graphics-canvas.js revision 180e0891171a381ce4fa08d3867f7226180b8282
YUI.add('graphics-canvas', function(Y) {
var SHAPE = "canvasShape",
AttributeLite = Y.AttributeLite,
PluginHost = Y.Plugin.Host,
CanvasShape,
CanvasPath,
CanvasRect,
CanvasEllipse,
CanvasCircle,
DUMMY;
/**
* Creates dom element used for converting color string to rgb
*
* @method _createDummy
* @private
*/
function _createDummy()
{
if(!DUMMY)
{
DUMMY = Y.config.doc.createElement('div');
}
DUMMY.style.height = 0;
DUMMY.style.width = 0;
DUMMY.style.overflow = 'hidden';
Y.config.doc.documentElement.appendChild(DUMMY);
return DUMMY;
}
/**
* Set of drawing apis for canvas based classes.
*
* @class CanvasDrawing
* @constructor
*/
function CanvasDrawing()
{
}
CanvasDrawing.prototype = {
/**
* Regex expression used for converting hex strings to rgb
*
* @property _reHex
* @private
*/
_reHex: /^#?([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})$/i,
/**
* Parses hex color string and alpha value to rgba
*
* @method _2RGBA
* @private
*/
_2RGBA: function(val, alpha) {
alpha = (alpha !== undefined) ? alpha : 1;
if (this._reHex.exec(val)) {
val = 'rgba(' + [
parseInt(RegExp.$1, 16),
parseInt(RegExp.$2, 16),
parseInt(RegExp.$3, 16)
].join(',') + ',' + alpha + ')';
}
return val;
},
/**
* Converts color to rgb format
*
* @method _2RGB
* @private
*/
_2RGB: function(val) {
var dummy = _createDummy();
dummy.style.background = val;
return dummy.style.backgroundColor;
},
/**
* Sets the size of the graphics object.
*
* @method setSize
* @param w {Number} width to set for the instance.
* @param h {Number} height to set for the instance.
*/
setSize: function(w, h) {
if(this.get("autoSize"))
{
if(w > this.node.getAttribute("width"))
{
this.node.style.width = w + "px";
this.node.setAttribute("width", w);
}
if(h > this.node.getAttribute("height"))
{
this.node.style.height = h + "px";
this.node.setAttribute("height", h);
}
}
},
/**
* @private
*/
_updatePosition: function(x, y)
{
this._updateCoords(x, y);
if(x <= this._left)
{
this._left = x;
}
else if(x >= this._right)
{
this._right = x;
}
if(y <= this._top)
{
this._top = y;
}
else if(y >= this._bottom)
{
this._bottom = y;
}
this._width = this._right - this._left;
this._height = this._bottom - this._top;
},
/**
* @private
*/
_updateCoords: function(x, y)
{
this._xcoords.push(x);
this._ycoords.push(y);
},
/**
* @private
*/
_clearAndUpdateCoords: function()
{
var x = this._xcoords.pop() || 0,
y = this._ycoords.pop() || 0;
this._updateCoords(x, y);
},
/**
* @private
*/
_updateNodePosition: function()
{
var node = this.get("node"),
x = this.get("x"),
y = this.get("y");
node.style.position = "absolute";
node.style.left = (x + this._left) + "px";
node.style.top = (y + this._top) + "px";
},
/**
* Holds queue of methods for the target canvas.
*
* @property _methods
* @type Object
* @private
*/
_methods: null,
/**
* Holds queue of properties for the target canvas.
*
* @property _properties
* @type Object
* @private
*/
_properties: null,
/**
* Adds a method to the drawing queue
*/
_updateDrawingQueue: function(val)
{
if(!this._methods)
{
this._methods = [];
}
this._methods.push(val);
},
/**
* Draws a line segment using the current line style from the current drawing position to the specified x and y coordinates.
*
* @method lineTo
* @param {Number} point1 x-coordinate for the end point.
* @param {Number} point2 y-coordinate for the end point.
*/
lineTo: function(point1, point2, etc) {
var args = arguments,
i, len;
if(!this._lineToMethods)
{
this._lineToMethods = [];
}
if (typeof point1 === 'string' || typeof point1 === 'number') {
args = [[point1, point2]];
}
for (i = 0, len = args.length; i < len; ++i) {
this._updateDrawingQueue(["lineTo", args[i][0], args[i][1]]);
this._lineToMethods[this._lineToMethods.length] = this._methods[this._methods.length - 1];
this._updateShapeProps.apply(this, args[i]);
this._updatePosition(args[i][0], args[i][1]);
}
this._drawingComplete = false;
return this;
},
/**
* Moves the current drawing position to specified x and y coordinates.
*
* @method moveTo
* @param {Number} x x-coordinate for the end point.
* @param {Number} y y-coordinate for the end point.
*/
moveTo: function(x, y) {
this._updateDrawingQueue(["moveTo", x, y]);
this._updateShapeProps(x, y);
this._updatePosition(x, y);
this._drawingComplete = false;
return this;
},
/**
* Draws a bezier curve.
*
* @method curveTo
* @param {Number} cp1x x-coordinate for the first control point.
* @param {Number} cp1y y-coordinate for the first control point.
* @param {Number} cp2x x-coordinate for the second control point.
* @param {Number} cp2y y-coordinate for the second control point.
* @param {Number} x x-coordinate for the end point.
* @param {Number} y y-coordinate for the end point.
*/
curveTo: function(cp1x, cp1y, cp2x, cp2y, x, y) {
var hiX,
hiY,
loX,
loY;
this._updateDrawingQueue(["bezierCurveTo", cp1x, cp1y, cp2x, cp2y, x, y]);
this._drawingComplete = false;
this._updateShapeProps(x, y);
hiX = Math.max(x, Math.max(cp1x, cp2x));
hiY = Math.max(y, Math.max(cp1y, cp2y));
loX = Math.min(x, Math.min(cp1x, cp2x));
loY = Math.min(y, Math.min(cp1y, cp2y));
this._updatePosition(hiX, hiY);
this._updatePosition(loX, loY);
return this;
},
/**
* Draws a quadratic bezier curve.
