503 lines
16 KiB
JavaScript
Executable File
503 lines
16 KiB
JavaScript
Executable File
/*!
|
|
* chartjs-plugin-zoom
|
|
* https://chartjs.org/
|
|
* Version: 0.4.5
|
|
*
|
|
* Copyright 2016 Evert Timberg
|
|
* Released under the MIT license
|
|
* https://github.com/chartjs/chartjs-plugin-zoom/blob/master/LICENSE.md
|
|
*/
|
|
(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
|
|
|
|
},{}],2:[function(require,module,exports){
|
|
/*jslint browser:true, devel:true, white:true, vars:true */
|
|
/*global require*/
|
|
|
|
// hammer JS for touch support
|
|
var Hammer = require('hammerjs');
|
|
Hammer = typeof(Hammer) === 'function' ? Hammer : window.Hammer;
|
|
|
|
// Get the chart variable
|
|
var Chart = require('chart.js');
|
|
Chart = typeof(Chart) === 'function' ? Chart : window.Chart;
|
|
var helpers = Chart.helpers;
|
|
|
|
// Take the zoom namespace of Chart
|
|
var zoomNS = Chart.Zoom = Chart.Zoom || {};
|
|
|
|
// Where we store functions to handle different scale types
|
|
var zoomFunctions = zoomNS.zoomFunctions = zoomNS.zoomFunctions || {};
|
|
var panFunctions = zoomNS.panFunctions = zoomNS.panFunctions || {};
|
|
|
|
// Default options if none are provided
|
|
var defaultOptions = zoomNS.defaults = {
|
|
pan: {
|
|
enabled: true,
|
|
mode: 'xy',
|
|
speed: 20,
|
|
threshold: 10,
|
|
},
|
|
zoom: {
|
|
enabled: true,
|
|
mode: 'xy',
|
|
sensitivity: 3,
|
|
}
|
|
};
|
|
|
|
function directionEnabled(mode, dir) {
|
|
if (mode === undefined) {
|
|
return true;
|
|
} else if (typeof mode === 'string') {
|
|
return mode.indexOf(dir) !== -1;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
function zoomIndexScale(scale, zoom, center, zoomOptions) {
|
|
var labels = scale.chart.data.labels;
|
|
var minIndex = scale.minIndex;
|
|
var lastLabelIndex = labels.length - 1;
|
|
var maxIndex = scale.maxIndex;
|
|
var sensitivity = zoomOptions.sensitivity;
|
|
var chartCenter = scale.isHorizontal() ? scale.left + (scale.width/2) : scale.top + (scale.height/2);
|
|
var centerPointer = scale.isHorizontal() ? center.x : center.y;
|
|
|
|
zoomNS.zoomCumulativeDelta = zoom > 1 ? zoomNS.zoomCumulativeDelta + 1 : zoomNS.zoomCumulativeDelta - 1;
|
|
|
|
if (Math.abs(zoomNS.zoomCumulativeDelta) > sensitivity){
|
|
if(zoomNS.zoomCumulativeDelta < 0){
|
|
if(centerPointer <= chartCenter){
|
|
if (minIndex <= 0){
|
|
maxIndex = Math.min(lastLabelIndex, maxIndex + 1);
|
|
} else{
|
|
minIndex = Math.max(0, minIndex - 1);
|
|
}
|
|
} else if(centerPointer > chartCenter){
|
|
if (maxIndex >= lastLabelIndex){
|
|
minIndex = Math.max(0, minIndex - 1);
|
|
} else{
|
|
maxIndex = Math.min(lastLabelIndex, maxIndex + 1);
|
|
}
|
|
}
|
|
zoomNS.zoomCumulativeDelta = 0;
|
|
}
|
|
else if(zoomNS.zoomCumulativeDelta > 0){
|
|
if(centerPointer <= chartCenter){
|
|
minIndex = minIndex < maxIndex ? minIndex = Math.min(maxIndex, minIndex + 1) : minIndex;
|
|
} else if(centerPointer > chartCenter){
|
|
maxIndex = maxIndex > minIndex ? maxIndex = Math.max(minIndex, maxIndex - 1) : maxIndex;
|
|
}
|
|
zoomNS.zoomCumulativeDelta = 0;
|
|
}
|
|
scale.options.ticks.min = labels[minIndex];
|
|
scale.options.ticks.max = labels[maxIndex];
