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import {point} from "./cardinal.js";
export function CardinalOpen(context, tension) {
this._context = context;
this._k = (1 - tension) / 6;
}
CardinalOpen.prototype = {
areaStart: function() {
this._line = 0;
},
areaEnd: function() {
this._line = NaN;
},
lineStart: function() {
this._x0 = this._x1 = this._x2 =
this._y0 = this._y1 = this._y2 = NaN;
this._point = 0;
},
lineEnd: function() {
if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
this._line = 1 - this._line;
},
point: function(x, y) {
x = +x, y = +y;
switch (this._point) {
case 0: this._point = 1; break;
case 1: this._point = 2; break;
case 2: this._point = 3; this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2); break;
case 3: this._point = 4; // falls through
default: point(this, x, y); break;
}
this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
}
};
export default (function custom(tension) {
function cardinal(context) {
return new CardinalOpen(context, tension);
}
cardinal.tension = function(tension) {
return custom(+tension);
};
return cardinal;
})(0);
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