/** * o------------------------------------------------------------------------------o * | This file is part of the RGraph package - you can learn more at: | * | | * | http://www.rgraph.net | * | | * | This package is licensed under the RGraph license. For all kinds of business | * | purposes there is a small one-time licensing fee to pay and for non | * | commercial purposes it is free to use. You can read the full license here: | * | | * | http://www.rgraph.net/license | * o------------------------------------------------------------------------------o */ /** * Having this here means that the RGraph libraries can be included in any order, instead of you having * to include the common core library first. */ if (typeof(RGraph) == 'undefined') RGraph = {}; if (typeof(RGraph.Drawing) == 'undefined') RGraph.Drawing = {}; /** * The constructor. This function sets up the object. It takes the ID (the HTML attribute) of the canvas as the * first argument and the data as the second. If you need to change this, you can. * * @param string id The canvas tag ID * @param number x The X position of the circle * @param number y The Y position of the circle * @param number r The radius of the circle */ RGraph.Drawing.Circle = function (id, x, y, r) { this.id = id; this.canvas = document.getElementById(typeof id === 'object' ? id.id : id); this.context = this.canvas.getContext ? this.canvas.getContext("2d") : null; this.canvas.__object__ = this; /** * Store the properties */ this.centerx = x; this.centery = y; this.radius = r; /** * This defines the type of this shape */ this.type = 'drawing.circle'; /** * This facilitates easy object identification, and should always be true */ this.isRGraph = true; /** * This adds a uid to the object that you can use for identification purposes */ this.uid = RGraph.CreateUID(); /** * This adds a UID to the canvas for identification purposes */ this.canvas.uid = this.canvas.uid ? this.canvas.uid : RGraph.CreateUID(); /** * This does a few things, for example adding the .fillText() method to the canvas 2D context when * it doesn't exist. This facilitates the graphs to be still shown in older browser (though without * text obviously). You'll find the function in RGraph.common.core.js */ RGraph.OldBrowserCompat(this.context); /** * Some example background properties */ this.properties = { 'chart.strokestyle': 'rgba(0,0,0,0)', 'chart.fillstyle': 'red', 'chart.events.click': null, 'chart.events.mousemove': null, 'chart.shadow': false, 'chart.shadow.color': 'gray', 'chart.shadow.offsetx': 3, 'chart.shadow.offsety': 3, 'chart.shadow.blur': 5, 'chart.highlight.stroke': 'black', 'chart.highlight.fill': 'rgba(255,255,255,0.7)', 'chart.tooltips': null, 'chart.tooltips.highlight': true, 'chart.tooltips.event': 'onclick', 'chart.linewidth': 2 } /** * A simple check that the browser has canvas support */ if (!this.canvas) { alert('[DRAWING.CIRCLE] No canvas support'); return; } /** * This can be used to store the coordinates of shapes on the graph */ this.coords = [[x, y, r]]; /** * Create the dollar object so that functions can be added to them */ this.$0 = {}; /** * Translate half a pixel for antialiasing purposes - but only if it hasn't beeen * done already */ if (!this.canvas.__rgraph_aa_translated__) { this.context.translate(0.5,0.5); this.canvas.__rgraph_aa_translated__ = true; } ///////////////////////////////// SHORT PROPERTIES ///////////////////////////////// var RG = RGraph; var ca = this.canvas; var co = ca.getContext('2d'); var prop = this.properties; //////////////////////////////////// METHODS /////////////////////////////////////// /** * A setter method for setting graph properties. It can be used like this: obj.Set('chart.strokestyle', '#666'); * * @param name string The name of the property to set * @param value mixed The value of the property */ this.Set = function (name, value) { name = name.toLowerCase(); /** * This should be done first - prepend the propertyy name with "chart." if necessary */ if (name.substr(0,6) != 'chart.') { name = 'chart.' + name; } prop[name] = value; return this; } /** * A getter method for retrieving graph properties. It can be used like this: obj.Get('chart.strokestyle'); * * @param name string The name of the property to get */ this.Get = function (name) { /** * This should be done first - prepend the property name with "chart." if necessary */ if (name.substr(0,6) != 'chart.') { name = 'chart.' + name; } return prop[name.toLowerCase()]; } /** * Draws the circle */ this.Draw = function () { /** * Fire the onbeforedraw event */ RG.FireCustomEvent(this, 'onbeforedraw'); /** * Parse