|
|
}
|
|
}
|
|
|
|
function zoomTimeScale(scale, zoom, center) {
|
|
var options = scale.options;
|
|
|
|
var range;
|
|
var min_percent;
|
|
if (scale.isHorizontal()) {
|
|
range = scale.right - scale.left;
|
|
min_percent = (center.x - scale.left) / range;
|
|
} else {
|
|
range = scale.bottom - scale.top;
|
|
min_percent = (center.y - scale.top) / range;
|
|
}
|
|
|
|
var max_percent = 1 - min_percent;
|
|
var newDiff = range * (zoom - 1);
|
|
|
|
var minDelta = newDiff * min_percent;
|
|
var maxDelta = newDiff * max_percent;
|
|
|
|
options.time.min = scale.getValueForPixel(scale.getPixelForValue(scale.firstTick) + minDelta);
|
|
options.time.max = scale.getValueForPixel(scale.getPixelForValue(scale.lastTick) - maxDelta);
|
|
}
|
|
|
|
function zoomNumericalScale(scale, zoom, center) {
|
|
var range = scale.max - scale.min;
|
|
var newDiff = range * (zoom - 1);
|
|
|
|
var cursorPixel = scale.isHorizontal() ? center.x : center.y;
|
|
var min_percent = (scale.getValueForPixel(cursorPixel) - scale.min) / range;
|
|
var max_percent = 1 - min_percent;
|
|
|
|
var minDelta = newDiff * min_percent;
|
|
var maxDelta = newDiff * max_percent;
|
|
|
|
scale.options.ticks.min = scale.min + minDelta;
|
|
scale.options.ticks.max = scale.max - maxDelta;
|
|
}
|
|
|
|
function zoomScale(scale, zoom, center, zoomOptions) {
|
|
var fn = zoomFunctions[scale.options.type];
|
|
if (fn) {
|
|
fn(scale, zoom, center, zoomOptions);
|
|
}
|
|
}
|
|
|
|
function doZoom(chartInstance, zoom, center) {
|
|
var ca = chartInstance.chartArea;
|
|
if (!center) {
|
|
center = {
|
|
x: (ca.left + ca.right) / 2,
|
|
y: (ca.top + ca.bottom) / 2,
|
|
};
|
|
}
|
|
|
|
var zoomOptions = chartInstance.options.zoom;
|
|
|
|
if (zoomOptions && helpers.getValueOrDefault(zoomOptions.enabled, defaultOptions.zoom.enabled)) {
|
|
// Do the zoom here
|
|
var zoomMode = helpers.getValueOrDefault(chartInstance.options.zoom.mode, defaultOptions.zoom.mode);
|
|
zoomOptions.sensitivity = helpers.getValueOrDefault(chartInstance.options.zoom.sensitivity, defaultOptions.zoom.sensitivity);
|
|
|
|
helpers.each(chartInstance.scales, function(scale, id) {
|
|
if (scale.isHorizontal() && directionEnabled(zoomMode, 'x')) {
|
|
zoomScale(scale, zoom, center, zoomOptions);
|
|
} else if (!scale.isHorizontal() && directionEnabled(zoomMode, 'y')) {
|
|
// Do Y zoom
|
|
zoomScale(scale, zoom, center, zoomOptions);
|
|
}
|
|
});
|
|
|
|
chartInstance.update(0);
|
|
}
|
|
}
|
|
|
|
function panIndexScale(scale, delta, panOptions) {
|
|
var labels = scale.chart.data.labels;
|
|
var lastLabelIndex = labels.length - 1;
|
|
var offsetAmt = Math.max((scale.ticks.length - ((scale.options.gridLines.offsetGridLines) ? 0 : 1)), 1);
|
|
var panSpeed = panOptions.speed;
|
|
var minIndex = scale.minIndex;
|
|
var step = Math.round(scale.width / (offsetAmt * panSpeed));
|
|
var maxIndex;
|
|
|
|
zoomNS.panCumulativeDelta += delta;
|
|
|
|
minIndex = zoomNS.panCumulativeDelta > step ? Math.max(0, minIndex -1) : zoomNS.panCumulativeDelta < -step ? Math.min(lastLabelIndex - offsetAmt + 1, minIndex + 1) : minIndex;
|
|
