TopAxisLayout.js revision f99edfa53c6ad6f0caab146a750c4404fd898dc3
/**
* Contains algorithms for rendering a top axis.
*
* @module charts
* @class TopAxisLayout
* @constructor
*/
TopAxisLayout = function(){};
TopAxisLayout.prototype = {
/**
* Default margins for text fields.
*
* @private
* @method _getDefaultMargins
* @return Object
*/
_getDefaultMargins: function()
{
return {
top: 0,
left: 0,
right: 0,
bottom: 4
};
},
/**
* Sets the length of the tick on either side of the axis line.
*
* @method setTickOffsets
* @protected
*/
setTickOffsets: function()
{
var host = this,
majorTicks = host.get("styles").majorTicks,
tickLength = majorTicks.length,
halfTick = tickLength * 0.5,
display = majorTicks.display;
host.set("leftTickOffset", 0);
host.set("rightTickOffset", 0);
switch(display)
{
case "inside" :
host.set("bottomTickOffset", tickLength);
host.set("topTickOffset", 0);
break;
case "outside" :
host.set("bottomTickOffset", 0);
host.set("topTickOffset", tickLength);
break;
case "cross" :
host.set("topTickOffset", halfTick);
host.set("bottomTickOffset", halfTick);
break;
default:
host.set("topTickOffset", 0);
host.set("bottomTickOffset", 0);
break;
}
},
/**
* Calculates the coordinates for the first point on an axis.
*
* @method getLineStart
* @protected
*/
getLineStart: function()
{
var host = this,
style = host.get("styles"),
padding = style.padding,
majorTicks = style.majorTicks,
tickLength = majorTicks.length,
display = majorTicks.display,
pt = {x:0, y:padding.top};
if(display === "outside")
{
pt.y += tickLength;
}
else if(display === "cross")
{
pt.y += tickLength/2;
}
return pt;
},
/**
* Draws a tick
*
* @method drawTick
* @param {Path} path reference to the path `Path` element in which to draw the tick.
* @param {Object} pt hash containing x and y coordinates
* @param {Object} tickStyles hash of properties used to draw the tick
* @protected
*/
drawTick: function(path, pt, tickStyles)
{
var host = this,
style = host.get("styles"),
padding = style.padding,
tickLength = tickStyles.length,
start = {x:pt.x, y:padding.top},
end = {x:pt.x, y:tickLength + padding.top};
host.drawLine(path, start, end);
},
/**
* Calculates the point for a label.
*
* @method getLabelPoint
* @param {Object} pt hash containing x and y coordinates
* @return Object
* @protected
*/
getLabelPoint: function(pt)
{
return {x:pt.x, y:pt.y - this.get("topTickOffset")};
},
/**
* Updates the value for the `maxLabelSize` for use in calculating total size.
*
* @method updateMaxLabelSize
* @param {HTMLElement} label to measure
* @protected
*/
updateMaxLabelSize: function(label)
{
var host = this,
props = this._labelRotationProps,
rot = props.rot,
absRot = props.absRot,
sinRadians = props.sinRadians,
cosRadians = props.cosRadians,
m11 = props.m11,
m12 = props.m12,
m21 = props.m21,
m22 = props.m22,
max;
if(!DOCUMENT.createElementNS)
{
label.style.filter = 'progid:DXImageTransform.Microsoft.Matrix(M11=' + m11 + ' M12=' + m12 + ' M21=' + m21 + ' M22=' + m22 + ' sizingMethod="auto expand")';
host.set("maxLabelSize", Math.max(host.get("maxLabelSize"), label.offsetHeight));
}
else
{
label.style.msTransform = "rotate(0deg)";
if(rot === 0)
{
max = label.offsetHeight;
}
else if(absRot === 90)
{
max = label.offsetWidth;
}
else
{
max = (sinRadians * label.offsetWidth) + (cosRadians * label.offsetHeight);
}
host.set("maxLabelSize", Math.max(host.get("maxLabelSize"), max));
}
},
/**
* Rotate and position title.
*
* @method positionTitle
* @param {HTMLElement} label to rotate position
* @protected
*/
positionTitle: function(label)
{
var host = this,
max,
styles = host.get("styles").title,
props = this._getTextRotationProps(styles),
rot = props.rot,
absRot = props.absRot,
sinRadians = props.sinRadians,
cosRadians = props.cosRadians,
x = this.get("width")/2,
y = styles.margin.top,
leftOffset = 0,
topOffset = 0,
labelWidth = label.offsetWidth,
labelHeight = label.offsetHeight;
if(Y.config.doc.createElementNS)
{
if(rot === 0)
{
max = labelHeight;
leftOffset -= labelWidth * 0.5;
}
else if(absRot === 90)
{
max = labelWidth;
if(rot === 90)
{
leftOffset += labelHeight/2;
}
else
{
topOffset += labelWidth;
leftOffset -= labelHeight/2;
}
}
else
{
max = (sinRadians * labelWidth) + (cosRadians * labelHeight);
if(rot > 0)
{
leftOffset -= (cosRadians * labelWidth)/2 - (sinRadians * labelHeight)/2;
}
else
{
topOffset += (sinRadians * labelWidth);
leftOffset -= (cosRadians * labelWidth)/2 + (sinRadians * labelHeight)/2;
}
}
x += leftOffset;
y += topOffset;
props.x = Math.round(x);
props.y = Math.round(y);
}
else
{
label.style.filter = null;
labelWidth = Math.round(label.offsetWidth);
labelHeight = Math.round(label.offsetHeight);
if(rot === 0)
{
leftOffset -= labelWidth * 0.5;
max = labelHeight;
}
else if(rot === 90)
{
leftOffset -= labelHeight * 0.5;
max = labelWidth;
}
else if(rot === -90)
{
leftOffset -= labelHeight * 0.5;
max = labelWidth;
}
else
{
max = (sinRadians * labelWidth) + (cosRadians * labelHeight);
leftOffset -= ((cosRadians * labelWidth) + (sinRadians * labelHeight))/2;
}
x += leftOffset;
y += topOffset;
label.style.left = Math.round(x) + "px";
label.style.top = Math.round(y) + "px";
}
this._titleSize = max;
this._rotate(label, props);
},
/**
* Rotate and position labels.