*
* @method quadraticCurveTo
* @param {Number} cpx x-coordinate for the control point.
* @param {Number} cpy y-coordinate for the control point.
* @param {Number} x x-coordinate for the end point.
* @param {Number} y y-coordinate for the end point.
*/
quadraticCurveTo: function(cpx, cpy, x, y) {
var hiX,
hiY,
loX,
loY;
this._updateDrawingQueue(["quadraticCurveTo", cpx, cpy, x, y]);
this._drawingComplete = false;
this._updateShapeProps(x, y);
hiX = Math.max(x, cpx);
hiY = Math.max(y, cpy);
loX = Math.min(x, cpx);
loY = Math.min(y, cpy);
this._updatePosition(hiX, hiY);
this._updatePosition(loX, loY);
return this;
},
/**
* Draws a circle.
*
* @method drawCircle
* @param {Number} x y-coordinate
* @param {Number} y x-coordinate
* @param {Number} r radius
*/
drawCircle: function(x, y, radius) {
var startAngle = 0,
endAngle = 2 * Math.PI,
circum = radius * 2;
this._shape = {
x:x,
y:y,
w:circum,
h:circum
};
this._drawingComplete = false;
this._updatePosition(x + circum, y + circum);
this._updateDrawingQueue(["arc", x + radius, y + radius, radius, startAngle, endAngle, false]);
return this;
},
/**
* Draws an ellipse.
*
* @method drawEllipse
* @param {Number} x x-coordinate
* @param {Number} y y-coordinate
* @param {Number} w width
* @param {Number} h height
*/
drawEllipse: function(x, y, w, h) {
this._shape = {
x:x,
y:y,
w:w,
h:h
};
if(this._stroke && this._strokeWeight > 0)
{
w -= this._strokeWeight * 2;
h -= this._strokeWeight * 2;
x += this._strokeWeight;
y += this._strokeWeight;
}
var l = 8,
theta = -(45/180) * Math.PI,
angle = 0,
angleMid,
radius = w/2,
yRadius = h/2,
i = 0,
centerX = x + radius,
centerY = y + yRadius,
ax, ay, bx, by, cx, cy;
ax = centerX + Math.cos(0) * radius;
ay = centerY + Math.sin(0) * yRadius;
this.moveTo(ax, ay);
for(; i < l; i++)
{
angle += theta;
angleMid = angle - (theta / 2);
bx = centerX + Math.cos(angle) * radius;
by = centerY + Math.sin(angle) * yRadius;
cx = centerX + Math.cos(angleMid) * (radius / Math.cos(theta / 2));
cy = centerY + Math.sin(angleMid) * (yRadius / Math.cos(theta / 2));
this.quadraticCurveTo(cx, cy, bx, by);
}
this._trackPos(x, y);
this._trackSize(x + w, y + h);
return this;
},
/**
* Draws a rectangle.
*
* @method drawRect
* @param {Number} x x-coordinate
* @param {Number} y y-coordinate
* @param {Number} w width
* @param {Number} h height
*/
drawRect: function(x, y, w, h) {
this._shape = {
x:x,
y:y,
w:w,
h:h
};
this._drawingComplete = false;
this.moveTo(x, y);
this.lineTo(x + w, y);
this.lineTo(x + w, y + h);
this.lineTo(x, y + h);
this.lineTo(x, y);
return this;
},
/**
* Draws a rectangle with rounded corners.
*
* @method drawRect
* @param {Number} x x-coordinate
* @param {Number} y y-coordinate
* @param {Number} w width
* @param {Number} h height
* @param {Number} ew width of the ellipse used to draw the rounded corners
* @param {Number} eh height of the ellipse used to draw the rounded corners
*/
drawRoundRect: function(x, y, w, h, ew, eh) {
this._shape = {
x:x,
y:y,
w:w,
h:h
};
this._drawingComplete = false;
this._updateDrawingQueue(["moveTo", x, y + eh]);
this._updateDrawingQueue(["lineTo", x, y + h - eh]);
this._updateDrawingQueue(["quadraticCurveTo", x, y + h, x + ew, y + h]);
this._updateDrawingQueue(["lineTo", x + w - ew, y + h]);
this._updateDrawingQueue(["quadraticCurveTo", x + w, y + h, x + w, y + h - eh]);
this._updateDrawingQueue(["lineTo", x + w, y + eh]);
this._updateDrawingQueue(["quadraticCurveTo", x + w, y, x + w - ew, y]);
this._updateDrawingQueue(["lineTo", x + ew, y]);
this._updateDrawingQueue(["quadraticCurveTo", x, y, x, y + eh]);
this._trackPos(x, y);
this._trackSize(w, h);
this._paint();
return this;
},
/**
* @private
* Draws a wedge.
*
* @param x x component of the wedge's center point
* @param y y component of the wedge's center point
* @param startAngle starting angle in degrees
* @param arc sweep of the wedge. Negative values draw clockwise.
* @param radius radius of wedge. If [optional] yRadius is defined, then radius is the x radius.
* @param yRadius [optional] y radius for wedge.
