zettapi_client
Version:
Client side CRUD operations in angular to use with zettapi_server rest api to get started quickly in any CMS project
415 lines (356 loc) • 14.8 kB
JavaScript
'use strict';
module.exports = function(Chart) {
var helpers = Chart.helpers;
var globalDefaults = Chart.defaults.global;
var defaultConfig = {
display: true,
// Boolean - Whether to animate scaling the chart from the centre
animate: true,
lineArc: false,
position: 'chartArea',
angleLines: {
display: true,
color: 'rgba(0, 0, 0, 0.1)',
lineWidth: 1
},
// label settings
ticks: {
// Boolean - Show a backdrop to the scale label
showLabelBackdrop: true,
// String - The colour of the label backdrop
backdropColor: 'rgba(255,255,255,0.75)',
// Number - The backdrop padding above & below the label in pixels
backdropPaddingY: 2,
// Number - The backdrop padding to the side of the label in pixels
backdropPaddingX: 2
},
pointLabels: {
// Number - Point label font size in pixels
fontSize: 10,
// Function - Used to convert point labels
callback: function(label) {
return label;
}
}
};
var LinearRadialScale = Chart.LinearScaleBase.extend({
getValueCount: function() {
return this.chart.data.labels.length;
},
setDimensions: function() {
var me = this;
var opts = me.options;
var tickOpts = opts.ticks;
// Set the unconstrained dimension before label rotation
me.width = me.maxWidth;
me.height = me.maxHeight;
me.xCenter = Math.round(me.width / 2);
me.yCenter = Math.round(me.height / 2);
var minSize = helpers.min([me.height, me.width]);
var tickFontSize = helpers.getValueOrDefault(tickOpts.fontSize, globalDefaults.defaultFontSize);
me.drawingArea = opts.display ? (minSize / 2) - (tickFontSize / 2 + tickOpts.backdropPaddingY) : (minSize / 2);
},
determineDataLimits: function() {
var me = this;
var chart = me.chart;
me.min = null;
me.max = null;
helpers.each(chart.data.datasets, function(dataset, datasetIndex) {
if (chart.isDatasetVisible(datasetIndex)) {
var meta = chart.getDatasetMeta(datasetIndex);
helpers.each(dataset.data, function(rawValue, index) {
var value = +me.getRightValue(rawValue);
if (isNaN(value) || meta.data[index].hidden) {
return;
}
if (me.min === null) {
me.min = value;
} else if (value < me.min) {
me.min = value;
}
if (me.max === null) {
me.max = value;
} else if (value > me.max) {
me.max = value;
}
});
}
});
// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
me.handleTickRangeOptions();
},
getTickLimit: function() {
var tickOpts = this.options.ticks;
var tickFontSize = helpers.getValueOrDefault(tickOpts.fontSize, globalDefaults.defaultFontSize);
return Math.min(tickOpts.maxTicksLimit ? tickOpts.maxTicksLimit : 11, Math.ceil(this.drawingArea / (1.5 * tickFontSize)));
},
convertTicksToLabels: function() {
var me = this;
Chart.LinearScaleBase.prototype.convertTicksToLabels.call(me);
// Point labels
me.pointLabels = me.chart.data.labels.map(me.options.pointLabels.callback, me);
},
getLabelForIndex: function(index, datasetIndex) {
return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
},
fit: function() {
/*
* Right, this is really confusing and there is a lot of maths going on here
* The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
*
* Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
*
* Solution:
*
* We assume the radius of the polygon is half the size of the canvas at first
* at each index we check if the text overlaps.
*
* Where it does, we store that angle and that index.
*
* After finding the largest index and angle we calculate how much we need to remove
* from the shape radius to move the point inwards by that x.
*
* We average the left and right distances to get the maximum shape radius that can fit in the box
* along with labels.
*
* Once we have that, we can find the centre point for the chart, by taking the x text protrusion
* on each side, removing that from the size, halving it and adding the left x protrusion width.
*
* This will mean we have a shape fitted to the canvas, as large as it can be with the labels
* and position it in the most space efficient manner
*
* https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
*/
var pointLabels = this.options.pointLabels;
var pointLabelFontSize = helpers.getValueOrDefault(pointLabels.fontSize, globalDefaults.defaultFontSize);
var pointLabeFontStyle = helpers.getValueOrDefault(pointLabels.fontStyle, globalDefaults.defaultFontStyle);
var pointLabeFontFamily = helpers.getValueOrDefault(pointLabels.fontFamily, globalDefaults.defaultFontFamily);
var pointLabeFont = helpers.fontString(pointLabelFontSize, pointLabeFontStyle, pointLabeFontFamily);
// Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
// Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
var largestPossibleRadius = helpers.min([(this.height / 2 - pointLabelFontSize - 5), this.width / 2]),
pointPosition,
i,
textWidth,
halfTextWidth,
furthestRight = this.width,
furthestRightIndex,
furthestRightAngle,
furthestLeft = 0,
furthestLeftIndex,
furthestLeftAngle,
xProtrusionLeft,
xProtrusionRight,
radiusReductionRight,
radiusReductionLeft;
this.ctx.font = pointLabeFont;
for (i = 0; i < this.getValueCount(); i++) {
// 5px to space the text slightly out - similar to what we do in the draw function.
