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dvisual.js
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CanvasRenderingContext2D.prototype.sector = function (x, y, radius, sDeg, eDeg) {
this.save();
this.translate(x, y);
this.beginPath();
this.arc(0,0,radius,sDeg, eDeg);
this.save();
this.rotate(eDeg);
this.moveTo(radius,0);
if ((eDeg - sDeg)%(Math.PI*2)!=0)
this.lineTo(0,0);
//this.lineTo(0,0);
this.restore();
this.rotate(sDeg);
this.lineTo(radius,0);
this.closePath();
this.restore();
return this;
}
CanvasRenderingContext2D.prototype.clear_canvas = function () {
this.clearRect(0,0,10000,10000);
return this;
}
CanvasRenderingContext2D.prototype.clear_arc = function() {
this.save();
this.globalCompositeOperation = 'destination-out';
this.fillStyle = 'black';
this.fill();
this.restore();
};
CanvasRenderingContext2D.prototype.clearArc = function(x, y, radius, startAngle, endAngle, anticlockwise) {
this.beginPath();
this.arc(x, y, radius, startAngle, endAngle, anticlockwise);
this.clear_arc();
};
DVChartList = [DVBarChart,DVPieChart,DVLineChart,DVHistChart,DVRadarChart,DVMulLineChart,DVMulBarChart];
DVCanvasList = [];
function DVClone(obj){
if(!obj||"object" != typeof obj){
return null;
}
var result = (obj instanceof Array)?[]:{};
for(var i in obj){
result[i] = ("object" != typeof obj[i])?obj[i]:DVClone(obj[i]);
}
return result;
}
Array.prototype.max = function()
{
return Math.max.apply({},this)
}
Array.prototype.min = function()
{
return Math.min.apply({},this)
}
/**
* The Main Class of DVisual
* @constructor
* @param {string} canvasName - the canvas's id you want to paint
* @example new DVisual(canvas_id);
*/
function DVisual(canvasName)
{
reshape_flag = true;
for (var i=0;i<DVCanvasList.length;i++)
if (DVCanvasList[i]==canvasName)
{
reshape_flag = false;
}
if (reshape_flag)
DVCanvasList.push(canvasName);
this.canvas = document.getElementById(canvasName);
this.ctx = this.canvas.getContext('2d');
this.ctx.clear_canvas();
this.eles = new Array();
this.devicePixelRatio = window.devicePixelRatio || 1;
this.backingStorePixelRatio = this.ctx.webkitBackingStorePixelRatio ||
this.ctx.mozBackingStorePixelRatio ||
this.ctx.msBackingStorePixelRatio ||
this.ctx.oBackingStorePixelRatio ||
this.ctx.backingStorePixelRatio || 1;
this.ratio = this.devicePixelRatio / this.backingStorePixelRatio;
if (reshape_flag)
{
this.oldWidth = this.canvas.width;
this.oldHeight = this.canvas.height;
if (this.devicePixelRatio !== this.backingStorePixelRatio)
{
this.canvas.width = this.oldWidth * this.ratio;
this.canvas.height = this.oldHeight * this.ratio;
this.canvas.style.width = this.oldWidth + 'px';
this.canvas.style.height = this.oldHeight + 'px';
this.ctx.scale(this.ratio, this.ratio);
}
} else
{
this.oldWidth = this.canvas.width/this.ratio;
this.oldHeight = this.canvas.height/this.ratio;
}
this.Xinc = 0;
this.Yinc = 0;
this.Xmargin = this.oldWidth - 40;
this.Ymargin = this.oldHeight - 55;
this.XZoom = 1;
this.YZoom = 1;
this.originX = 25;
this.originY = this.oldHeight - 40;
this.drawed = false;
this.mouseMove = false;
this.clickDot = {'X':new Array(),'Y':new Array()};
// canvasName = this;
// this.canvas.addEventListener('mousemove', function(e){
// p = getEventPosition(e);
// canvasName.ctx.clear();
// canvasName.draw()
// canvasName.ctx.moveTo(0,p.y);
// canvasName.ctx.lineTo(canvasName.oldWidth,p.y);
// canvasName.ctx.moveTo(p.x,0);
// canvasName.ctx.lineTo(p.x,canvasName.oldHeight);
// canvasName.ctx.strokeText(canvasName.transXY(p.x,p.y)[0].toFixed(2)+" "+canvasName.transXY(p.x,p.y)[1].toFixed(2),p.x,p.y)
// canvasName.ctx.stroke();
// }, false);
}
/**
* set the mouseMove to true,you can get the coordinate when you move the mouse on the canvas
* @function
*/
DVisual.prototype.setMouseMove = function()
{
this.mouseMove = true;
var canvasName = this;
