54 lines
1.3 KiB
JavaScript
54 lines
1.3 KiB
JavaScript
/**
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* Compute the euclidean distance between two points
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* @param {Point} p1
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* @param {Point} p2
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*/
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export function computeDist(p1, p2) {
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return Math.sqrt(Math.pow(p1.x - p2.x, 2) + Math.pow(p1.y - p2.y, 2));
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}
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/**
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* Return the current time in ms since 1970
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* @returns {number}
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*/
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export function getCurrentTimeMs() {
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return new Date().getTime();
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}
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/**
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* get 'GET' parameter by variable name
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* @param variable
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* @return {boolean|*}
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*/
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export function getQueryVariable(variable) {
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const query = window.location.search.substring(1);
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const vars = query.split("&");
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for (let i = 0; i < vars.length; i++) {
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const pair = vars[i].split("=");
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if (pair[0] === variable) {
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return pair[1];
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}
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}
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return false;
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}
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export function getSubDir() {
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const url = document.URL.substr(0, document.URL.lastIndexOf("/"));
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const urlSplit = url.split("/");
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let subdir = "";
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for (let i = 3; i < urlSplit.length; i++) {
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subdir = subdir + "/" + urlSplit[i];
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}
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return subdir;
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}
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export function fillTextMultiLine(ctx, text, x, y) {
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var lineHeight = ctx.measureText("M").width * 2.5;
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var lines = text.split("\n");
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for (var i = 0; i < lines.length; ++i) {
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ctx.fillText(lines[i], x, y);
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y += lineHeight;
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}
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}
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