*/
drawWedge: function(cfg)
{
var x = cfg.x,
y = cfg.y,
startAngle = cfg.startAngle,
arc = cfg.arc,
radius = cfg.radius,
yRadius = cfg.yRadius,
segs,
segAngle,
theta,
angle,
angleMid,
ax,
ay,
bx,
by,
cx,
cy,
i = 0;
this._drawingComplete = false;
// move to x,y position
this._updateRenderQueue(["moveTo", x, y]);
yRadius = yRadius || radius;
// limit sweep to reasonable numbers
if(Math.abs(arc) > 360)
{
arc = 360;
}
// First we calculate how many segments are needed
// for a smooth arc.
segs = Math.ceil(Math.abs(arc) / 45);
// Now calculate the sweep of each segment.
segAngle = arc / segs;
// The math requires radians rather than degrees. To convert from degrees
// use the formula (degrees/180)*Math.PI to get radians.
theta = -(segAngle / 180) * Math.PI;
// convert angle startAngle to radians
angle = -(startAngle / 180) * Math.PI;
// draw the curve in segments no larger than 45 degrees.
if(segs > 0)
{
// draw a line from the center to the start of the curve
ax = x + Math.cos(startAngle / 180 * Math.PI) * radius;
ay = y + Math.sin(-startAngle / 180 * Math.PI) * yRadius;
this.lineTo(ax, ay);
// Loop for drawing curve segments
for(; i < segs; ++i)
{
angle += theta;
angleMid = angle - (theta / 2);
bx = x + Math.cos(angle) * radius;
by = y + Math.sin(angle) * yRadius;
cx = x + Math.cos(angleMid) * (radius / Math.cos(theta / 2));
cy = y + Math.sin(angleMid) * (yRadius / Math.cos(theta / 2));
this._updateRenderQueue(["quadraticCurveTo", cx, cy, bx, by]);
}
// close the wedge by drawing a line to the center
this._updateRenderQueue(["lineTo", x, y]);
}
this._trackPos(x, y);
this._trackSize(radius, radius);
this._paint();
},
/**
* Completes a drawing operation.
*
* @method end
*/
end: function() {
this._paint();
return this;
},
/**
* Returns a linear gradient fill
*
* @method _getLinearGradient
* @private
*/
_getLinearGradient: function() {
var isNumber = Y.Lang.isNumber,
fill = this.get("fill"),
stops = fill.stops,
opacity,
color,
stop,
i = 0,
len = stops.length,
gradient,
x = 0,
y = 0,
w = this.get("width"),
h = this.get("height"),
r = fill.rotation,
x1, x2, y1, y2,
cx = x + w/2,
cy = y + h/2,
offset,
radCon = Math.PI/180,
tanRadians = parseFloat(parseFloat(Math.tan(r * radCon)).toFixed(8));
if(Math.abs(tanRadians) * w/2 >= h/2)
{
if(r < 180)
{
y1 = y;
y2 = y + h;
}
else
{
y1 = y + h;
y2 = y;
}
x1 = cx - ((cy - y1)/tanRadians);
x2 = cx - ((cy - y2)/tanRadians);
}
else
{
if(r > 90 && r < 270)
{
x1 = x + w;
x2 = x;
}
else
{
x1 = x;
x2 = x + w;
}
y1 = ((tanRadians * (cx - x1)) - cy) * -1;
y2 = ((tanRadians * (cx - x2)) - cy) * -1;
}
gradient = this._context.createLinearGradient(x1, y1, x2, y2);
for(; i < len; ++i)
{
stop = stops[i];
opacity = stop.opacity;
color = stop.color;
offset = stop.offset;
if(isNumber(opacity))
{
opacity = Math.max(0, Math.min(1, opacity));
color = this._2RGBA(color, opacity);
}
else
{
color = this._2RGB(color);
}
offset = stop.offset || i/(len - 1);
gradient.addColorStop(offset, color);
}
return gradient;
},
/**
* Returns a radial gradient fill
*
* @method _getRadialGradient
* @private
*/
_getRadialGradient: function() {
var isNumber = Y.Lang.isNumber,
fill = this.get("fill"),
r = fill.r,
fx = fill.fx,
fy = fill.fy,
stops = fill.stops,
opacity,
color,
stop,
i = 0,
len = stops.length,
gradient,
x = 0,
y = 0,
w = this.get("width"),
h = this.get("height"),
x1, x2, y1, y2, r2,
xc, yc, xn, yn, d,
offset,
ratio,
stopMultiplier;
xc = x + w/2;
yc = y + h/2;
x1 = w * fx;
y1 = h * fy;
x2 = x + w/2;
y2 = y + h/2;
r2 = w * r;
d = Math.sqrt( Math.pow(Math.abs(xc - x1), 2) + Math.pow(Math.abs(yc - y1), 2) );
if(d >= r2)
{
ratio = d/r2;
//hack. gradient won't show if it is exactly on the edge of the arc
if(ratio === 1)
{
ratio = 1.01;
}
xn = (x1 - xc)/ratio;
yn = (y1 - yc)/ratio;
xn = xn > 0 ? Math.floor(xn) : Math.ceil(xn);
yn = yn > 0 ? Math.floor(yn) : Math.ceil(yn);
x1 = xc + xn;
y1 = yc + yn;
}
//If the gradient radius is greater than the circle's, adjusting the radius stretches the gradient properly.
//If the gradient radius is less than the circle's, adjusting the radius of the gradient will not work.
//Instead, adjust the color stops to reflect the smaller radius.