zoomNS.panCumulativeDelta = minIndex !== scale.minIndex ? 0 : zoomNS.panCumulativeDelta;
|
|
|
|
maxIndex = Math.min(lastLabelIndex, minIndex + offsetAmt - 1);
|
|
|
|
scale.options.ticks.min = labels[minIndex];
|
|
scale.options.ticks.max = labels[maxIndex];
|
|
}
|
|
|
|
function panTimeScale(scale, delta) {
|
|
var options = scale.options;
|
|
options.time.min = scale.getValueForPixel(scale.getPixelForValue(scale.firstTick) - delta);
|
|
options.time.max = scale.getValueForPixel(scale.getPixelForValue(scale.lastTick) - delta);
|
|
}
|
|
|
|
function panNumericalScale(scale, delta) {
|
|
var tickOpts = scale.options.ticks;
|
|
var start = scale.start,
|
|
end = scale.end;
|
|
|
|
if (tickOpts.reverse) {
|
|
tickOpts.max = scale.getValueForPixel(scale.getPixelForValue(start) - delta);
|
|
tickOpts.min = scale.getValueForPixel(scale.getPixelForValue(end) - delta);
|
|
} else {
|
|
tickOpts.min = scale.getValueForPixel(scale.getPixelForValue(start) - delta);
|
|
tickOpts.max = scale.getValueForPixel(scale.getPixelForValue(end) - delta);
|
|
}
|
|
}
|
|
|
|
function panScale(scale, delta, panOptions) {
|
|
var fn = panFunctions[scale.options.type];
|
|
if (fn) {
|
|
fn(scale, delta, panOptions);
|
|
}
|
|
}
|
|
|
|
function doPan(chartInstance, deltaX, deltaY) {
|
|
var panOptions = chartInstance.options.pan;
|
|
if (panOptions && helpers.getValueOrDefault(panOptions.enabled, defaultOptions.pan.enabled)) {
|
|
var panMode = helpers.getValueOrDefault(chartInstance.options.pan.mode, defaultOptions.pan.mode);
|
|
panOptions.speed = helpers.getValueOrDefault(chartInstance.options.pan.speed, defaultOptions.pan.speed);
|
|
|
|
helpers.each(chartInstance.scales, function(scale, id) {
|
|
if (scale.isHorizontal() && directionEnabled(panMode, 'x') && deltaX !== 0) {
|
|
panScale(scale, deltaX, panOptions);
|
|
} else if (!scale.isHorizontal() && directionEnabled(panMode, 'y') && deltaY !== 0) {
|
|
panScale(scale, deltaY, panOptions);
|
|
}
|
|
});
|
|
|
|
chartInstance.update(0);
|
|
}
|
|
}
|
|
|
|
function positionInChartArea(chartInstance, position) {
|
|
return (position.x >= chartInstance.chartArea.left && position.x <= chartInstance.chartArea.right) &&
|
|
(position.y >= chartInstance.chartArea.top && position.y <= chartInstance.chartArea.bottom);
|
|
}
|
|
|
|
function getYAxis(chartInstance) {
|
|
var scales = chartInstance.scales;
|
|
|
|
for (var scaleId in scales) {
|
|
var scale = scales[scaleId];
|
|
|
|
if (!scale.isHorizontal()) {
|
|
return scale;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Store these for later
|
|
zoomNS.zoomFunctions.category = zoomIndexScale;
|
|
zoomNS.zoomFunctions.time = zoomTimeScale;
|
|
zoomNS.zoomFunctions.linear = zoomNumericalScale;
|
|
zoomNS.zoomFunctions.logarithmic = zoomNumericalScale;
|
|
zoomNS.panFunctions.category = panIndexScale;
|
|
zoomNS.panFunctions.time = panTimeScale;
|
|
zoomNS.panFunctions.linear = panNumericalScale;
|
|
zoomNS.panFunctions.logarithmic = panNumericalScale;
|
|
// Globals for catergory pan and zoom
|
|
zoomNS.panCumulativeDelta = 0;
|
|
zoomNS.zoomCumulativeDelta = 0;
|
|
|
|
// Chartjs Zoom Plugin
|
|
var zoomPlugin = {
|
|
afterInit: function(chartInstance) {
|