this.canvas.addEventListener('mousemove', function(e){
p = getEventPosition(e);
canvasName.ctx.clear_canvas();
canvasName.draw()
canvasName.ctx.moveTo(0,p.y);
canvasName.ctx.lineTo(canvasName.oldWidth,p.y);
canvasName.ctx.moveTo(p.x,0);
canvasName.ctx.lineTo(p.x,canvasName.oldHeight);
canvasName.ctx.strokeText(canvasName.transXY(p.x,p.y)[0].toFixed(2)+" "+canvasName.transXY(p.x,p.y)[1].toFixed(2),p.x,p.y)
canvasName.ctx.stroke();
}, false);
}
/**
* set the clickDot to true,you can click the canvas to add a dot on the canvas
* @function
* @param {DVColor} - the color of the dot you want
*/
DVisual.prototype.setClickDot = function(color)
{
var canvasName = this;
if (arguments.length==0)
color = DVgetRandomColor(1)[0];
this.canvas.addEventListener('mouseup', function(e){
p = getEventPosition(e);
canvasName.ctx.clear_canvas();
canvasName.addElement(new DVDot({'x':p.x,'y':p.y,'color':color}));
canvasName.draw();
real = canvasName.transXY(p.x,p.y);
canvasName.clickDot.X.push(real[0]);
canvasName.clickDot.Y.push(real[1]);
}, false);
}
/**
* return
* @function
* @return {Objects} clickDot - return the clicked dot data
*/
DVisual.prototype.getClickDot = function()
{
return this.clickDot;
}
/**
* The Formated Color Class of DVisual
* @constructor
* @param {double} r - the Red component of RGBs,0 in default,[0-256]
* @param {double} g - the Green component of RGBs,0 in default,[0-256]
* @param {double} b - the Blue component of RGBs,0 in default,[0-256]
* @param {double} a - the Alpha component of RGBa,1 in default,[0-1]
*/
function DVColor(r,g,b,a)
{
if (arguments.length<4)
a = 1;
if (arguments.length<3)
b = 0;
if (arguments.length<2)
g = 0;
if (arguments.length<1)
r = 0;
this.a = a;
this.r = r;
this.g = g;
this.b = b;
}
/**
* translate the color to the html color style
* @function
* @return {string} the rgba style string
*/
DVColor.prototype.tostring = function()
{
return "rgba("+this.r+","+this.g+","+this.b+","+this.a+")";
}
/**
* get the eventPosition on canvas
* @function
* @return {{}} {x:x,y:y}
*/
function getEventPosition(ev){
var x, y;
if (ev.layerX || ev.layerX == 0) {
x = ev.layerX;
y = ev.layerY;
}else if (ev.offsetX || ev.offsetX == 0) { // Opera
x = ev.offsetX;
y = ev.offsetY;
}
return {x: x, y: y};
}
/**
* translate the x and y coordinate from data space to real canvas space
* @function
* @param {double} x - x value in data space
* @param {double} y - y value in data space
* @return {Array(double)} [resultX,resultY] - the real coordinate value of (x,y)
*/
DVisual.prototype.xyTrans = function(x,y)
{
resultX = (x*1.0 - this.Xinc)/this.XZoom + this.originX;
resultY = this.originY - (y*1.0 - this.Yinc)/this.YZoom;
return [resultX,resultY]
}
/**
* translate the x and y coordinate from real canvas space to data space
* @function
* @param {double} x - x value in real canvas space
* @param {double} y - y value in real canvas space
* @return {Array(double)} [resultX,resultY] - the real coordinate value of (x,y)
*/
DVisual.prototype.transXY = function(x,y)
{
resultX = (x - this.originX)*this.XZoom+this.Xinc;
resultY = (this.originY - y)*this.YZoom+this.Yinc;
return [resultX,resultY]
}
/**
* translate the x length from data space to real canvas space
* @function
* @param {double} len - the length in data space
* @return {double} length - the length in real canvas space
*/
DVisual.prototype.xLenTrans = function(len) {
return len*1.0/this.XZoom;
}
/**
* translate the y length from data space to real canvas space
* @function
* @param {double} len - the length in data space
* @return {double} length - the length in real canvas space
*/
DVisual.prototype.yLenTrans = function(len) {
return len*1.0/this.YZoom;
}
/**
* initialize the Z data degree for zoom
* @function
* @param {Array(double)} Z - the Z degree data,should contain the maxium and minum.