if(r >= 0.5)
{
gradient = this._context.createRadialGradient(x1, y1, r, x2, y2, r * w);
stopMultiplier = 1;
}
else
{
gradient = this._context.createRadialGradient(x1, y1, r, x2, y2, w/2);
stopMultiplier = r * 2;
}
for(; i < len; ++i)
{
stop = stops[i];
opacity = stop.opacity;
color = stop.color;
offset = stop.offset;
if(isNumber(opacity))
{
opacity = Math.max(0, Math.min(1, opacity));
color = this._2RGBA(color, opacity);
}
else
{
color = this._2RGB(color);
}
offset = stop.offset || i/(len - 1);
offset *= stopMultiplier;
if(offset <= 1)
{
gradient.addColorStop(offset, color);
}
}
return gradient;
},
/**
* Clears all values
*
* @method _initProps
* @private
*/
_initProps: function() {
this._methods = [];
this._lineToMethods = [];
this._xcoords = [0];
this._ycoords = [0];
this._width = 0;
this._height = 0;
this._left = 0;
this._top = 0;
this._right = 0;
this._bottom = 0;
this._x = 0;
this._y = 0;
},
/**
* @private
*/
_drawingComplete: false,
/**
* Creates canvas element
*
* @method _createGraphic
* @private
*/
_createGraphic: function(config) {
var graphic = Y.config.doc.createElement('canvas');
return graphic;
},
/**
* Updates the size of the graphics object
*
* @method _trackSize
* @param {Number} w width
* @param {Number} h height
* @private
*/
_trackSize: function(w, h) {
if (w > this._width) {
this._width = w;
}
if (h > this._height) {
this._height = h;
}
},
/**
* Updates the position of the current drawing
*
* @method _trackPos
* @param {Number} x x-coordinate
* @param {Number} y y-coordinate
* @private
*/
_trackPos: function(x, y) {
if (x > this._x) {
this._x = x;
}
if (y > this._y) {
this._y = y;
}
},
/**
* Updates the position and size of the current drawing
*
* @method _updateShapeProps
* @param {Number} x x-coordinate
* @param {Number} y y-coordinate
* @private
*/
_updateShapeProps: function(x, y)
{
var w,h;
if(!this._shape)
{
this._shape = {};
}
if(!this._shape.x)
{
this._shape.x = x;
}
else
{
this._shape.x = Math.min(this._shape.x, x);
}
if(!this._shape.y)
{
this._shape.y = y;
}
else
{
this._shape.y = Math.min(this._shape.y, y);
}
w = Math.abs(x - this._shape.x);
if(!this._shape.w)
{
this._shape.w = w;
}
else
{
this._shape.w = Math.max(w, this._shape.w);
}
h = Math.abs(y - this._shape.y);
if(!this._shape.h)
{
this._shape.h = h;
}
else
{
this._shape.h = Math.max(h, this._shape.h);
}
}
};
Y.CanvasDrawing = CanvasDrawing;
/**
* Base class for creating shapes.
*
* @class CanvasShape
*/
CanvasShape = function(cfg)
{
var host = this,
PluginHost = Y.Plugin && Y.Plugin.Host;
if (host._initPlugins && PluginHost) {
PluginHost.call(host);
}
host.name = host.constructor.NAME;
host._eventPrefix = host.constructor.EVENT_PREFIX || host.constructor.NAME;
AttributeLite.call(host);
host.addAttrs(cfg);
host.init.apply(this, arguments);
if (host._initPlugins) {
// Need to initPlugins manually, to handle constructor parsing, static Plug parsing
host._initPlugins(cfg);
}
host.initialized = true;
};
CanvasShape.NAME = "canvasShape";
CanvasShape.prototype = Y.merge(Y.CanvasDrawing.prototype, {
init: function()
{
this.initializer.apply(this, arguments);
},
/**
* Initializes the shape
*
* @private
* @method _initialize
*/
initializer: function(cfg)
{
var host = this;
host.createNode();
host._graphic = cfg.graphic;
host._xcoords = [0];
host._ycoords = [0];
/*
host.get("stroke");
host.get("fill");
node.setAttribute("width", host.get("width"));
node.setAttribute("height", host.get("height"));
*/
host._updateHandler();
},
/**
* Add a class name to each node.
*
* @method addClass
* @param {String} className the class name to add to the node's class attribute
*/
addClass: function(className)
{
var node = Y.one(this.get("node"));
node.addClass(className);
},
/**
* Removes a class name from each node.
*
* @method removeClass
* @param {String} className the class name to remove from the node's class attribute
*/
removeClass: function(className)
{
var node = Y.one(this.get("node"));
node.removeClass(className);
},
/**
* Gets the current position of the node in page coordinates.
*
* @method getXY
* @return Array The XY position of the shape.
*/
getXY: function()
{
var graphic = this.get("graphic"),
parentXY = graphic.getXY(),
x = this.get("x"),
y = this.get("y");
return [parentXY[0] + x, parentXY[1] + y];
},
/**
* Set the position of the shape in page coordinates, regardless of how the node is positioned.
*
* @method setXY
* @param {Array} Contains X & Y values for new position (coordinates are page-based)
*/
setXY: function(xy)
{
var graphic = this.get("graphic"),
parentXY = graphic.getXY(),
x = xy[0] - parentXY[0],
y = xy[1] - parentXY[1];
this._set("x", x);
this._set("y", y);
this._updateNodePosition(x, y);
},
/**
* Determines whether the node is an ancestor of another HTML element in the DOM hierarchy.
*
* @method contains
* @param {CanvasShape | HTMLElement} needle The possible node or descendent
* @return Boolean Whether or not this shape is the needle or its ancestor.
*/
contains: function(needle)
{
return needle === Y.one(this.node);
},
/**
* Test if the supplied node matches the supplied selector.
*
* @method test
* @param {String} selector The CSS selector to test against.
* @return Boolean Wheter or not the shape matches the selector.
*/
test: function(selector)
{
return Y.one(this.get("node")).test(selector);
//return Y.Selector.test(this.node, selector);
},
/**
* Compares nodes to determine if they match.
* Node instances can be compared to each other and/or HTMLElements.
* @method compareTo
* @param {HTMLElement | Node} refNode The reference node to compare to the node.
* @return {Boolean} True if the nodes match, false if they do not.