the colors. This allows for simple gradient syntax */ if (!this.colorsParsed) { this.parseColors(); // Don't want to do this again this.colorsParsed = true; } co.beginPath(); co.strokeStyle = prop['chart.strokestyle']; co.fillStyle = prop['chart.fillstyle']; co.lineWidth = prop['chart.linewidth']; if (prop['chart.shadow']) { RG.SetShadow(this, prop['chart.shadow.color'], prop['chart.shadow.offsetx'], prop['chart.shadow.offsety'], prop['chart.shadow.blur']); } co.arc(this.coords[0][0], this.coords[0][1], this.radius, 0, TWOPI, false); co.fill(); co.stroke(); // Must turn the shadow off before the fill is done RG.NoShadow(this); /** * This installs the event listeners */ RG.InstallEventListeners(this); /** * Fire the ondraw event */ RG.FireCustomEvent(this, 'ondraw'); return this; } /** * The getObjectByXY() worker method */ this.getObjectByXY = function (e) { if (this.getShape(e)) { return this; } } /** * Not used by the class during creating the shape, but is used by event handlers * to get the coordinates (if any) of the selected bar * * @param object e The event object * @param object OPTIONAL You can pass in the bar object instead of the * function using "this" */ this.getShape = function (e) { var mouseXY = RGraph.getMouseXY(e); var mouseX = mouseXY[0]; var mouseY = mouseXY[1]; if (RG.getHypLength(this.centerx, this.centery, mouseXY[0], mouseXY[1]) <= this.radius) { return { 0: this, 1: this.centerx, 2: this.centery, 3: this.radius, 4: null, 5: 0, 'object': this, 'x': this.centerx, 'y': this.centery, 'radius': this.radius, 'index': 0, 'tooltip': prop['chart.tooltips'] ? prop['chart.tooltips'][0] : null }; } return null; } /** * This function positions a tooltip when it is displayed * * @param obj object The chart object * @param int x The X coordinate specified for the tooltip * @param int y The Y coordinate specified for the tooltip * @param objec tooltip The tooltips DIV element */ this.positionTooltip = function (obj, x, y, tooltip, idx) { var canvasXY = RG.getCanvasXY(obj.canvas); var width = tooltip.offsetWidth; var height = tooltip.offsetHeight; var radius = this.radius; // Set the top position tooltip.style.left = 0; tooltip.style.top = canvasXY[1] + obj.centery - height - 7 + 'px'; // By default any overflow is hidden tooltip.style.overflow = ''; // The arrow var img = new Image(); img.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAAFCAYAAACjKgd3AAAARUlEQVQYV2NkQAN79+797+RkhC4M5+/bd47B2dmZEVkBCgcmgcsgbAaA9GA1BCSBbhAuA/AagmwQPgMIGgIzCD0M0AMMAEFVIAa6UQgcAAAAAElFTkSuQmCC'; img.style.position = 'absolute'; img.id = '__rgraph_tooltip_pointer__'; img.style.top = (tooltip.offsetHeight - 2) + 'px'; tooltip.appendChild(img); // Reposition the tooltip if at the edges: // LEFT edge if ((canvasXY[0] + obj.centerx - (width / 2)) < 10) { tooltip.style.left = (canvasXY[0] + this.centerx - (width * 0.1)) + 'px'; img.style.left = ((width * 0.1) - 8.5) + 'px'; // RIGHT edge } else if ((canvasXY[0] + obj.centerx + (width / 2)) > document.body.offsetWidth) { tooltip.style.left = canvasXY[0] + this.centerx - (width * 0.9) + 'px'; img.style.left = ((width * 0.9) - 8.5) + 'px'; // Default positioning - CENTERED } else { tooltip.style.left = (canvasXY[0] + this.centerx - (width * 0.5)) + 'px'; img.style.left = ((width * 0.5) - 8.5) + 'px'; } } /** * Each object type has its own Highlight() function which highlights the appropriate shape * * @param object shape The shape to highlight */ this.Highlight = function (shape) { if (prop['chart.tooltips.highlight']) { co.beginPath(); co.strokeStyle = prop['chart.highlight.stroke']; co.fillStyle = prop['chart.highlight.fill']; co.arc(this.centerx, this.centery, this.radius + 0.5, 0, TWOPI, false); co.fill(); co.stroke(); } } /** * This allows for easy specification of gradients */ this.parseColors = function () { /** * Parse various properties for colors */ prop['chart.fillstyle'] = this.parseSingleColorForGradient(prop['chart.fillstyle']); prop['chart.strokestyle'] = this.parseSingleColorForGradient(prop['chart.strokestyle']); prop['chart.highlight.stroke'] = this.parseSingleColorForGradient(prop['chart.highlight.stroke']); prop['chart.highlight.fill'] = this.parseSingleColorForGradient(prop['chart.highlight.fill']); } /** * This parses a single color value */ this.parseSingleColorForGradient = function (color) { if (!color) { return color; } if (color.match(/^gradient\((.*)\)$/i)) { var parts = RegExp.$1.split(':'); // Create the gradient var grad = co.createLinearGradient(0,0,ca.width,0); var diff = 1 / (parts.length - 1); grad.addColorStop(0, RGraph.trim(parts[0])); for (var j=1; j