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Team:Evry/arbor/src/graphics/graphics.js
From 2012.igem.org
// // graphics.js // // Created by Christian Swinehart on 2010-12-07. // Copyright (c) 2011 Samizdat Drafting Co. All rights reserved. //
var Graphics = function(canvas){
var dom = $(canvas)
var ctx = $(dom).get(0).getContext('2d')
var _bounds = null
var _colorMode = "rgb" // vs hsb var _coordMode = "origin" // vs "center"
var _drawLibrary = {}
var _drawStyle = {background:null,
fill:null,
stroke:null,
width:0}
var _fontLibrary = {}
var _fontStyle = {font:"sans-serif",
size:12,
align:"left",
color:Colors.decode("black"),
alpha:1,
baseline:"ideographic"}
var _lineBuffer = [] // calls to .lines sit here until flushed by .drawlines ///MACRO:primitives-start var primitives = Primitives(ctx, _drawStyle, _fontStyle) var _Oval = primitives._Oval var _Rect = primitives._Rect var _Color = primitives._Color var _Path = primitives._Path ///MACRO:primitives-end
// drawStyle({background:"color" or {r,g,b,a},
// fill:"color" or {r,g,b,a},
// stroke:"color" or {r,g,b,a},
// alpha:<number>,
// weight:<number>})
var that = {
init:function(){
if (!ctx) return null
return that
},
// canvas-wide settings
size:function(width,height){
if (!isNaN(width) && !isNaN(height)){
dom.attr({width:width,height:height})
// if (_drawStyle.fill!==null) that.fill(_drawStyle.fill)
// if (_drawStyle.stroke!==null) that.stroke(_drawStyle.stroke)
// that.textStyle(_fontStyle)
// trace(_drawStyle,_fontStyle)
}
return {width:dom.attr('width'), height:dom.attr('height')}
},
clear:function(x,y,w,h){
if (arguments.length<4){
x=0; y=0
w=dom.attr('width')
h=dom.attr('height')
}
ctx.clearRect(x,y,w,h)
if (_drawStyle.background!==null){
ctx.save()
ctx.fillStyle = Colors.encode(_drawStyle.background)
ctx.fillRect(x,y,w,h)
ctx.restore()
}
},
background:function(a,b,c,d){
if (a==null){
_drawStyle.background = null
return null
}
var fillColor = Colors.decode(a,b,c,d)
if (fillColor){
_drawStyle.background = fillColor
that.clear()
}
},
// drawing to screen
noFill:function(){
_drawStyle.fill = null
},
fill:function(a,b,c,d){
if (arguments.length==0){
return _drawStyle.fill
}else if (arguments.length>0){
var fillColor = Colors.decode(a,b,c,d)
_drawStyle.fill = fillColor
ctx.fillStyle = Colors.encode(fillColor)
}
},
noStroke:function(){
_drawStyle.stroke = null
ctx.strokeStyle = null
},
stroke:function(a,b,c,d){
if (arguments.length==0 && _drawStyle.stroke!==null){
return _drawStyle.stroke
}else if (arguments.length>0){
var strokeColor = Colors.decode(a,b,c,d)
_drawStyle.stroke = strokeColor
ctx.strokeStyle = Colors.encode(strokeColor)
}
},
strokeWidth:function(ptsize){
if (ptsize===undefined) return ctx.lineWidth
ctx.lineWidth = _drawStyle.width = ptsize
},
Color:function(clr){
return new _Color(clr)
},
// Font:function(fontName, pointSize){
// return new _Font(fontName, pointSize)
// },
// font:function(fontName, pointSize){
// if (fontName!==undefined) _fontStyle.font = fontName
// if (pointSize!==undefined) _fontStyle.size = pointSize
// ctx.font = nano("{size}px {font}", _fontStyle)
// },
drawStyle:function(style){
// without arguments, show the current state
if (arguments.length==0) return objcopy(_drawStyle)
// if this is a ("stylename", {style}) invocation, don't change the current
// state but add it to the library
if (arguments.length==2){
var styleName = arguments[0]
var styleDef = arguments[1]
if (typeof styleName=='string' && typeof styleDef=='object'){
var newStyle = {}
if (styleDef.color!==undefined){
var textColor = Colors.decode(styleDef.color)
if (textColor) newStyle.color = textColor
}
$.each('background fill stroke width'.split(' '), function(i, param){
if (styleDef[param]!==undefined) newStyle[param] = styleDef[param]
})
if (!$.isEmptyObject(newStyle)) _drawLibrary[styleName] = newStyle
}
return
}
// if a ("stylename") invocation, load up the selected style
