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export function Transform(k, x, y) {
this.k = k;
this.x = x;
this.y = y;
}
Transform.prototype = {
constructor: Transform,
scale: function(k) {
return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
},
translate: function(x, y) {
return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
},
apply: function(point) {
return [point[0] * this.k + this.x, point[1] * this.k + this.y];
},
applyX: function(x) {
return x * this.k + this.x;
},
applyY: function(y) {
return y * this.k + this.y;
},
invert: function(location) {
return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
},
invertX: function(x) {
return (x - this.x) / this.k;
},
invertY: function(y) {
return (y - this.y) / this.k;
},
rescaleX: function(x) {
return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
},
rescaleY: function(y) {
return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
},
toString: function() {
return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
}
};
export var identity = new Transform(1, 0, 0);
transform.prototype = Transform.prototype;
export default function transform(node) {
while (!node.__zoom) if (!(node = node.parentNode)) return identity;
return node.__zoom;
}