*/
DVisual.prototype.initialZ = function(Z) {
zmm = [Z.min(),Z.max()];
this.zinc = 0;
if ((zmm[1]-zmm[0])*1.0/zmm[0]<0.2)
this.zinc = zmm[0];
this.Zzoom = (Math.min(this.oldWidth,this.oldHeight)/10 - 5)/(zmm[1] - this.zinc);
}
/**
* translate the z length from data space to real canvas space
* @function
* @param {double} len - the length in data space
* @return {double} length - the length in real canvas space
*/
DVisual.prototype.zLenTrans = function(len)
{
return (len - this.zinc)*this.Zzoom+5;
}
/**
* set the base value of X and Y
* @function
* @param {double} Xinc - the base increment value of X
* @param {double} Yinc - the base increment value of Y
*/
DVisual.prototype.setinc = function(Xinc,Yinc)
{
this.Xinc = Xinc;
this.Yinc = Yinc;
};
/**
* set the margin of data space,set the zoom value of x and y;
* @function
* @param {double} Xmargin - the margin of X in data space
* @param {double} Ymargin - the margin of Y in data space
*/
DVisual.prototype.setmargin = function(Xmargin,Ymargin)
{
this.XZoom = Xmargin*1.2/this.Xmargin;
this.YZoom = Ymargin*1.2/this.Ymargin;
this.Xmargin = Xmargin*1.2;
this.Ymargin = Ymargin*1.2;
};
/**
* intialize the zoom and margin of X and Y
* @function
* @param {Array(double)} X - the data'X
* @param {Array(double)} Y - the data'Y
*/
DVisual.prototype.initial = function(X,Y)
{
incX = Math.min(0.0,Math.floor(X.min()));
incY = Math.min(0.0,Math.floor(Y.min()));
xmargin = this.oldWidth;
ymargin = this.oldHeight;
if (this.Drawed)
{
return 0;
}
if (X.length!=0)
{
xm = (X.max()-X.min())*1.0;
if ((xm/X.max())<0.3)
incX = Math.floor(X.min())-1;
xmargin = X.max()-incX;
}
if (Y.length!=0)
{
ym = (Y.max()-Y.min())*1.0;
if ((ym/Y.max())<0.3)
incY = Math.floor(Y.min())-1;
ymargin = Y.max()-incY;
}
this.setinc(incX,incY);
this.setmargin(xmargin,ymargin);
this.Drawed = true;
};
/**
* add the element to the main class
* @function
* @param {DVElement} ele - DVElement can be any DVisual Graph Class,contain a draw() fucntion to draw itself on canvas.
