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Support for multiple thresholds #21

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Support for multiple thresholds #21

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103 changes: 81 additions & 22 deletions src/scripts/chartist-plugin-threshold.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,93 +8,152 @@

var defaultOptions = {
threshold: 0,
maskPadding: 10,
prefix: 'ct-threshold-',
classNames: {
aboveThreshold: 'ct-threshold-above',
belowThreshold: 'ct-threshold-below'
aboveThreshold: 'above',
prefixThreshold: 'area-',
belowThreshold: 'below'
},
maskNames: {
aboveThreshold: 'ct-threshold-mask-above',
belowThreshold: 'ct-threshold-mask-below'
aboveThreshold: 'mask-above',
prefixThreshold: 'mask-area-',
belowThreshold: 'mask-below'
}
};

function createMasks(data, options) {
// Select the defs element within the chart or create a new one
var defs = data.svg.querySelector('defs') || data.svg.elem('defs');
// Project the threshold value on the chart Y axis
var projectedThreshold = data.chartRect.height() - data.axisY.projectValue(options.threshold) + data.chartRect.y2;
var thresholds = options.thresholds;
// Convert threshold values to projected values
function projectedThreshold(threshold) {
return data.chartRect.height() - data.axisY.projectValue(threshold) + data.chartRect.y2;
}
var width = data.svg.width();
var height = data.svg.height();

var aboveThresholdValue = projectedThreshold(thresholds[0]);
var belowThresholdValue = projectedThreshold(thresholds[thresholds.length - 1]);

// Create mask for upper part above threshold
defs
.elem('mask', {
x: 0,
y: 0,
y: -1 * options.maskPadding,
width: width,
height: height,
id: options.maskNames.aboveThreshold
height: height + options.maskPadding,
id: options.prefix + options.maskNames.aboveThreshold
})
.elem('rect', {
x: 0,
y: 0,
y: -1 * options.maskPadding,
width: width,
height: projectedThreshold,
height: aboveThresholdValue + options.maskPadding,
fill: 'white'
});

// Create mask for lower part below threshold
defs
.elem('mask', {
x: 0,
y: 0,
y: -1 * options.maskPadding,
width: width,
height: height,
id: options.maskNames.belowThreshold
height: height + options.maskPadding,
id: options.prefix + options.maskNames.belowThreshold
})
.elem('rect', {
x: 0,
y: projectedThreshold,
y: belowThresholdValue,
width: width,
height: height - projectedThreshold,
height: height - belowThresholdValue + options.maskPadding,
fill: 'white'
});

// Add all other thresholds
for(var i = 1; i <= thresholds.length - 1; ++i) {
var currThreshold = projectedThreshold(thresholds[i]);
var prevThreshold = projectedThreshold(thresholds[i - 1]);
defs
.elem('mask', {
x: 0,
y: 0,
width: width,
height: height,
id: options.prefix + options.maskNames.prefixThreshold + (i - 1)
})
.elem('rect', {
x: 0,
y: prevThreshold,
width: width,
height: currThreshold - prevThreshold,
fill: 'white'
});
}

return defs;
}

Chartist.plugins = Chartist.plugins || {};
Chartist.plugins.ctThreshold = function (options) {

options = Chartist.extend({}, defaultOptions, options);
// Single threshold should be converted
if (!options.thresholds) {
options.thresholds = [options.threshold];
}

return function ctThreshold(chart) {
if (chart instanceof Chartist.Line || chart instanceof Chartist.Bar) {
chart.on('draw', function (data) {
if (data.type === 'point') {
// For points we can just use the data value and compare against the threshold in order to determine
// the appropriate class
data.element.addClass(
data.value.y >= options.threshold ? options.classNames.aboveThreshold : options.classNames.belowThreshold
);

if (data.value.y >= options.thresholds[0]){
data.element.addClass(options.prefix + options.classNames.aboveThreshold);
} else if (data.value.y < options.thresholds[options.thresholds.length - 1]) {
data.element.addClass(options.prefix + options.classNames.belowThreshold);
// Multiple thresholds
} else {
for(var i = 1; i <= options.thresholds.length - 1; ++i) {
// if value is larger that threshold we are done
if (data.value.y >= options.thresholds[i]){
data.element.addClass(options.prefix + options.classNames.prefixThreshold + (i - 1));
break;
}
}
}
} else if (data.type === 'line' || data.type === 'bar' || data.type === 'area') {
// Cloning the original line path, mask it with the upper mask rect above the threshold and add the
// class for above threshold
data.element
.parent()
.elem(data.element._node.cloneNode(true))
.attr({
mask: 'url(#' + options.maskNames.aboveThreshold + ')'
mask: 'url(#' + options.prefix + options.maskNames.aboveThreshold + ')'
})
.addClass(options.classNames.aboveThreshold);
.addClass(options.prefix + options.classNames.aboveThreshold);

// Add class for other thresholds
for(var j = 1; j <= options.thresholds.length - 1; ++j) {
data.element
.parent()
.elem(data.element._node.cloneNode(true))
.attr({
mask: 'url(#' + options.prefix + options.maskNames.prefixThreshold + (j-1) + ')'
})
.addClass(options.prefix + options.classNames.prefixThreshold + (j-1));
}

// Use the original line path, mask it with the lower mask rect below the threshold and add the class
// for blow threshold
data.element
.attr({
mask: 'url(#' + options.maskNames.belowThreshold + ')'
mask: 'url(#' + options.prefix + options.maskNames.belowThreshold + ')'
})
.addClass(options.classNames.belowThreshold);
.addClass(options.prefix + options.classNames.belowThreshold);
}
});

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