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171 lines
5.9 KiB
171 lines
5.9 KiB
// DOM utility methods
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/**
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* this prepares the JSON container for allocating SVG elements
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* @param JSONcontainer
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* @private
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*/
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exports.prepareElements = function(JSONcontainer) {
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// cleanup the redundant svgElements;
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for (var elementType in JSONcontainer) {
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if (JSONcontainer.hasOwnProperty(elementType)) {
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JSONcontainer[elementType].redundant = JSONcontainer[elementType].used;
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JSONcontainer[elementType].used = [];
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}
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}
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};
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/**
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* this cleans up all the unused SVG elements. By asking for the parentNode, we only need to supply the JSON container from
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* which to remove the redundant elements.
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*
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* @param JSONcontainer
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* @private
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*/
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exports.cleanupElements = function(JSONcontainer) {
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// cleanup the redundant svgElements;
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for (var elementType in JSONcontainer) {
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if (JSONcontainer.hasOwnProperty(elementType)) {
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if (JSONcontainer[elementType].redundant) {
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for (var i = 0; i < JSONcontainer[elementType].redundant.length; i++) {
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JSONcontainer[elementType].redundant[i].parentNode.removeChild(JSONcontainer[elementType].redundant[i]);
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}
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JSONcontainer[elementType].redundant = [];
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}
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}
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}
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};
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/**
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* Allocate or generate an SVG element if needed. Store a reference to it in the JSON container and draw it in the svgContainer
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* the JSON container and the SVG container have to be supplied so other svg containers (like the legend) can use this.
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*
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* @param elementType
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* @param JSONcontainer
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* @param svgContainer
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* @returns {*}
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* @private
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*/
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exports.getSVGElement = function (elementType, JSONcontainer, svgContainer) {
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var element;
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// allocate SVG element, if it doesnt yet exist, create one.
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if (JSONcontainer.hasOwnProperty(elementType)) { // this element has been created before
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// check if there is an redundant element
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if (JSONcontainer[elementType].redundant.length > 0) {
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element = JSONcontainer[elementType].redundant[0];
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JSONcontainer[elementType].redundant.shift();
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}
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else {
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// create a new element and add it to the SVG
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element = document.createElementNS('http://www.w3.org/2000/svg', elementType);
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svgContainer.appendChild(element);
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}
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}
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else {
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// create a new element and add it to the SVG, also create a new object in the svgElements to keep track of it.
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element = document.createElementNS('http://www.w3.org/2000/svg', elementType);
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JSONcontainer[elementType] = {used: [], redundant: []};
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svgContainer.appendChild(element);
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}
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JSONcontainer[elementType].used.push(element);
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return element;
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};
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/**
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* Allocate or generate an SVG element if needed. Store a reference to it in the JSON container and draw it in the svgContainer
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* the JSON container and the SVG container have to be supplied so other svg containers (like the legend) can use this.
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*
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* @param elementType
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* @param JSONcontainer
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* @param DOMContainer
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* @returns {*}
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* @private
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*/
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exports.getDOMElement = function (elementType, JSONcontainer, DOMContainer, insertBefore) {
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var element;
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// allocate DOM element, if it doesnt yet exist, create one.
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if (JSONcontainer.hasOwnProperty(elementType)) { // this element has been created before
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// check if there is an redundant element
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if (JSONcontainer[elementType].redundant.length > 0) {
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element = JSONcontainer[elementType].redundant[0];
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JSONcontainer[elementType].redundant.shift();
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}
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else {
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// create a new element and add it to the SVG
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element = document.createElement(elementType);
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if (insertBefore !== undefined) {
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DOMContainer.insertBefore(element, insertBefore);
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}
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else {
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DOMContainer.appendChild(element);
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}
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}
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}
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else {
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// create a new element and add it to the SVG, also create a new object in the svgElements to keep track of it.
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element = document.createElement(elementType);
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JSONcontainer[elementType] = {used: [], redundant: []};
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if (insertBefore !== undefined) {
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DOMContainer.insertBefore(element, insertBefore);
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}
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else {
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DOMContainer.appendChild(element);
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}
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}
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JSONcontainer[elementType].used.push(element);
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return element;
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};
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/**
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* draw a point object. this is a seperate function because it can also be called by the legend.
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* The reason the JSONcontainer and the target SVG svgContainer have to be supplied is so the legend can use these functions
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* as well.
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*
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* @param x
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* @param y
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* @param group
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* @param JSONcontainer
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* @param svgContainer
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* @returns {*}
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*/
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exports.drawPoint = function(x, y, group, JSONcontainer, svgContainer) {
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var point;
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if (group.options.drawPoints.style == 'circle') {
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point = exports.getSVGElement('circle',JSONcontainer,svgContainer);
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point.setAttributeNS(null, "cx", x);
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point.setAttributeNS(null, "cy", y);
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point.setAttributeNS(null, "r", 0.5 * group.options.drawPoints.size);
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point.setAttributeNS(null, "class", group.className + " point");
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}
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else {
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point = exports.getSVGElement('rect',JSONcontainer,svgContainer);
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point.setAttributeNS(null, "x", x - 0.5*group.options.drawPoints.size);
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point.setAttributeNS(null, "y", y - 0.5*group.options.drawPoints.size);
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point.setAttributeNS(null, "width", group.options.drawPoints.size);
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point.setAttributeNS(null, "height", group.options.drawPoints.size);
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point.setAttributeNS(null, "class", group.className + " point");
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}
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return point;
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};
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/**
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* draw a bar SVG element centered on the X coordinate
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*
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* @param x
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* @param y
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* @param className
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*/
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exports.drawBar = function (x, y, width, height, className, JSONcontainer, svgContainer) {
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// if (height != 0) {
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var rect = exports.getSVGElement('rect',JSONcontainer, svgContainer);
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rect.setAttributeNS(null, "x", x - 0.5 * width);
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rect.setAttributeNS(null, "y", y);
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rect.setAttributeNS(null, "width", width);
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rect.setAttributeNS(null, "height", height);
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rect.setAttributeNS(null, "class", className);
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// }
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};
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