*
* @method positionLabel
* @param {HTMLElement} label to rotate position
* @param {Object} pt hash containing the x and y coordinates in which the label will be positioned
* against.
* @protected
*/
positionLabel: function(label, pt)
{
var host = this,
tickOffset = host.get("topTickOffset"),
bottomTickOffset = host.get("bottomTickOffset"),
style = host.get("styles").label,
titleStyles = host.get("styles").title,
totalTitleSize = this.get("title") ? this._titleSize + titleStyles.margin.top + titleStyles.margin.bottom : 0,
margin = 0,
leftOffset = pt.x,
topOffset = pt.y + totalTitleSize,
props = this._labelRotationProps,
rot = props.rot,
absRot = props.absRot,
sinRadians = props.sinRadians,
cosRadians = props.cosRadians,
maxLabelSize = host.get("maxLabelSize"),
labelWidth = Math.round(label.offsetWidth),
labelHeight = Math.round(label.offsetHeight);
if(style.margin && style.margin.bottom)
{
margin = style.margin.bottom;
}
if(!DOCUMENT.createElementNS)
{
label.style.filter = null;
labelWidth = Math.round(label.offsetWidth);
labelHeight = Math.round(label.offsetHeight);
if(rot === 0)
{
leftOffset -= labelWidth * 0.5;
}
else if(absRot === 90)
{
leftOffset -= labelHeight * 0.5;
}
else if(rot > 0)
{
leftOffset -= (cosRadians * labelWidth) + Math.min((sinRadians * labelHeight), (rot/180 * labelHeight));
topOffset -= (sinRadians * labelWidth) + (cosRadians * (labelHeight));
topOffset += maxLabelSize;
}
else
{
leftOffset -= sinRadians * (labelHeight * 0.5);
topOffset -= (sinRadians * labelWidth) + (cosRadians * (labelHeight));
topOffset += maxLabelSize;
}
topOffset -= tickOffset;
label.style.left = Math.round(leftOffset);
label.style.top = Math.round(topOffset);
this._rotate(label, props);
return;
}
label.style.msTransform = "rotate(0deg)";
labelWidth = Math.round(label.offsetWidth);
labelHeight = Math.round(label.offsetHeight);
if(rot === 0)
{
leftOffset -= labelWidth * 0.5;
topOffset -= labelHeight;
}
else if(rot === 90)
{
leftOffset += labelHeight * 0.5;
topOffset -= labelWidth;
}
else if(rot === -90)
{
leftOffset -= labelHeight * 0.5;
topOffset -= 0;
}
else if(rot < 0)
{
leftOffset -= (sinRadians * (labelHeight * 0.6));
topOffset -= (cosRadians * labelHeight);
}
else
{
leftOffset -= (cosRadians * labelWidth) - (sinRadians * (labelHeight * 0.6));
topOffset -= (sinRadians * labelWidth) + (cosRadians * labelHeight);
}
topOffset += bottomTickOffset;
topOffset -= margin;
props.x = Math.round(leftOffset);
props.y = Math.round(host.get("maxLabelSize") + topOffset);
this._rotate(label, props);
},
/**
* Calculates the size and positions the content elements.
*
* @method setSizeAndPosition
* @protected
*/
setSizeAndPosition: function()
{
var host = this,
labelSize = host.get("maxLabelSize"),
tickOffset = host.get("topTickOffset"),
style = host.get("styles"),
margin = style.label.margin,
graphic = host.get("graphic"),
sz = tickOffset + labelSize,
titleMargin = style.title.margin;
if(margin && margin.bottom)
{
sz += margin.bottom;
}
if(this.get("title"))
{
sz += this._titleSize + titleMargin.top + titleMargin.bottom;
}
host.set("height", sz);
graphic.set("y", sz - tickOffset);
},
/**
* Adjusts position for inner ticks.
*
* @method offsetNodeForTick
* @param {Node} cb contentBox of the axis
* @protected
*/
offsetNodeForTick: function(cb)
{
},
/**
* Assigns a height based on the size of the contents.
*
* @method setCalculatedSize
* @protected
*/
setCalculatedSize: function()
{
var host = this,
graphic = host.get("graphic"),
styles = host.get("styles"),
labelMargin = styles.label.margin,
titleMargin = styles.title.margin,
totalLabelSize = labelMargin.top + labelMargin.bottom + host.get("maxLabelSize"),
totalTitleSize = host.get("title") ? titleMargin.top + titleMargin.bottom + host._titleSize : 0,
topTickOffset = this.get("topTickOffset"),
ttl = Math.round(topTickOffset + totalLabelSize + totalTitleSize);
host.set("height", ttl);
graphic.set("y", ttl - topTickOffset);
}
};
Y.TopAxisLayout = TopAxisLayout;