/* This notice must remain at all times. graph.js Modified: Neaveru 2007, neaveru@gmail.com - Added negative y value support Copyright (c) Balamurugan S, 2005. sbalamurugan @ hotmail.com Development support by Jexp, Inc http://www.jexp.com This package is free software. It is distributed under GPL - legalese removed, it means that you can use this for any purpose, but cannot charge for this software. Any enhancements you make to this piece of code, should be made available free to the general public! Latest non-Neaveru modified version can be downloaded from http://www.sbmkpm.com This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. line.js provides a simple mechanism to draw line graphs. It uses wz_jsgraphics.js which is copyright of its author. Usage: var g = new line_graph(); g.add("title1",value); g.add("title2",value2); g.render("canvas_name", "graph title"); //where canvas_name is a div defined INSIDE body tag

*/ hD="0123456789ABCDEF"; function d2h(d) { var h = hD.substr(d&15,1); while(d>15) {d>>=4;h=hD.substr(d&15,1)+h;} return pad(h); } function h2d(h) { return parseInt(h,16); } function pad(d) { return (d<10?'0'+d:d); } function line_graph() { this.ct = 0; this.dirty = 1; this.data = new Array(); this.x_name = new Array(); this.scale = 1; this.max = -64000; //MAX INT this.min = 0; this.range = 0; this.c_array = new Array(); this.c_array[0] = new Array(255, 192, 95); this.c_array[1] = new Array(80, 127, 175); this.c_array[2] = new Array(255, 0, 0); this.c_array[3] = new Array(255, 0, 0); this.c_array[4] = new Array(224, 119, 96); this.c_array[5] = new Array(80, 159, 144); this.c_array[6] = new Array(200, 200, 0); this.c_array[7] = new Array(0, 200, 0); this.c_array[8] = new Array(200, 0, 0); this.c_array[9] = new Array(0, 0, 200); this.c_array[10] = new Array(200, 0, 200); this.getColor = function() { if(this.ct >= (this.c_array.length-1)) this.ct = 0; else this.ct++; return "#" + d2h(this.c_array[this.ct][0]) + d2h(this.c_array[this.ct][1]) + d2h(this.c_array[this.ct][2]); } this.setScale = function(scale) { this.scale = scale; } this.setColor = function(value) { this.ct = value; } this.setMax = function(value) { this.max = value; } this.setMin = function(value) { this.min = value; } this.add = function(x_name, value) { value = parseFloat(value,10)*this.scale; this.x_name.push(x_name); this.data.push(parseFloat(value,10)); if(value > this.max) this.max = parseFloat(value,10); if(value < this.min) this.min = parseFloat(value,10); } this.drawGrid = function(jg, height, width) { jg.setColor("black"); for(var i = 0 ; i <= 5 ; i++) { jg.drawLine(0,Math.round((height/5*i)),width+20,Math.round((height/5*i))); var ff = Math.round(this.max - (this.range / 5 * i))/(this.scale); jg.drawString(ff+"",4,Math.round((height/5*i)-2)); } } this.render = function(canvas, title, height) { var jg = new jsGraphics(canvas); var h = 250; if (typeof(height) == "number") h = height; var sx = 60; var dw = (this.dw ? this.dw : 5); //spacing var shadow = 0; var fnt = 12; var rtmax = sx + 10 + (dw+Math.round((dw/2))+shadow)*(this.data.length); // Draw markers var i; jg.setColor("black"); this.range = this.max - this.min; if (!this.skipGrid) this.drawGrid(jg, height, rtmax); // Draw the bar graph var color = this.getColor(); var oldx, oldy; jg.setStroke(2); if (this.labelsOnly) { for (i = 0; i < this.data.length; i++) { jg.drawString(this.x_name[i], sx, h, "xLabel"); sx = sx+dw+Math.round(dw/2)+shadow; } } else { for(i = 0; i < this.data.length; i++) { var ht1 = Math.round((this.data[i]-this.min)*h/this.range); if(i >= 1) { jg.setColor(color); jg.drawLine(oldx, h-oldy, sx, h-ht1); } //jg.setColor("red"); //jg.fillEllipse(sx-2, h-ht1-2, 5, 5); jg.setColor("black"); jg.drawString(this.x_name[i], sx, h, "xLabel"); oldx = sx; oldy = ht1; sx = sx+dw+Math.round(dw/2)+shadow; } } /*jg.setFont("Verdana", fnt, Font.BOLD); jg.drawStringRect(title, 0, h+fnt+4, rtmax+20, "right");*/ jg.paint(); this.width = rtmax+20;//neaveru hack this.dirty = 0; } }