*/
DVisual.prototype.addElement = function(ele)
{
this.eles.push(ele);
}
/**
* draw all graph on the canvas
* @function
*/
DVisual.prototype.draw = function()
{
for (var i=this.eles.length-1;i>=0;i--)
this.eles[i].draw(this);
}
/**
* A DVisual graph element indicate a dot.(bubble)
* @constructor
* @example new DVDot({'x':100,'y':100});
* @param {Object[]} args - a array contain arguments below
* @param {double} args.x - the x value of the dot
* @param {double} args.y - the y value of the dot,0 in default
* @param {DVColor=} [args.color = new DVColor()] - the color of the dot,black in default
* @param {string=} [args.style ='fill']- the style of this dot,should be one of 'fill','stroke' and 'bubble'
* @param {string=} [args.bubbleText ='']- the text show in the bubble
* @param {boolean=} [args.shadow ='true'] - whether draw dot's shadow.
* @param {double=} [args.radius = '2'] - the radius of this dot(a circle)
* @param {double=} [args.lineWidth = '1'] - the lineWidth of this dot(a circle)
*/
function DVDot(args)
{
if (arguments.length==0)
args = {};
this.args = DVClone(args);
if (args['x']==null)
this.args['x'] = 0;
if (args['y']==null)
this.args['y'] = 0;
if (args['color']==null)
this.args['color'] = new DVColor();
if (args['style']==null || (args.style!="fill" && args.style!="stroke" && args.style!="bubble" ))
this.args['style'] = "fill";
if (args['bubbleText']==null)
this.args['bubbleText'] = "";
if (args['shadow']==null)
this.args['shadow'] = true;
if (args['radius']==null)
this.args['radius'] = 2;
if (args['lineWidth']==null)
this.args['lineWidth'] = 1;
}
/**
* draw the dot on dv's canvas
* @function
* @param {DVisual} dv - the Dvisual instance you want to draw the dot
*/
DVDot.prototype.draw = function(dv)
{
dv.ctx.save();
dv.ctx.fillStyle = this.args.color.tostring();
dv.ctx.strokeStyle = this.args.color.tostring();
dv.ctx.lineWidth = this.args['lineWidth'];
shadow = new DVColor(100,100,100,0.3);
if (this.args['shadow'])
{
if (this.shadowDot == null)
{
shadowArgs = DVClone(this.args);
shadowArgs['color'] = new DVColor(100,100,100,0.3);
shadowArgs['shadow'] = false;
shadowArgs['x']+=1;
shadowArgs['y']+=1;
shadowArgs['description'] = "";
this.shadowDot = new DVDot(shadowArgs);
}
this.shadowDot.draw(dv);
}
if (this.args['style']=='stroke')
{
dv.ctx.sector(this.args.x,this.args.y,this.args.radius,0,2*Math.PI);
dv.ctx.stroke();
}
if (this.args['style']=='fill')
{
dv.ctx.sector(this.args.x,this.args.y,this.args.radius,0,2*Math.PI);
dv.ctx.fill();
}
if (this.args['style']=='bubble')
{
dv.ctx.sector(this.args.x,this.args.y,this.args.radius,0,2*Math.PI);
dv.ctx.stroke();
a = this.args.color.a;
if (this.args.color.a>0.7)
a = 0.4;
dv.ctx.fillStyle = (new DVColor(this.args.color.r,this.args.color.g,this.args.color.b,a)).tostring();
dv.ctx.sector(this.args.x,this.args.y,this.args.radius,0,2*Math.PI);
dv.ctx.fill();
if (this.args.bubbleText.length>0)
{
testStr = this.args.bubbleText;
if (dv.ctx.measureText("D").width>dv.ctx.measureText("testStr").width)
teststr = 'D';
rightfont = DVgetRightTextStyleByStrLenght(dv,teststr,this.args.radius*1.5);
dv.ctx.font = rightfont;
dv.ctx.textAlign = 'center';
dv.ctx.fillStyle = '#FFF';
dv.ctx.fillText(this.args.bubbleText,this.args.x,this.args.y+dv.ctx.measureText("D").width*1.0/2);
dv.ctx.closePath();
}
}
dv.ctx.restore();
}
/**
* A DVisual graph element indicate a text
* @constructor
* @example new DVDot({'x':100,'y':100,'font'="13px Arial"});
* @param {Object[]} args - a array contain arguments below
* @param {double} args.x - the x value of the dot
* @param {double} args.y - the y value of the dot,0 in default
* @param {string} args.text - the text content you want to draw
* @param {string=} [args.font="8px Arial"] - the text's font
* @param {DVColor=} [args.color = new DVColor()] - the color of the dot,black in default
* @param {string=} [args.style ='fill']- the style of this dot,should be one of 'fill','stroke'
* @param {boolean=} [args.shadow =true] - whether draw text's shadow.
