69 lines
1.3 KiB
JavaScript
69 lines
1.3 KiB
JavaScript
goog.provide('ol.render.webgl');
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/**
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* @const
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* @type {ol.Color}
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*/
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ol.render.webgl.defaultFillStyle = [0.0, 0.0, 0.0, 1.0];
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/**
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* @const
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* @type {string}
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*/
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ol.render.webgl.defaultLineCap = 'round';
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/**
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* @const
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* @type {Array.<number>}
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*/
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ol.render.webgl.defaultLineDash = [];
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/**
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* @const
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* @type {string}
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*/
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ol.render.webgl.defaultLineJoin = 'round';
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/**
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* @const
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* @type {number}
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*/
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ol.render.webgl.defaultMiterLimit = 10;
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/**
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* @const
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* @type {ol.Color}
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*/
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ol.render.webgl.defaultStrokeStyle = [0.0, 0.0, 0.0, 1.0];
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/**
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* @const
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* @type {number}
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*/
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ol.render.webgl.defaultLineWidth = 1;
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/**
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* Calculates the orientation of a triangle based on the determinant method.
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* @param {number} x1 First X coordinate.
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* @param {number} y1 First Y coordinate.
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* @param {number} x2 Second X coordinate.
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* @param {number} y2 Second Y coordinate.
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* @param {number} x3 Third X coordinate.
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* @param {number} y3 Third Y coordinate.
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* @return {boolean|undefined} Triangle is clockwise.
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*/
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ol.render.webgl.triangleIsCounterClockwise = function(x1, y1, x2, y2, x3, y3) {
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var area = (x2 - x1) * (y3 - y1) - (x3 - x1) * (y2 - y1);
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return (area <= ol.render.webgl.EPSILON && area >= -ol.render.webgl.EPSILON) ?
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undefined : area > 0;
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};
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/**
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* @const
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* @type {number}
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*/
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ol.render.webgl.EPSILON = Number.EPSILON || 2.220446049250313e-16;
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