*/
compareTo: function(refNode) {
var node = this.node;
return node === refNode;
},
/**
* Value function for fill attribute
*
* @private
* @method _getDefaultFill
* @return Object
*/
_getDefaultFill: function() {
return {
type: "solid",
cx: 0.5,
cy: 0.5,
fx: 0.5,
fy: 0.5,
r: 0.5
};
},
/**
* Value function for stroke attribute
*
* @private
* @method _getDefaultStroke
* @return Object
*/
_getDefaultStroke: function()
{
return {
weight: 1,
dashstyle: "none",
color: "#000",
opacity: 1.0
};
},
/**
* Left edge of the path
*
* @private
*/
_left: 0,
/**
* Right edge of the path
*
* @private
*/
_right: 0,
/**
* Top edge of the path
*
* @private
*/
_top: 0,
/**
* Bottom edge of the path
*
* @private
*/
_bottom: 0,
/**
* Creates the dom node for the shape.
*
* @private
* @return HTMLElement
*/
createNode: function()
{
var node = Y.config.doc.createElement('canvas'),
id = this.get("id");
this._context = node.getContext('2d');
node.setAttribute("class", "yui3-" + SHAPE);
node.setAttribute("class", "yui3-" + this.name);
node.setAttribute("id", id);
id = "#" + id;
this.node = node;
},
/**
* @private
*/
isMouseEvent: function(type)
{
if(type.indexOf('mouse') > -1 || type.indexOf('click') > -1)
{
return true;
}
return false;
},
/**
* @private
*/
before: function(type, fn)
{
if(this.isMouseEvent(type))
{
return Y.before(type, fn, "#" + this.get("id"));
}
return Y.on.apply(this, arguments);
},
/**
* @private
*/
on: function(type, fn)
{
if(this.isMouseEvent(type))
{
return Y.on(type, fn, "#" + this.get("id"));
}
return Y.on.apply(this, arguments);
},
/**
* @private
*/
after: function(type, fn)
{
if(this.isMouseEvent(type))
{
return Y.after(type, fn, "#" + this.get("id"));
}
return Y.on.apply(this, arguments);
},
/**
* Adds a stroke to the shape node.
*
* @method _strokeChangeHandler
* @private
*/
_setStrokeProps: function(stroke)
{
var color = stroke.color,
weight = stroke.weight,
opacity = stroke.opacity,
linejoin = stroke.linejoin || "round",
linecap = stroke.linecap || "butt",
dashstyle = stroke.dashstyle;
this._miterlimit = null;
this._dashstyle = (dashstyle && Y.Lang.isArray(dashstyle) && dashstyle.length > 1) ? dashstyle : null;
this._strokeWeight = weight;
if (weight)
{
this._stroke = 1;
}
else
{
this._stroke = 0;
}
if (opacity) {
this._strokeStyle = this._2RGBA(color, opacity);
}
else
{
this._strokeStyle = color;
}
this._linecap = linecap;
if(linejoin == "round" || linejoin == "square")
{
this._linejoin = linejoin;
}
else
{
linejoin = parseInt(linejoin, 10);
if(Y.Lang.isNumber(linejoin))
{
this._miterlimit = Math.max(linejoin, 1);
this._linejoin = "miter";
}
}
},
set: function()
{
var host = this,
val = arguments[0];
AttributeLite.prototype.set.apply(host, arguments);
if(host.initialized && val != "x" && val != "y")
{
host._updateHandler();
}
},
/**
* Adds a fill to the shape node.
*
* @method _fillChangeHandler
* @private
*/
_setFillProps: function(fill)
{
var isNumber = Y.Lang.isNumber,
color = fill.color,
opacity,
type = fill.type;
if(type == "linear" || type == "radial")
{
this._fillType = type;
}
else if(color)
{
opacity = fill.opacity;
if (isNumber(opacity))
{
opacity = Math.max(0, Math.min(1, opacity));
color = this._2RGBA(color, opacity);
}
else
{
color = this._2RGB(color);
}
this._fillColor = color;
this._fillType = 'solid';
}
else
{
this._fillColor = null;
}
},
/**
* Applies translate transformation.
*
* @method translate
* @param {Number} x The x-coordinate
* @param {Number} y The y-coordinate
* @protected
*/
translate: function(x, y)
{
var translate = "translate(" + x + "px, " + y + "px)";
this._updateTransform("translate", /translate\(.*\)/, translate);
},
/**
* Applies a skew to the x-coordinate
*
* @method skewX:q
* @param {Number} x x-coordinate
*/
skewX: function(x)
{
},
/**
* Applies a skew to the x-coordinate
*
* @method skewX:q
* @param {Number} x x-coordinate
*/
skewY: function(y)
{
},
/**
* @private
*/
_rotation: 0,
/**
* Applies a rotation.
*
* @method rotate
* @param
*/
rotate: function(deg)
{
var rotate = "rotate(" + deg + "deg)";
this._rotation = deg;
this._updateTransform("rotate", /rotate\(.*\)/, rotate);
},
/**
* An array of x, y values which indicates the transformOrigin in which to rotate the shape. Valid values range between 0 and 1 representing a
* fraction of the shape's corresponding bounding box dimension. The default value is [0.5, 0.5].