* @param {double=} [args.maxwidth =-1] - the limited width of printed text,-1 means no limit
* @param {string=} [args.textAlign = 'left'] - the text align of printed text position
* @param {string=} [args.direction = 'horizontal'] - the direction of text:horizontal or vertical
* @param {double=} [args.lineWidth = '1'] - the lineWidth of text
* @param {double=} [args.rotate = 0] - the lineWidth of text
*/
function DVText(args)
{
if (arguments.length==0)
args = {};
this.args = DVClone(args);
if (args['x']==null)
this.args['x'] = 0;
if (args['y']==null)
this.args['y'] = 0;
if (args['text']==null)
this.args['text'] = "";
if (args['font']==null)
this.args['font'] = "8px Arial";
if (args['color']==null)
this.args['color'] = new DVColor();
if (args['style']==null || (args.style!="stroke" && args.style!="fill"))
this.args['style'] = "fill";
if (args['shadow']==null)
this.args['shadow'] = true;
if (args['maxwidth']==null)
this.args['maxwidth'] = -1;
if (args['lineWidth']==null)
this.args['lineWidth'] = 1;
if (args['rotate']==null)
this.args['rotate'] = 0;
if (args['textAlign']==null)
this.args['textAlign'] = 'left';
if (args['direction']==null || (args['direction']!='vertical' && args['direction']!='horizontal'))
this.args['direction'] = 'horizontal';
}
/**
* draw the text on dv's canvas
* @function
* @param {DVisual} dv - the Dvisual instance you want to draw
*/
DVText.prototype.draw = function(dv)
{
dv.ctx.save();
dv.ctx.fillStyle = this.args.color.tostring();
dv.ctx.strokeStyle = this.args.color.tostring();
dv.ctx.font = this.args['font'];
dv.ctx.lineWidth = this.args['lineWidth'];
dv.ctx.textAlign = this.args['textAlign'];
dv.ctx.beginPath();
shadow = new DVColor(100,100,100,0.3);
if (this.args['shadow'])
{
if (this.shadowText == null)
{
shadowArgs = DVClone(this.args);
shadowArgs['color'] = new DVColor(100,100,100,0.3);
shadowArgs['shadow'] = false;
shadowArgs['x']+=1;
shadowArgs['y']+=1;
this.shadowText = new DVText(shadowArgs);
}
this.shadowText.draw(dv);
}
x = this.args.x;
y = this.args.y;
if (this.args.direction=='vertical')
{
dv.ctx.rotate(-Math.PI/2)
tmp = x;
x = -y;
y = tmp;
}
if (this.args.rotate!=0)
{
dv.ctx.translate(x,y);
x = 0;
y = 0;
dv.ctx.rotate(this.args.rotate);
}
if (this.args['style']=='stroke')
{
if (this.args['maxwidth']==-1)
dv.ctx.strokeText(this.args.text,x,y);
else
dv.ctx.strokeText(this.args.text,x,y,this.args['maxwidth']);
}
if (this.args['style']=='fill')
{
if (this.args['maxwidth']==-1)
dv.ctx.fillText(this.args.text,x,y);
else
dv.ctx.fillText(this.args.text,x,y,this.args['maxwidth']);
}
if (this.args.direction=='vertical')
{
dv.ctx.rotate(Math.PI/2);
}
if (this.args.rotate!=0)
{
dv.ctx.rotate(-this.args.rotate);
dv.ctx.translate(-this.args.x,-this.args.y);
}
dv.ctx.fill();
dv.ctx.closePath();
dv.ctx.restore();
}
/**
* A DVisual graph element indicate a line
* @constructor
* @example new DVLine({'beginX':100,'beginY':100,'endX':20,'endY':20,'style':'dash'});
* @param {Object[]} args - a array contain arguments below
* @param {double} args.beginX - the x value of the start node
* @param {double} args.beginY - the y value of the start node
* @param {double} args.endX - the x value of the stop node
* @param {double} args.endY - the y value of the stop node
* @param {DVColor=} [args.color = new DVColor()] - the color of the dot,black in default
* @param {string=} [args.style ='real']- the style of this dot,should be one of 'real','dash'
* @param {boolean=} [args.shadow =true] - whether draw the line's shadow.
