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Contents
//This file is automatically rebuilt by the Cesium build process.
/*global define*/
define(function() {
"use strict";
return "/**\n\
* Computes the fraction of a Web Wercator extent at which a given geodetic latitude is located.\n\
*\n\
* @name czm_latitudeToWebMercatorFraction\n\
* @glslFunction\n\
*\n\
* @param {float} The geodetic latitude, in radians.\n\
* @param {float} The low portion of the Web Mercator coordinate of the southern boundary of the extent.\n\
* @param {float} The high portion of the Web Mercator coordinate of the southern boundary of the extent.\n\
* @param {float} The total height of the extent in Web Mercator coordinates.\n\
*\n\
* @returns {float} The fraction of the extent at which the latitude occurs. If the latitude is the southern\n\
* boundary of the extent, the return value will be zero. If it is the northern boundary, the return\n\
* value will be 1.0. Latitudes in between are mapped according to the Web Mercator projection.\n\
*/ \n\
float czm_latitudeToWebMercatorFraction(float latitude, float southMercatorYLow, float southMercatorYHigh, float oneOverMercatorHeight)\n\
{\n\
float sinLatitude = sin(latitude);\n\
float mercatorY = 0.5 * log((1.0 + sinLatitude) / (1.0 - sinLatitude));\n\
\n\
// mercatorY - southMercatorY in simulated double precision.\n\
float t1 = 0.0 - southMercatorYLow;\n\
float e = t1 - 0.0;\n\
float t2 = ((-southMercatorYLow - e) + (0.0 - (t1 - e))) + mercatorY - southMercatorYHigh;\n\
float highDifference = t1 + t2;\n\
float lowDifference = t2 - (highDifference - t1);\n\
\n\
return highDifference * oneOverMercatorHeight + lowDifference * oneOverMercatorHeight;\n\
}\n\
";
});
Version data entries
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