*
* @attribute transformOrigin
* @type Array
*/
_transformOrigin: function(x, y)
{
var node = this.get("node");
node.style.MozTransformOrigin = (100 * x) + "% " + (100 * y) + "%";
},
/**
* Applies a scale transform
*
* @method scale
* @param {Number} val
*/
scale: function(val)
{
},
/**
* Applies a matrix transformation
*
* @method matrix
*/
matrix: function(a, b, c, d, e, f)
{
},
/**
* @private
*/
_updateTransform: function(type, test, val)
{
var node = this.get("node"),
transform = node.style.MozTransform || node.style.webkitTransform || node.style.msTransform || node.style.OTransform,
transformOrigin = this.get("transformOrigin");
if(transform && transform.length > 0)
{
if(transform.indexOf(type) > -1)
{
transform = transform.replace(test, val);
}
else
{
transform += " " + val;
}
}
else
{
transform = val;
}
transformOrigin = (100 * transformOrigin[0]) + "% " + (100 * transformOrigin[1]) + "%";
node.style.MozTransformOrigin = transformOrigin;
node.style.webkitTransformOrigin = transformOrigin;
node.style.msTransformOrigin = transformOrigin;
node.style.OTransformOrigin = transformOrigin;
node.style.MozTransform = transform;
node.style.webkitTransform = transform;
node.style.msTransform = transform;
node.style.OTransform = transform;
},
/**
* @private
*/
_updateHandler: function()
{
this._draw();
},
/**
* @private
*/
_draw: function()
{
this._paint();
},
/**
* Completes a shape or drawing
*
* @method _paint
* @private
*/
_paint: function()
{
if(!this._methods)
{
return;
}
var node = this.get("node"),
w = this.get("width") || this._width,
h = this.get("height") || this._height,
context = this._context,
methods = [],
cachedMethods = this._methods.concat(),
i = 0,
j,
method,
args,
len = 0;
this._context.clearRect(0, 0, w, h);
if(this._methods)
{
len = cachedMethods.length;
if(!len || len < 1)
{
return;
}
for(; i < len; ++i)
{
methods[i] = cachedMethods[i].concat();
args = methods[i];
for(j = 1; j < args.length; ++j)
{
if(j % 2 === 0)
{
args[j] = args[j] - this._top;
}
else
{
args[j] = args[j] - this._left;
}
}
}
node.setAttribute("width", w);
node.setAttribute("height", h);
context.beginPath();
for(i = 0; i < len; ++i)
{
args = methods[i].concat();
if(args && args.length > 0)
{
method = args.shift();
if(method)
{
if(method && method == "lineTo" && this._dashstyle)
{
args.unshift(this._xcoords[i] - this._left, this._ycoords[i] - this._top);
this._drawDashedLine.apply(this, args);
}
else
{
context[method].apply(context, args);
}
}
}
}
if (this._fillType)
{
if(this._fillType == "linear")
{
context.fillStyle = this._getLinearGradient();
}
else if(this._fillType == "radial")
{
context.fillStyle = this._getRadialGradient();
}
else
{
context.fillStyle = this._fillColor;
}
context.closePath();
context.fill();
}
if (this._stroke) {
if(this._strokeWeight)
{
context.lineWidth = this._strokeWeight;
}
context.lineCap = this._linecap;
context.lineJoin = this._linejoin;
if(this._miterlimit)
{
context.miterLimit = this._miterlimit;
}
context.strokeStyle = this._strokeStyle;
context.stroke();
}
this._drawingComplete = true;
this._clearAndUpdateCoords();
this._updateNodePosition();
this._methods = cachedMethods;
}
},
/**
* Draws a dashed line between two points.
*
* @method _drawDashedLine
* @param {Number} xStart The x position of the start of the line
* @param {Number} yStart The y position of the start of the line
* @param {Number} xEnd The x position of the end of the line
* @param {Number} yEnd The y position of the end of the line
* @private
*/
_drawDashedLine: function(xStart, yStart, xEnd, yEnd)
{
var context = this._context,
dashsize = this._dashstyle[0],
gapsize = this._dashstyle[1],
segmentLength = dashsize + gapsize,
xDelta = xEnd - xStart,
yDelta = yEnd - yStart,
delta = Math.sqrt(Math.pow(xDelta, 2) + Math.pow(yDelta, 2)),
segmentCount = Math.floor(Math.abs(delta / segmentLength)),
radians = Math.atan2(yDelta, xDelta),
xCurrent = xStart,
yCurrent = yStart,
i;
xDelta = Math.cos(radians) * segmentLength;
yDelta = Math.sin(radians) * segmentLength;
for(i = 0; i < segmentCount; ++i)
{
context.moveTo(xCurrent, yCurrent);
context.lineTo(xCurrent + Math.cos(radians) * dashsize, yCurrent + Math.sin(radians) * dashsize);
xCurrent += xDelta;
yCurrent += yDelta;
}
context.moveTo(xCurrent, yCurrent);
delta = Math.sqrt((xEnd - xCurrent) * (xEnd - xCurrent) + (yEnd - yCurrent) * (yEnd - yCurrent));
if(delta > dashsize)
{
context.lineTo(xCurrent + Math.cos(radians) * dashsize, yCurrent + Math.sin(radians) * dashsize);
}
else if(delta > 0)
{
context.lineTo(xCurrent + Math.cos(radians) * delta, yCurrent + Math.sin(radians) * delta);
}
context.moveTo(xEnd, yEnd);
},
/**
* Clears the graphics object.
*
* @method clear
*/
clear: function() {
var w = this.get("width"),
h = this.get("height");
this._initProps();
this._context.clearRect(0, 0, w, h);
return this;
}
});
CanvasShape.ATTRS = {
/**
* An array of x, y values which indicates the transformOrigin in which to rotate the shape. Valid values range between 0 and 1 representing a
* fraction of the shape's corresponding bounding box dimension. The default value is [0.5, 0.5].
*
* @attribute transformOrigin
* @type Array
*/
transformOrigin: {
valueFn: function()
{
return [0.5, 0.5];
}
},
/**
* The rotation (in degrees) of the shape.
*
* @attribute rotation
* @type Number
*/
rotation: {
setter: function(val)
{
this.rotate(val);
},
getter: function()
{
return this._rotation;
}
},
/**
* Dom node of the shape
*
* @attribute node
* @type HTMLElement
* @readOnly
*/
node: {
readOnly: true,
getter: function()
{
return this.node;
}
},
/**
* Unique id for class instance.
*
* @attribute id
* @type String
*/
id: {
valueFn: function()
{
return Y.guid();
}
},
/**
*
* @attribute width
*/
width: {},
/**
*
* @attribute height
*/
height: {},
/**
* The x-coordinate for the shape.
*/
x: {
value: 0
},
/**
* The x-coordinate for the shape.