* @param {double=} [args.lineWidth = '1'] - the lineWidth of line
*/
function DVLine(args)
{
if (arguments.length==0)
args = {};
this.args = DVClone(args);
if (args['beginX']==null)
this.args['beginX'] = 0;
if (args['beginY']==null)
this.args['beginY'] = 0;
if (args['endX']==null)
this.args['endX'] = 0;
if (args['endY']==null)
this.args['endY'] = 0;
if (args['color']==null)
this.args['color'] = new DVColor();
if (args['style']==null || (args.style!="real" && args.style!="dash"))
this.args['style'] = "real";
if (args['shadow']==null)
this.args['shadow'] = true;
if (args['lineWidth']==null)
this.args['lineWidth'] = 1;
}
/**
* get the shadow according to the line's direction
* @function
* @return [0,1]
*/
DVLine.prototype.getShadow = function()
{
// if ((this.args.beginX<this.args.endX && this.args.beginY<=this.args.endY)
// || (this.args.beginX>this.args.endX && this.args.beginY>this.args.endY))
// return [0,-1]
return [0,1]
}
/**
* whether the node in the lines's region
* @function
* @param {double} x -the x value of test node
* @param {double} y -the y value of test node
* @return {boolean} result -whether (x,y) is in the line's region
*/
DVLine.prototype.between =function(x,y)
{
if (x>=Math.min(this.args['beginX'],this.args['endX']) && x<=Math.max(this.args['beginX'],this.args['endX']) &&
y>=Math.min(this.args['beginY'],this.args['endY']) && y<=Math.max(this.args['beginY'],this.args['endY']))
return true;
return false;
}
/**
* draw the line on dv's canvas
* @function
* @param {DVisual} dv - the Dvisual instance you want to draw
*/
DVLine.prototype.draw = function(dv)
{
dv.ctx.save();
dv.ctx.fillStyle = this.args.color.tostring();
dv.ctx.strokeStyle = this.args.color.tostring();
dv.ctx.lineWidth = this.args['lineWidth'];
if (this.args['shadow'])
{
if (this.shadowLine==null)
{
shadowArgs = DVClone(this.args);
shadowArgs['color'] = new DVColor(100,100,100,0.3);
shadowArgs['shadow'] = false;
shadow = this.getShadow();
shadowArgs['beginX']+=shadow[0];
shadowArgs['beginY']+=shadow[1];
shadowArgs['endX']+=shadow[0];
shadowArgs['endY']+=shadow[1];
this.shadowLine = new DVLine(shadowArgs);
}
this.shadowLine.draw(dv);
}
if (this.args['style']=='real')
{
dv.ctx.beginPath();
dv.ctx.moveTo(this.args.beginX,this.args.beginY);
dv.ctx.lineTo(this.args.endX,this.args.endY);
dv.ctx.closePath();
dv.ctx.fill();
dv.ctx.stroke();
}
if (this.args['style']=='dash')
{
dv.ctx.beginPath();
xinc = this.args['endX'] - this.args['beginX'];
yinc = this.args['endY'] - this.args['beginY'];
length = Math.sqrt(xinc*xinc+yinc*yinc);
doted = Math.max(length*1.0/50,5);
