function LonLatProjection(width, height) {
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var imageSize = { width: width, height: height };
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function getBoundingRect(regions) {
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var LIMIT = Number.MAX_VALUE
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var min, max
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var boundingRect = { xMin: LIMIT, yMin: LIMIT, xMax: -LIMIT, yMax: -LIMIT }
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for (var i = 0, L = regions.length; i < L; i++) {
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var rect = regions[i].getBoundingRect()
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min = { x: rect.xMin, y: rect.yMin };
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max = { x: rect.xMax, y: rect.yMax }
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boundingRect.xMin = boundingRect.xMin < min.x ? boundingRect.xMin : min.x
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boundingRect.yMin = boundingRect.yMin < min.y ? boundingRect.yMin : min.y
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boundingRect.xMax = boundingRect.xMax > max.x ? boundingRect.xMax : max.x
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boundingRect.yMax = boundingRect.yMax > max.y ? boundingRect.yMax : max.y
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}
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return boundingRect
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}
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function project(coordinate, boundingRect) {
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var width = boundingRect.xMax - boundingRect.xMin;
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var height = boundingRect.yMin - boundingRect.yMax;
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var distanceX = Math.abs(coordinate[0] - boundingRect.xMin);
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var distanceY = coordinate[1] - boundingRect.yMax;
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var percentX = (distanceX / width);
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var percentY = (distanceY / height);
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var px = percentX * imageSize.width,
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py = percentY * imageSize.height;
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return { x: px, y: py };
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}
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function unproject(pt, boundingRect) {
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var width = boundingRect.xMax - boundingRect.xMin;
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var height = boundingRect.yMin - boundingRect.yMax;
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var lon = (pt.x / imageSize.width) * width,
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lat = (pt.y / imageSize.height) * height;
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return [lon, lat];
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}
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this.project = project;
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this.unproject = unproject;
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this.getBoundingRect = getBoundingRect;
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}
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if (typeof module === "undefined") {
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this.LonLatProjection = LonLatProjection;
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} else {
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module.exports = LonLatProjection;
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}
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if (typeof define === "function") {
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define(function () { return LonLatProjection; });
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}
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