*/
y: {
value: 0
},
/**
* Indicates whether the shape is visible.
*
* @attribute visible
* @type Boolean
*/
visible: {
value: true,
setter: function(val){
var visibility = val ? "visible" : "hidden";
this.get("node").style.visibility = visibility;
return val;
}
},
/**
* Contains information about the fill of the shape.
* <dl>
* <dt>color</dt><dd>The color of the fill.</dd>
* <dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the fill. The default value is 1.</dd>
* </dl>
*
* @attribute fill
* @type Object
*/
fill: {
valueFn: "_getDefaultFill",
setter: function(val)
{
var fill,
tmpl = this.get("fill") || this._getDefaultFill();
fill = (val) ? Y.merge(tmpl, val) : null;
if(fill && fill.color)
{
if(fill.color === undefined || fill.color == "none")
{
fill.color = null;
}
}
this._setFillProps(fill);
return fill;
}
},
/**
* Contains information about the stroke of the shape.
* <dl>
* <dt>color</dt><dd>The color of the stroke.</dd>
* <dt>weight</dt><dd>Number that indicates the width of the stroke.</dd>
* <dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the stroke. The default value is 1.</dd>
* <dt>dashstyle</dt>Indicates whether to draw a dashed stroke. When set to "none", a solid stroke is drawn. When set to an array, the first index indicates the
* length of the dash. The second index indicates the length of gap.
* </dl>
*
* @attribute stroke
* @type Object
*/
stroke: {
valueFn: "_getDefaultStroke",
setter: function(val)
{
var tmpl = this.get("stroke") || this._getDefaultStroke();
val = (val) ? Y.merge(tmpl, val) : null;
this._setStrokeProps(val);
return val;
}
},
/**
* Indicates whether or not the instance will size itself based on its contents.
*
* @attribute autoSize
* @type Boolean
*/
autoSize: {
value: false
},
/**
* Determines whether the instance will receive mouse events.
*
* @attribute pointerEvents
* @type string
*/
pointerEvents: {
value: "visiblePainted"
},
/**
* Reference to the container Graphic.
*
* @attribute graphic
* @type Graphic
*/
graphic: {
readOnly: true,
getter: function()
{
return this._graphic;
}
}
};
//Straightup augment, no wrapper functions
Y.mix(CanvasShape, Y.AttributeLite, false, null, 1);
Y.mix(CanvasShape, Y.EventTarget, false, null, 1);
Y.mix(CanvasShape, PluginHost, false, null, 1);
CanvasShape.plug = PluginHost.plug;
CanvasShape.unplug = PluginHost.unplug;
Y.CanvasShape = CanvasShape;
/**
* The CanvasPath class creates a graphic object with editable
* properties.
*
* @class CanvasPath
* @extends CanvasShape
*/
CanvasPath = function(cfg)
{
CanvasPath.superclass.constructor.apply(this, arguments);
};
CanvasPath.NAME = "canvasPath";
Y.extend(CanvasPath, Y.CanvasShape, {
/**
* Indicates the type of shape
*
* @property _type
* @readOnly
* @type String
*/
_type: "path",
/**
* @private
*/
_addListeners: function() {},
/**
* @private
*/
_draw: function()
{
this._paint();
},
/**
* Completes a drawing operation.
*
* @method end
*/
end: function()
{
this._draw();
}
});
CanvasPath.ATTRS = Y.merge(Y.CanvasShape.ATTRS, {
/**
* Indicates the width of the shape
*
* @attribute width
* @type Number
*/
width: {
getter: function()
{
return this._width;
},
setter: function(val)
{
this._width = val;
return val;
}
},
/**
* Indicates the height of the shape
*
* @attribute height
* @type Number
*/
height: {
getter: function()
{
return this._height;
},
setter: function(val)
{
this._height = val;
return val;
}
},
/**
* Indicates the path used for the node.
*
* @attribute path
* @type String
*/
path: {
getter: function()
{
return this._path;
},
setter: function(val)
{
this._path = val;
return val;
}
}
});
Y.CanvasPath = CanvasPath;
/**
* Draws rectangles
*/
CanvasRect = function()
{
CanvasRect.superclass.constructor.apply(this, arguments);
};
CanvasRect.NAME = "canvasRect";
Y.extend(CanvasRect, Y.CanvasShape, {
/**
* Indicates the type of shape
*
* @property _type
* @readOnly
* @type String
*/
_type: "rect",
/**
* @private
*/
_draw: function()
{
this.clear();
var x = this.get("x"),
y = this.get("y"),
w = this.get("width"),
h = this.get("height");
this.drawRect(x, y, w, h);
this._paint();
}
});
CanvasRect.ATTRS = Y.CanvasShape.ATTRS;
Y.CanvasRect = CanvasRect;
/**
* Draws ellipses
*/
CanvasEllipse = function(cfg)
{
CanvasEllipse.superclass.constructor.apply(this, arguments);
};
CanvasEllipse.NAME = "canvasEllipse";
Y.extend(CanvasEllipse, CanvasShape, {
/**
* Indicates the type of shape
*
* @property _type
* @readOnly
* @type String
*/
_type: "ellipse",
/**
* @private
*/
_draw: function()
{
var w = this.get("width"),
h = this.get("height");
this.drawEllipse(0, 0, w, h);
this._paint();
}
});
CanvasEllipse.ATTRS = CanvasShape.ATTRS;
Y.CanvasEllipse = CanvasEllipse;
/**
* Draws an circle
*/
CanvasCircle = function(cfg)
{
CanvasCircle.superclass.constructor.apply(this, arguments);
};
CanvasCircle.NAME = "canvasCircle";
Y.extend(CanvasCircle, Y.CanvasShape, {
/**
* Indicates the type of shape
*
* @property _type
* @readOnly
* @type String
*/
_type: "circle",
/**
* @private
*/
_draw: function()
{
var radius = this.get("radius");
if(radius)
{
this.drawCircle(0, 0, radius);
this._paint();
}
}
});
CanvasCircle.ATTRS = Y.merge(Y.CanvasShape.ATTRS, {
/**
* Indicates the width of the shape
*
* @attribute width
* @type Number
*/
width: {
readOnly:true,
getter: function()
{
return this.get("radius") * 2;
}
},
/**
* Indicates the height of the shape
*
* @attribute height
* @type Number
*/
height: {
readOnly:true,
getter: function()
{
return this.get("radius") * 2;
}
},
/**
* Radius of the circle
*
* @attribute radius
*/
radius: {
lazyAdd: false
}
});
Y.CanvasCircle = CanvasCircle;
/**
* CanvasGraphic is a simple drawing api that allows for basic drawing operations.