xinc*=doted/length;
yinc*=doted/length;
x = this.args['beginX'];
y = this.args['beginY'];
while (this.between(x+xinc,y+yinc))
{
dv.ctx.moveTo(x,y)
dv.ctx.lineTo(x+xinc,y+yinc)
x+=2*xinc;
y+=2*yinc;
}
dv.ctx.moveTo(x,y)
dv.ctx.lineTo(this.args['endX'],this.args['endY'])
dv.ctx.closePath();
dv.ctx.stroke();
}
dv.ctx.restore();
}
/**
* A DVisual graph element indicate a quadratic Curve
* @constructor
* @example new DVLine({'beginX':100,'beginY':100,'endX':20,'endY':20,'style':'dash'});
* @param {Object[]} args - a array contain arguments below
* @param {double} args.beginX - the x value of the start node
* @param {double} args.beginY - the y value of the start node
* @param {double} args.endX - the x value of the stop node
* @param {double} args.endY - the y value of the stop node
* @param {double} args.cpx - the x value of the control node
* @param {double} args.cpy - the y value of the control node
* @param {DVColor=} [args.color = new DVColor()] - the color of the dot,black in default
* @param {double=} [args.lineWidth = '1'] - the lineWidth of line
*/
function DVCurve(args)
{
if (arguments.length==0)
args = {};
this.args = DVClone(args);
if (args['beginX']==null)
this.args['beginX'] = 0;
if (args['beginY']==null)
this.args['beginY'] = 0;
if (args['endX']==null)
this.args['endX'] = 0;
if (args['endY']==null)
this.args['endY'] = 0;
if (args['color']==null)
this.args['color'] = new DVColor();
if (args['lineWidth']==null)
this.args['lineWidth'] = 1;
}
/**
* draw the curve on dv's canvas
* @function
* @param {DVisual} dv - the Dvisual instance you want to draw
*/
DVCurve.prototype.draw = function(dv)
{
dv.ctx.save();
dv.ctx.fillStyle = this.args.color.tostring();
dv.ctx.strokeStyle = this.args.color.tostring();
dv.ctx.lineWidth = this.args['lineWidth'];
dv.ctx.beginPath();
dv.ctx.moveTo(this.args.beginX,this.args.beginY);
dv.ctx.quadraticCurveTo(this.args.cpx,this.args.cpy,this.args.endX,this.args.endY);
dv.ctx.stroke();
dv.ctx.restore();
}
/**
* A DVisual graph element indicate a polygon
* @constructor
* @example new DVPolygon({'X':[10,10,20,20],'Y':[10,20,20,10],'style':'stroke'});
* @param {Object[]} args - a array contain arguments below
* @param {Array(double)} args.X - the set of a series nodes' x value
* @param {Array(double)} args.Y - the set of a series nodes' y value
* @param {DVColor=} [args.color = new DVColor()] - the color of the dot,black in default
* @param {string=} [args.style ='fill']- the style of this dot,should be one of 'fill','stroke'
* @param {boolean=} [args.shadow =true] - whether draw text's shadow.
