@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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<a href="../index.html">All files</a> / <a href="index.html">src</a> Coordinate.ts
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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
*/
export const getInsidePosition = (
destPos: number,
range: number[],
circular: boolean[],
bounce?: number[]
): number => {
let toDestPos: number = destPos;
const targetRange: number[] = [
circular[0] ? range[0] : bounce ? range[0] - bounce[0] : range[0],
circular[1] ? range[1] : bounce ? range[1] + bounce[1] : range[1],
];
toDestPos = Math.max(targetRange[0], toDestPos);
toDestPos = Math.min(targetRange[1], toDestPos);
return toDestPos;
};
// determine outside
export const isOutside = (pos: number, range: number[]): boolean => {
return pos < range[0] || pos > range[1];
};
// determine whether position has reached the maximum moveable area
export const isEndofBounce = (
pos: number,
range: number[],
bounce: number[],
circular: boolean[]
): boolean => {
return (
(!circular[0] && pos === range[0] - bounce[0]) ||
(!circular[1] && pos === range[1] + bounce[1])
);
};
export const getDuration = (distance: number, deceleration): number => {
const duration = Math.sqrt((distance / deceleration) * 2);
// when duration is under 100, then value is zero
return duration < 100 ? 0 : duration;
};
export const isCircularable = (
destPos: number,
range: number[],
circular: boolean[]
): boolean => {
return (
(circular[1] && destPos > range[1]) || (circular[0] && destPos < range[0])
);
};
export const getCirculatedPos = (
pos: number,
range: number[],
circular: boolean[]
): number => {
let toPos = pos;
const min = range[0];
const max = range[1];
const length = max - min;
if (circular[1] && pos > max) {
// right
toPos = ((toPos - max) % length) + min;
}
if (circular[0] && pos < min) {
// left
toPos = ((toPos - min) % length) + max;
}
return toPos;
};
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