*
* @class CanvasGraphic
* @constructor
*/
function CanvasGraphic(config) {
this.initializer.apply(this, arguments);
}
CanvasGraphic.prototype = {
/**
* Gets the current position of the node in page coordinates.
*
* @method getXY
* @return Array The XY position of the shape.
*/
getXY: function()
{
var node = Y.one(this.node),
xy = node.getXY();
return xy;
},
/**
* Indicates whether or not the instance will size itself based on its contents.
*
* @property autoSize
* @type String
*/
autoSize: true,
/**
* Indicates whether or not the instance will automatically redraw after a change is made to a shape.
* This property will get set to false when batching operations.
*
* @property autoDraw
* @type Boolean
* @default true
*/
autoDraw: true,
/**
* Initializes the class.
*
* @method initializer
* @private
*/
initializer: function(config) {
this._shapes = {};
config = config || {};
var w = config.width || 0,
h = config.height || 0;
this.node = Y.config.doc.createElement('div');
this.setSize(w, h);
if(config.render)
{
this.render(config.render);
}
},
/**
* Sets the size of the graphics object.
*
* @method setSize
* @param w {Number} width to set for the instance.
* @param h {Number} height to set for the instance.
*/
setSize: function(w, h) {
if(this.autoSize)
{
if(w > this.node.getAttribute("width"))
{
this.node.style.width = w + "px";
this.node.setAttribute("width", w);
}
if(h > this.node.getAttribute("height"))
{
this.node.style.height = h + "px";
this.node.setAttribute("height", h);
}
}
},
/**
* Updates the size of the graphics object
*
* @method _trackSize
* @param {Number} w width
* @param {Number} h height
* @private
*/
_trackSize: function(w, h) {
if (w > this._width) {
this._width = w;
}
if (h > this._height) {
this._height = h;
}
this.setSize(w, h);
},
/**
* Sets the positon of the graphics object.
*
* @method setPosition
* @param {Number} x x-coordinate for the object.
* @param {Number} y y-coordinate for the object.
*/
setPosition: function(x, y)
{
this.node.style.left = x + "px";
this.node.style.top = y + "px";
},
/**
* Adds the graphics node to the dom.
*
* @method render
* @param {HTMLElement} parentNode node in which to render the graphics node into.
*/
render: function(render) {
var node = this.node,
parentNode = Y.one(render),
w = parentNode.get("width") || parentNode.get("offsetWidth"),
h = parentNode.get("height") || parentNode.get("offsetHeight");
node.style.display = "block";
node.style.position = "absolute";
node.style.left = Y.one(node).getStyle("left");
node.style.top = Y.one(node).getStyle("top");
node.style.pointerEvents = "visiblePainted";
parentNode = parentNode || Y.config.doc.body;
parentNode.appendChild(this.node);
this.setSize(w, h);
return this;
},
/**
* Shows and and hides a the graphic instance.
*
* @method toggleVisible
* @param val {Boolean} indicates whether the instance should be visible.
*/
toggleVisible: function(val)
{
this.node.style.visibility = val ? "visible" : "hidden";
},
/**
* Adds a shape instance to the graphic instance.
*
* @method addShape
* @param {Shape} shape The shape instance to be added to the graphic.
*/
addShape: function(shape)
{
var node = shape.node,
parentNode = this._frag || this.node;
parentNode.appendChild(node);
if(!this._graphicsList)
{
this._graphicsList = [];
}
this._graphicsList.push(node);
},
/**
* Generates a shape instance by type.
*
* @method getShape
* @param {String} type type of shape to generate.
* @param {Object} cfg attributes for the shape
* @return Shape
*/
getShape: function(cfg)
{
cfg.graphic = this;
var shape = new this._shapeClass[cfg.type](cfg);
this._shapes[shape.get("id")] = shape;
this.addShape(shape);
return shape;
},
/**
* @private
*/
_shapeClass: {
circle: Y.CanvasCircle,
rect: Y.CanvasRect,
path: Y.CanvasPath,
ellipse: Y.CanvasEllipse
},
/**
* Allows for creating multiple shapes in order to batch appending and redraw operations.
*
* @method batch
* @param {Function} method Method to execute.
*/
batch: function(method)
{
var node = this.node,
frag = document.createDocumentFragment();
this._frag = frag;
this.autoDraw = false;
method();
node.appendChild(frag);
this._frag = null;
this.autoDraw = true;
},
/**
* Removes all nodes.
*
* @method destroy
*/
destroy: function()
{
this._removeChildren(this.node);
if(this.node && this.node.parentNode)
{
this.node.parentNode.removeChild(this.node);
}
},
/**
* Removes all child nodes.
*
* @method _removeChildren
* @param {HTMLElement} node
* @private
*/
_removeChildren: function(node)
{
if(node.hasChildNodes())
{
var child;
while(node.firstChild)
{
child = node.firstChild;
this._removeChildren(child);
node.removeChild(child);
}
}
}
};
Y.CanvasGraphic = CanvasGraphic;
}, '@VERSION@' ,{skinnable:false, requires:['graphics']});