* @param {double=} [args.lineWidth = '1'] - the lineWidth of text
*/
function DVPolygon(args)
{
if (arguments.length==0)
args = {};
this.args = DVClone(args);
if (args['X']==null)
this.args['X'] = [];
if (args['Y']==null)
this.args['Y'] = [];
if (this.args.X.length!=this.args.Y.length)
return null;
if (args['color']==null)
this.args['color'] = new DVColor();
if (args['style']==null || (args.style!="fill" && args.style!="stroke" && args.style!="transFill"))
this.args['style'] = "transFill";
if (args['shadow']==null)
this.args['shadow'] = true;
if (args['lineWidth']==null)
this.args['lineWidth'] = 1;
}
/**
* draw the polygon on dv's canvas
* @function
* @param {DVisual} dv - the Dvisual instance you want to draw
*/
DVPolygon.prototype.draw = function(dv)
{
dv.ctx.save();
dv.ctx.fillStyle = this.args.color.tostring();
dv.ctx.strokeStyle = this.args.color.tostring();
dv.ctx.lineWidth = this.args['lineWidth'];
if (this.args['shadow'])
{
if (this.shadowPoly==null)
{
shadowArgs = DVClone(this.args);
shadowArgs['color'] = new DVColor(200,200,200,0.3);
shadowArgs['shadow'] = false;
for (var i=0;i<shadowArgs.X.length;i++ )
{
shadowArgs.X[i]+=1;
shadowArgs.Y[i]+=1;
}
this.shadowPoly = new DVPolygon(shadowArgs);
}
this.shadowPoly.draw(dv);
}
if (this.args['style']=='stroke' || this.args['style']=='fill')
{
dv.ctx.beginPath();
dv.ctx.moveTo(this.args.X[0],this.args.Y[0]);
for (var i=0;i<this.args.X.length;i++)
{
dv.ctx.lineTo(this.args.X[(i+1)%this.args.X.length],this.args.Y[(i+1)%this.args.X.length]);
}
dv.ctx.closePath();
if (this.args['style']=='stroke')
dv.ctx.stroke();
if (this.args['style']=='fill')
dv.ctx.fill();
}
if (this.args['style']=='transFill')
{
dv.ctx.beginPath();
dv.ctx.moveTo(this.args.X[0],this.args.Y[0]);
for (var i=0;i<this.args.X.length;i++)
{
dv.ctx.lineTo(this.args.X[(i+1)%this.args.X.length],this.args.Y[(i+1)%this.args.X.length]);
}
dv.ctx.closePath();
dv.ctx.stroke();
dv.ctx.fillStyle = (new DVColor(this.args.color.r,this.args.color.g,this.args.color.b,0.7)).tostring();
dv.ctx.beginPath();
dv.ctx.moveTo(this.args.X[0],this.args.Y[0]);
for (var i=0;i<this.args.X.length;i++)
{
dv.ctx.lineTo(this.args.X[(i+1)%this.args.X.length],this.args.Y[(i+1)%this.args.X.length]);
}
dv.ctx.closePath();
dv.ctx.fill();
}
dv.ctx.restore();
}
/**
* A DVisual graph element indicate a Rect
* @constructor
* @example new DVLine({'beginX':100,'beginY':100,'endX':20,'endY':20,'style':'dash'});
* @param {Object[]} args - a array contain arguments below
* @param {double} args.x - the x value of the Rect's start node(left top node)
* @param {double} args.y - the y value of the Rect's start node(left top node)
* @param {double} args.height - the height of the Rect
* @param {double} args.y - the width of the Rect
* @param {others=} [args.others] - !!!the same with DVPolygon's arguments.!!!(others is not an argument,but an annotation)
*/
function DVRect(args)
{
if (arguments.length==0)
args = {};
this.args = DVClone(args);
if (args['x']==null)
this.args['x'] = 0;
if (args['y']==null)
this.args['y'] = 0;
if (args['height']==null)
this.args['height'] = 0;
if (args['width']==null)
this.args['width'] = 0;
}
/**
* draw the Rect on dv's canvas
* @function
* @param {DVisual} dv - the Dvisual instance you want to draw
*/
DVRect.prototype.draw = function(dv)
{
if (this.polyRect==null)
{
this.args['X'] = [this.args['x'],this.args['x'],this.args['x']+this.args['width'],this.args['x']+this.args['width']];
this.args['Y'] = [this.args['y'],this.args['y']+this.args['height'],this.args['y']+this.args['height'],this.args['y']];
this.polyRect = new DVPolygon(this.args);
}
this.polyRect.draw(dv);
}
/**
* A DVisual graph element indicate a Coordinate,the main structure of most chart
* @constructor
* @example new DVCoordinate({'xDescript':"time",'yDescript':"value",'xSpan':20,'ySpan'});
* @param {Object[]} args - a array contain arguments below
* @param {boolean} args.xGrid - whether draw the grid line started from X axes
* @param {boolean} args.yGrid - whether draw the grid line started from Y axes
* @param {string=} [args.xStyle='value'] - the X axes's style,'value' or 'class'
* @param {string=} [args.yStyle='value'] - the Y axes's style,'value' or 'percentage%'