pointPosition = this.getPointPosition(i, largestPossibleRadius);
textWidth = this.ctx.measureText(this.pointLabels[i] ? this.pointLabels[i] : '').width + 5;
// Add quarter circle to make degree 0 mean top of circle
var angleRadians = this.getIndexAngle(i) + (Math.PI / 2);
var angle = (angleRadians * 360 / (2 * Math.PI)) % 360;
if (angle === 0 || angle === 180) {
// At angle 0 and 180, we're at exactly the top/bottom
// of the radar chart, so text will be aligned centrally, so we'll half it and compare
// w/left and right text sizes
halfTextWidth = textWidth / 2;
if (pointPosition.x + halfTextWidth > furthestRight) {
furthestRight = pointPosition.x + halfTextWidth;
furthestRightIndex = i;
}
if (pointPosition.x - halfTextWidth < furthestLeft) {
furthestLeft = pointPosition.x - halfTextWidth;
furthestLeftIndex = i;
}
} else if (angle < 180) {
// Less than half the values means we'll left align the text
if (pointPosition.x + textWidth > furthestRight) {
furthestRight = pointPosition.x + textWidth;
furthestRightIndex = i;
}
// More than half the values means we'll right align the text
} else if (pointPosition.x - textWidth < furthestLeft) {
furthestLeft = pointPosition.x - textWidth;
furthestLeftIndex = i;
}
}
xProtrusionLeft = furthestLeft;
xProtrusionRight = Math.ceil(furthestRight - this.width);
furthestRightAngle = this.getIndexAngle(furthestRightIndex);
furthestLeftAngle = this.getIndexAngle(furthestLeftIndex);
radiusReductionRight = xProtrusionRight / Math.sin(furthestRightAngle + Math.PI / 2);
radiusReductionLeft = xProtrusionLeft / Math.sin(furthestLeftAngle + Math.PI / 2);
// Ensure we actually need to reduce the size of the chart
radiusReductionRight = (helpers.isNumber(radiusReductionRight)) ? radiusReductionRight : 0;
radiusReductionLeft = (helpers.isNumber(radiusReductionLeft)) ? radiusReductionLeft : 0;
this.drawingArea = Math.round(largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2);
this.setCenterPoint(radiusReductionLeft, radiusReductionRight);
},
setCenterPoint: function(leftMovement, rightMovement) {
var me = this;
var maxRight = me.width - rightMovement - me.drawingArea,
maxLeft = leftMovement + me.drawingArea;
me.xCenter = Math.round(((maxLeft + maxRight) / 2) + me.left);
// Always vertically in the centre as the text height doesn't change
me.yCenter = Math.round((me.height / 2) + me.top);
},
getIndexAngle: function(index) {
var angleMultiplier = (Math.PI * 2) / this.getValueCount();
var startAngle = this.chart.options && this.chart.options.startAngle ?
this.chart.options.startAngle :
0;
var startAngleRadians = startAngle * Math.PI * 2 / 360;
// Start from the top instead of right, so remove a quarter of the circle
return index * angleMultiplier - (Math.PI / 2) + startAngleRadians;
},
getDistanceFromCenterForValue: function(value) {
var me = this;
if (value === null) {
return 0; // null always in center
}
// Take into account half font size + the yPadding of the top value
var scalingFactor = me.drawingArea / (me.max - me.min);
if (me.options.reverse) {
return (me.max - value) * scalingFactor;
}
return (value - me.min) * scalingFactor;
},
getPointPosition: function(index, distanceFromCenter) {
var me = this;
var thisAngle = me.getIndexAngle(index);
return {
x: Math.round(Math.cos(thisAngle) * distanceFromCenter) + me.xCenter,
y: Math.round(Math.sin(thisAngle) * distanceFromCenter) + me.yCenter
};
},
getPointPositionForValue: function(index, value) {
return this.getPointPosition(index, this.getDistanceFromCenterForValue(value));
},
getBasePosition: function() {
var me = this;
var min = me.min;
var max = me.max;
return me.getPointPositionForValue(0,
me.beginAtZero? 0:
min < 0 && max < 0? max :
min > 0 && max > 0? min :
0);
},
draw: function() {
var me = this;
var opts = me.options;
var gridLineOpts = opts.gridLines;
var tickOpts = opts.ticks;
var angleLineOpts = opts.angleLines;
var pointLabelOpts = opts.pointLabels;
var getValueOrDefault = helpers.getValueOrDefault;
if (opts.display) {
var ctx = me.ctx;
// Tick Font
