDasharray);

}

export function applyDirectStyles(selection, mark) {

applyStyle(selection, "mix-blend-mode", mark.mixBlendMode);

}

export function applyAttr(selection, name, value) {

if (value != null) selection.attr(name, value);

}

export function applyStyle(selection, name, value) {

if (value != null) selection.style(name, value);

}

export function applyTransform(selection, x, y, tx = 0, ty = 0) {

if (x.bandwidth) tx += x.bandwidth() / 2;

if (y.bandwidth) ty += y.bandwidth() / 2;

selection.attr("transform", `translate(${tx},${ty})`);

}

function impliedString(value, impliedValue) {

if ((value = string(value)) !== impliedValue) return value;

}

function impliedNumber(value, impliedValue) {

if ((value = number(value)) !== impliedValue) return value;

}

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