69 lines
2.4 KiB
JavaScript
69 lines
2.4 KiB
JavaScript
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// compatibility mode for old browser
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function getElementsByClassName(node, classname) {
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var a = [];
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var re = new RegExp('(^| )'+classname+'( |$)');
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var els = node.getElementsByTagName("*");
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for(var i=0,j=els.length; i<j; i++)
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if(re.test(els[i].className))a.push(els[i]);
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return a;
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}
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document.head = document.head || document.getElementsByTagName('head')[0];
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// ------------------------------------------------------
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// human readable time
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function secondsToTime(seconds){
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seconds = parseInt(seconds);
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minutes = parseInt(seconds/60);
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seconds = seconds%60;
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hours = parseInt(minutes/60);
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minutes = minutes%60;
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if(hours==0){
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return minutes+' min';
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}
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else{
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return hours+' h '+minutes+' min';
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}
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}
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// human readable distance
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function getDistanceWithUnit(distance){
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distance = parseInt(distance);
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if(distance >= 1000){ return (parseInt(distance/1000))+' km'; }
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else{ return distance+' m'; }
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}
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// ------------------------------------------------------
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// distance between two points
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function distanceBetweenPoint(x1, y1, x2, y2) {
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var a = x1 - x2;
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var b = y1 - y2;
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return Math.sqrt(a*a + b*b);
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}
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// distance from a point to a line or segment
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// (x,y) point
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// (x0,y0) line point A
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// (x1,y1) line point B
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// o specifies if the distance should respect the limits of the segment (overLine = true)
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// or if it should consider the segment as an infinite line (overLine = false);
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// if false returns the distance from the point to the line,
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// otherwise the distance from the point to the segment
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function dotLineLength(x, y, x0, y0, x1, y1, o){
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function lineLength(x, y, x0, y0){return Math.sqrt((x -= x0) * x + (y -= y0) * y);}
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if(o && !(o = function(x, y, x0, y0, x1, y1){
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if(!(x1 - x0)) return {x: x0, y: y};
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else if(!(y1 - y0)) return {x: x, y: y0};
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var left, tg = -1 / ((y1 - y0) / (x1 - x0));
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return {x: left = (x1 * (x * tg - y + y0) + x0 * (x * - tg + y - y1)) / (tg * (x1 - x0) + y0 - y1), y: tg * left - tg * x + y};
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}(x, y, x0, y0, x1, y1) && o.x >= Math.min(x0, x1) && o.x <= Math.max(x0, x1) && o.y >= Math.min(y0, y1) && o.y <= Math.max(y0, y1))){
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var l1 = lineLength(x, y, x0, y0), l2 = lineLength(x, y, x1, y1);
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return l1 > l2 ? l2 : l1;
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}
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else {
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var a = y0 - y1, b = x1 - x0, c = x0 * y1 - y0 * x1;
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return Math.abs(a * x + b * y + c) / Math.sqrt(a * a + b * b);
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}
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};
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