@egjs/axes
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A module used to change the information of user action entered by various input devices such as touch screen or mouse into the logical virtual coordinates. You can easily create a UI that responds to user actions.
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/*
* Copyright (c) 2015 NAVER Corp.
* egjs projects are licensed under the MIT license
*/
import { isOutside, getCirculatedPos } from "./Coordinate";
import { map, filter, every } from "./utils";
import { ObjectInterface } from "./types";
export interface Axis {
[key: string]: number;
}
export interface AxisOption {
range?: number[];
bounce?: number | number[];
circular?: boolean | boolean[];
startPos?: number;
}
export class AxisManager {
private _pos: Axis;
public constructor(private _axis: ObjectInterface<AxisOption>) {
this._complementOptions();
this._pos = Object.keys(this._axis).reduce((pos, v) => {
pos[v] = this._axis[v].startPos;
return pos;
}, {});
}
public getDelta(depaPos: Axis, destPos: Axis): Axis {
const fullDepaPos = this.get(depaPos);
return map(this.get(destPos), (v, k) => v - fullDepaPos[k]);
}
public get(axes?: string[] | Axis): Axis {
if (axes && Array.isArray(axes)) {
return axes.reduce((acc, v) => {
if (v && v in this._pos) {
acc[v] = this._pos[v];
}
return acc;
}, {});
} else {
return { ...this._pos, ...((axes || {}) as Axis) };
}
}
public moveTo(pos: Axis, depaPos: Axis = this._pos): { [key: string]: Axis } {
const delta = map(this._pos, (v, key) => {
return key in pos && key in depaPos ? pos[key] - depaPos[key] : 0;
});
this.set(
this.map(pos, (v, opt) =>
opt ? getCirculatedPos(v, opt.range, opt.circular as boolean[]) : 0
)
);
return {
pos: { ...this._pos },
delta,
};
}
public set(pos: Axis) {
for (const k in pos) {
if (k && k in this._pos) {
this._pos[k] = pos[k];
}
}
}
public every(
pos: Axis,
callback: (value: number, options: AxisOption, key: string) => boolean
): boolean {
const axisOptions = this._axis;
return every(pos, (value, key) => callback(value, axisOptions[key], key));
}
public filter(
pos: Axis,
callback: (value: number, options: AxisOption, key: string) => boolean
): Axis {
const axisOptions = this._axis;
return filter(pos, (value, key) => callback(value, axisOptions[key], key));
}
public map<U>(
pos: Axis,
callback: (value: number, options: AxisOption, key: string) => U
) {
const axisOptions = this._axis;
return map<number, U>(pos, (value, key) =>
callback(value, axisOptions[key], key)
);
}
public isOutside(axes?: string[]) {
return !this.every(
axes ? this.get(axes) : this._pos,
(v, opt) => !isOutside(v, opt.range)
);
}
public getAxisOptions(key: string) {
return this._axis[key];
}
public setAxis(axis: ObjectInterface<AxisOption>) {
Object.keys(axis).forEach((key) => {
<span class="missing-if-branch" title="if path not taken" >I</span>if (!this._axis[key]) {
<span class="cstat-no" title="statement not covered" > throw new Error(`Axis ${key} does not exist in Axes instance`);</span>
}
this._axis[key] = {
...this._axis[key],
...axis[key],
};
});
this._complementOptions();
}
/**
* set up 'css' expression
* @private
*/
private _complementOptions() {
Object.keys(this._axis).forEach((axis) => {
this._axis[axis] = {
...{
range: [0, 100],
startPos: this._axis[axis].range[0],
bounce: [0, 0],
circular: [false, false],
},
...this._axis[axis],
};
["bounce", "circular"].forEach((v) => {
const axisOption = this._axis;
const key = axisOption[axis][v];
if (/string|number|boolean/.test(typeof key)) {
axisOption[axis][v] = [key, key];
}
});
});
}
}
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