if (arguments.length==1 && _drawLibrary[arguments[0]]!==undefined){
style = _drawLibrary[arguments[0]]
}
// for each of the properties specified, update the canvas state
if (style.width!==undefined) _drawStyle.width = style.width
ctx.lineWidth = _drawStyle.width
$.each('background fill stroke',function(i, color){
if (style[color]!==undefined){
if (style[color]===null) _drawStyle[color] = null
else{
var useColor = Colors.decode(style[color])
if (useColor) _drawStyle[color] = useColor
}
}
})
ctx.fillStyle = _drawStyle.fill
ctx.strokeStyle = _drawStyle.stroke
},
textStyle:function(style){
// without arguments, show the current state
if (arguments.length==0) return objcopy(_fontStyle)
// if this is a ("name", {style}) invocation, don't change the current
// state but add it to the library
if (arguments.length==2){
var styleName = arguments[0]
var styleDef = arguments[1]
if (typeof styleName=='string' && typeof styleDef=='object'){
var newStyle = {}
if (styleDef.color!==undefined){
var textColor = Colors.decode(styleDef.color)
if (textColor) newStyle.color = textColor
}
$.each('font size align baseline alpha'.split(' '), function(i, param){
if (styleDef[param]!==undefined) newStyle[param] = styleDef[param]
})
if (!$.isEmptyObject(newStyle)) _fontLibrary[styleName] = newStyle
}
return
}
if (arguments.length==1 && _fontLibrary[arguments[0]]!==undefined){
style = _fontLibrary[arguments[0]]
}
if (style.font!==undefined) _fontStyle.font = style.font
if (style.size!==undefined) _fontStyle.size = style.size
ctx.font = nano("{size}px {font}", _fontStyle)
if (style.align!==undefined){
ctx.textAlign = _fontStyle.align = style.align
}
if (style.baseline!==undefined){
ctx.textBaseline = _fontStyle.baseline = style.baseline
}
if (style.alpha!==undefined) _fontStyle.alpha = style.alpha
if (style.color!==undefined){
var textColor = Colors.decode(style.color)
if (textColor) _fontStyle.color = textColor
}
if (_fontStyle.color){
var textColor = Colors.blend(_fontStyle.color, _fontStyle.alpha)
if (textColor) ctx.fillStyle = textColor
}
// trace(_fontStyle,opts)
},
text:function(textStr, x, y, opts){ // opts: x,y, color, font, align, baseline, width
if (arguments.length>=3 && !isNaN(x)){
opts = opts || {}
opts.x = x
opts.y = y
}else if (arguments.length==2 && typeof(x)=='object'){
opts = x
}else{
opts = opts || {}
}
var style = objmerge(_fontStyle, opts)
ctx.save()
if (style.align!==undefined) ctx.textAlign = style.align
if (style.baseline!==undefined) ctx.textBaseline = style.baseline
if (style.font!==undefined && !isNaN(style.size)){
ctx.font = nano("{size}px {font}", style)
}
var alpha = (style.alpha!==undefined) ? style.alpha : _fontStyle.alpha
var color = (style.color!==undefined) ? style.color : _fontStyle.color
ctx.fillStyle = Colors.blend(color, alpha)
// if (alpha>0) ctx.fillText(textStr, style.x, style.y);
if (alpha>0) ctx.fillText(textStr, Math.round(style.x), style.y);
ctx.restore()
},
textWidth:function(textStr, style){ // style: x,y, color, font, align, baseline, width
style = objmerge(_fontStyle, style||{})
ctx.save()
ctx.font = nano("{size}px {font}", style)
var width = ctx.measureText(textStr).width
ctx.restore()
return width
},
// hasFont:function(fontName){
// var testTxt = 'H h H a H m H b H u H r H g H e H r H f H o H n H s H t H i H v H'
// ctx.save()
// ctx.font = '10px sans-serif'
// var defaultWidth = ctx.measureText(testTxt).width
//
// ctx.font = '10px "'+fontName+'"'
// var putativeWidth = ctx.measureText(testTxt).width
// ctx.restore()
//
// // var defaultWidth = that.textWidth(testTxt, {font:"Times New Roman", size:120})
// // var putativeWidth = that.textWidth(testTxt, {font:fontName, size:120})
// trace(defaultWidth,putativeWidth,ctx.font)
// // return (putativeWidth!=defaultWidth || fontName=="Times New Roman")
// return putativeWidth!=defaultWidth
// },
// shape primitives.