|
helpers.each(chartInstance.scales, function(scale) {
|
|
scale.originalOptions = JSON.parse(JSON.stringify(scale.options));
|
|
});
|
|
|
|
chartInstance.resetZoom = function() {
|
|
helpers.each(chartInstance.scales, function(scale, id) {
|
|
var timeOptions = scale.options.time;
|
|
var tickOptions = scale.options.ticks;
|
|
|
|
if (timeOptions) {
|
|
delete timeOptions.min;
|
|
delete timeOptions.max;
|
|
}
|
|
|
|
if (tickOptions) {
|
|
delete tickOptions.min;
|
|
delete tickOptions.max;
|
|
}
|
|
|
|
scale.options = helpers.configMerge(scale.options, scale.originalOptions);
|
|
});
|
|
|
|
helpers.each(chartInstance.data.datasets, function(dataset, id) {
|
|
dataset._meta = null;
|
|
});
|
|
|
|
chartInstance.update();
|
|
};
|
|
|
|
},
|
|
beforeInit: function(chartInstance) {
|
|
chartInstance.zoom = {};
|
|
|
|
var node = chartInstance.zoom.node = chartInstance.chart.ctx.canvas;
|
|
|
|
var options = chartInstance.options;
|
|
var panThreshold = helpers.getValueOrDefault(options.pan ? options.pan.threshold : undefined, zoomNS.defaults.pan.threshold);
|
|
|
|
if (options.zoom && options.zoom.drag) {
|
|
// Only want to zoom horizontal axis
|
|
options.zoom.mode = 'x';
|
|
|
|
chartInstance.zoom._mouseDownHandler = function(event) {
|
|
chartInstance.zoom._dragZoomStart = event;
|
|
};
|
|
node.addEventListener('mousedown', chartInstance.zoom._mouseDownHandler);
|
|
|
|
chartInstance.zoom._mouseMoveHandler = function(event){
|
|
if (chartInstance.zoom._dragZoomStart) {
|
|
chartInstance.zoom._dragZoomEnd = event;
|
|
chartInstance.update(0);
|
|
}
|
|
|
|
chartInstance.update(0);
|
|
};
|
|
node.addEventListener('mousemove', chartInstance.zoom._mouseMoveHandler);
|
|
|
|
chartInstance.zoom._mouseUpHandler = function(event){
|
|
if (chartInstance.zoom._dragZoomStart) {
|
|
var chartArea = chartInstance.chartArea;
|
|
var yAxis = getYAxis(chartInstance);
|
|
var beginPoint = chartInstance.zoom._dragZoomStart;
|
|
var offsetX = beginPoint.target.getBoundingClientRect().left;
|
|
var startX = Math.min(beginPoint.clientX, event.clientX) - offsetX;
|
|
var endX = Math.max(beginPoint.clientX, event.clientX) - offsetX;
|
|
var dragDistance = endX - startX;
|
|
var chartDistance = chartArea.right - chartArea.left;
|
|
var zoom = 1 + ((chartDistance - dragDistance) / chartDistance );
|
|
|
|
if (dragDistance > 0) {
|
|
doZoom(chartInstance, zoom, {
|
|
x: (dragDistance / 2) + startX,
|
|
y: (yAxis.bottom - yAxis.top) / 2,
|
|
});
|
|
}
|
|
|
|
chartInstance.zoom._dragZoomStart = null;
|
|
chartInstance.zoom._dragZoomEnd = null;
|
|
}
|
|
};
|
|
node.addEventListener('mouseup', chartInstance.zoom._mouseUpHandler);
|
|
} else {
|
|
chartInstance.zoom._wheelHandler = function(event) {
|
|
var rect = event.target.getBoundingClientRect();
|
|
var offsetX = event.clientX - rect.left;
|
|
var offsetY = event.clientY - rect.top;
|
|
|
|
var center = {
|
|
x : offsetX,
|
|
y : offsetY
|
|
};
|
|
|
|
if (event.deltaY < 0) {
|
|
doZoom(chartInstance, 1.1, center);
|
|
} else {
|
|
doZoom(chartInstance, 0.909, center);
|
|
}
|
|
// Prevent the event from triggering the default behavior (eg. Content scrolling).