var tickFontSize = getValueOrDefault(tickOpts.fontSize, globalDefaults.defaultFontSize);
var tickFontStyle = getValueOrDefault(tickOpts.fontStyle, globalDefaults.defaultFontStyle);
var tickFontFamily = getValueOrDefault(tickOpts.fontFamily, globalDefaults.defaultFontFamily);
var tickLabelFont = helpers.fontString(tickFontSize, tickFontStyle, tickFontFamily);
helpers.each(me.ticks, function(label, index) {
// Don't draw a centre value (if it is minimum)
if (index > 0 || opts.reverse) {
var yCenterOffset = me.getDistanceFromCenterForValue(me.ticksAsNumbers[index]);
var yHeight = me.yCenter - yCenterOffset;
// Draw circular lines around the scale
if (gridLineOpts.display && index !== 0) {
ctx.strokeStyle = helpers.getValueAtIndexOrDefault(gridLineOpts.color, index - 1);
ctx.lineWidth = helpers.getValueAtIndexOrDefault(gridLineOpts.lineWidth, index - 1);
if (opts.lineArc) {
// Draw circular arcs between the points
ctx.beginPath();
ctx.arc(me.xCenter, me.yCenter, yCenterOffset, 0, Math.PI * 2);
ctx.closePath();
ctx.stroke();
} else {
// Draw straight lines connecting each index
ctx.beginPath();
for (var i = 0; i < me.getValueCount(); i++) {
var pointPosition = me.getPointPosition(i, yCenterOffset);
if (i === 0) {
ctx.moveTo(pointPosition.x, pointPosition.y);
} else {
ctx.lineTo(pointPosition.x, pointPosition.y);
}
}
ctx.closePath();
ctx.stroke();
}
}
if (tickOpts.display) {
var tickFontColor = getValueOrDefault(tickOpts.fontColor, globalDefaults.defaultFontColor);
ctx.font = tickLabelFont;
if (tickOpts.showLabelBackdrop) {
var labelWidth = ctx.measureText(label).width;
ctx.fillStyle = tickOpts.backdropColor;
ctx.fillRect(
me.xCenter - labelWidth / 2 - tickOpts.backdropPaddingX,
yHeight - tickFontSize / 2 - tickOpts.backdropPaddingY,
labelWidth + tickOpts.backdropPaddingX * 2,
tickFontSize + tickOpts.backdropPaddingY * 2
);
}
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';
ctx.fillStyle = tickFontColor;
ctx.fillText(label, me.xCenter, yHeight);
}
}
});
if (!opts.lineArc) {
ctx.lineWidth = angleLineOpts.lineWidth;
ctx.strokeStyle = angleLineOpts.color;
var outerDistance = me.getDistanceFromCenterForValue(opts.reverse ? me.min : me.max);
// Point Label Font
var pointLabelFontSize = getValueOrDefault(pointLabelOpts.fontSize, globalDefaults.defaultFontSize);
var pointLabeFontStyle = getValueOrDefault(pointLabelOpts.fontStyle, globalDefaults.defaultFontStyle);
var pointLabeFontFamily = getValueOrDefault(pointLabelOpts.fontFamily, globalDefaults.defaultFontFamily);
var pointLabeFont = helpers.fontString(pointLabelFontSize, pointLabeFontStyle, pointLabeFontFamily);
for (var i = me.getValueCount() - 1; i >= 0; i--) {
if (angleLineOpts.display) {
var outerPosition = me.getPointPosition(i, outerDistance);
ctx.beginPath();
ctx.moveTo(me.xCenter, me.yCenter);
ctx.lineTo(outerPosition.x, outerPosition.y);
ctx.stroke();
ctx.closePath();
}
// Extra 3px out for some label spacing
var pointLabelPosition = me.getPointPosition(i, outerDistance + 5);
// Keep this in loop since we may support array properties here
var pointLabelFontColor = getValueOrDefault(pointLabelOpts.fontColor, globalDefaults.defaultFontColor);
ctx.font = pointLabeFont;
ctx.fillStyle = pointLabelFontColor;
var pointLabels = me.pointLabels;
// Add quarter circle to make degree 0 mean top of circle
var angleRadians = this.getIndexAngle(i) + (Math.PI / 2);
var angle = (angleRadians * 360 / (2 * Math.PI)) % 360;
if (angle === 0 || angle === 180) {
ctx.textAlign = 'center';
} else if (angle < 180) {
ctx.textAlign = 'left';
} else {
ctx.textAlign = 'right';
}
// Set the correct text baseline based on outer positioning
if (angle === 90 || angle === 270) {
ctx.textBaseline = 'middle';
} else if (angle > 270 || angle < 90) {
ctx.textBaseline = 'bottom';
} else {
ctx.textBaseline = 'top';
}
ctx.fillText(pointLabels[i] ? pointLabels[i] : '', pointLabelPosition.x, pointLabelPosition.y);
}
}
}
}
});
Chart.scaleService.registerScaleType('radialLinear', LinearRadialScale, defaultConfig);
};