// classes will return an {x,y,w,h, fill(), stroke()} object without drawing
// functions will draw the shape based on current stroke/fill state
Rect:function(x,y,w,h,r,style){
return new _Rect(x,y,w,h,r,style)
},
rect:function(x, y, w, h, r, style){
_Rect.prototype._draw(x,y,w,h,r,style)
},
Oval:function(x, y, w, h, style) {
return new _Oval(x,y,w,h, style)
},
oval:function(x, y, w, h, style) {
style = style || {}
_Oval.prototype._draw(x,y,w,h, style)
},
// draw a line immediately
line:function(x1, y1, x2, y2, style){
var p = new _Path(x1,y1,x2,y2)
p.draw(style)
},
// queue up a line segment to be drawn in a batch by .drawLines
lines:function(x1, y1, x2, y2){
if (typeof y2=='number'){
// Æ’( x1, y1, x2, y2)
_lineBuffer.push( [ {x:x1,y:y1}, {x:x2,y:y2} ] )
}else{
// Æ’( {x:1, y:1}, {x:2, y:2} )
_lineBuffer.push( [ x1,y1 ] )
}
},
// flush the buffered .lines to screen
drawLines:function(style){
var p = new _Path(_lineBuffer)
p.draw(style)
_lineBuffer = []
}
} return that.init()
}
// // helpers for figuring out where to draw arrows
// var intersect_line_line = function(p1, p2, p3, p4)
// {
// var denom = ((p4.y - p3.y)*(p2.x - p1.x) - (p4.x - p3.x)*(p2.y - p1.y));
//
// // lines are parallel
// if (denom === 0) {
// return false;
// }
//
// var ua = ((p4.x - p3.x)*(p1.y - p3.y) - (p4.y - p3.y)*(p1.x - p3.x)) / denom;
// var ub = ((p2.x - p1.x)*(p1.y - p3.y) - (p2.y - p1.y)*(p1.x - p3.x)) / denom;
//
// if (ua < 0 || ua > 1 || ub < 0 || ub > 1) {
// return false;
// }
//
// return arbor.Point(p1.x + ua * (p2.x - p1.x), p1.y + ua * (p2.y - p1.y));
// }
//
// var intersect_line_box = function(p1, p2, p3, w, h)
// {
// var tl = {x: p3.x, y: p3.y};
// var tr = {x: p3.x + w, y: p3.y};
// var bl = {x: p3.x, y: p3.y + h};
// var br = {x: p3.x + w, y: p3.y + h};
//
// var result;
// if (result = intersect_line_line(p1, p2, tl, tr)) { return result; } // top
// if (result = intersect_line_line(p1, p2, tr, br)) { return result; } // right
// if (result = intersect_line_line(p1, p2, br, bl)) { return result; } // bottom
// if (result = intersect_line_line(p1, p2, bl, tl)) { return result; } // left
//
// return false;
// }