|
|
event.preventDefault();
|
|
};
|
|
|
|
node.addEventListener('wheel', chartInstance.zoom._wheelHandler);
|
|
}
|
|
|
|
if (Hammer) {
|
|
var mc = new Hammer.Manager(node);
|
|
mc.add(new Hammer.Pinch());
|
|
mc.add(new Hammer.Pan({
|
|
threshold: panThreshold
|
|
}));
|
|
|
|
// Hammer reports the total scaling. We need the incremental amount
|
|
var currentPinchScaling;
|
|
var handlePinch = function handlePinch(e) {
|
|
var diff = 1 / (currentPinchScaling) * e.scale;
|
|
doZoom(chartInstance, diff, e.center);
|
|
|
|
// Keep track of overall scale
|
|
currentPinchScaling = e.scale;
|
|
};
|
|
|
|
mc.on('pinchstart', function(e) {
|
|
currentPinchScaling = 1; // reset tracker
|
|
});
|
|
mc.on('pinch', handlePinch);
|
|
mc.on('pinchend', function(e) {
|
|
handlePinch(e);
|
|
currentPinchScaling = null; // reset
|
|
zoomNS.zoomCumulativeDelta = 0;
|
|
});
|
|
|
|
var currentDeltaX = null, currentDeltaY = null, panning = false;
|
|
var handlePan = function handlePan(e) {
|
|
if (currentDeltaX !== null && currentDeltaY !== null) {
|
|
panning = true;
|
|
var deltaX = e.deltaX - currentDeltaX;
|
|
var deltaY = e.deltaY - currentDeltaY;
|
|
currentDeltaX = e.deltaX;
|
|
currentDeltaY = e.deltaY;
|
|
doPan(chartInstance, deltaX, deltaY);
|
|
}
|
|
};
|
|
|
|
mc.on('panstart', function(e) {
|
|
currentDeltaX = 0;
|
|
currentDeltaY = 0;
|
|
handlePan(e);
|
|
});
|
|
mc.on('panmove', handlePan);
|
|
mc.on('panend', function(e) {
|
|
currentDeltaX = null;
|
|
currentDeltaY = null;
|
|
zoomNS.panCumulativeDelta = 0;
|
|
setTimeout(function() { panning = false; }, 500);
|
|
});
|
|
|
|
chartInstance.zoom._ghostClickHandler = function(e) {
|
|
if (panning) {
|
|
e.stopImmediatePropagation();
|
|
e.preventDefault();
|
|
}
|
|
};
|
|
node.addEventListener('click', chartInstance.zoom._ghostClickHandler);
|
|
|
|
chartInstance._mc = mc;
|
|
}
|
|
},
|
|
|
|
beforeDatasetsDraw: function(chartInstance) {
|
|
var ctx = chartInstance.chart.ctx;
|
|
var chartArea = chartInstance.chartArea;
|
|
ctx.save();
|
|
ctx.beginPath();
|
|
|
|
if (chartInstance.zoom._dragZoomEnd) {
|
|
var yAxis = getYAxis(chartInstance);
|
|
var beginPoint = chartInstance.zoom._dragZoomStart;
|
|
var endPoint = chartInstance.zoom._dragZoomEnd;
|
|
var offsetX = beginPoint.target.getBoundingClientRect().left;
|
|
var startX = Math.min(beginPoint.clientX, endPoint.clientX) - offsetX;
|
|
var endX = Math.max(beginPoint.clientX, endPoint.clientX) - offsetX;
|
|
var rectWidth = endX - startX;
|
|
|
|
|
|
ctx.fillStyle = 'rgba(225,225,225,0.3)';
|
|
ctx.lineWidth = 5;
|
|
ctx.fillRect(startX, yAxis.top, rectWidth, yAxis.bottom - yAxis.top);
|
|
}
|
|
|
|
ctx.rect(chartArea.left, chartArea.top, chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
|
|
ctx.clip();
|
|
},
|
|
|
|
afterDatasetsDraw: function(chartInstance) {
|
|
chartInstance.chart.ctx.restore();
|
|
},
|
|
|
|
destroy: function(chartInstance) {
|
|
if (chartInstance.zoom) {
|
|
var options = chartInstance.options;
|
|
var node = chartInstance.zoom.node;
|
|
|
|
if (options.zoom && options.zoom.drag) {
|
|
node.removeEventListener('mousedown', chartInstance.zoom._mouseDownHandler);
|
|
node.removeEventListener('mousemove', chartInstance.zoom._mouseMoveHandler);
|
|
node.removeEventListener('mouseup', chartInstance.zoom._mouseUpHandler);
|
|
} else {
|
|
node.removeEventListener('wheel', chartInstance.zoom._wheelHandler);
|
|
}
|
|
|
|
if (Hammer) {
|
|
node.removeEventListener('click', chartInstance.zoom._ghostClickHandler);
|
|
}
|
|
|
|
delete chartInstance.zoom;
|
|
|
|
var mc = chartInstance._mc;
|
|
if (mc) {
|
|
mc.remove('pinchstart');
|
|
mc.remove('pinch');
|
|
mc.remove('pinchend');
|
|
mc.remove('panstart');
|
|
mc.remove('pan');
|
|
mc.remove('panend');
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
module.exports = zoomPlugin;
|
|
Chart.pluginService.register(zoomPlugin);
|
|
|
|
},{"chart.js":1,"hammerjs":1}]},{},[2]);
|