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import Chart from 'chart.js';
import Hammer from 'hammerjs';
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 || {};
Chart.Zoom.defaults = Chart.defaults.global.plugins.zoom = {
pan: {
enabled: false,
mode: 'xy',
speed: 20,
threshold: 10
},
zoom: {
enabled: false,
mode: 'xy',
sensitivity: 3,
speed: 0.1
}
};
function resolveOptions(chart, options) {
var deprecatedOptions = {};
Iif (typeof chart.options.pan !== 'undefined') {
deprecatedOptions.pan = chart.options.pan;
}
Iif (typeof chart.options.zoom !== 'undefined') {
deprecatedOptions.zoom = chart.options.zoom;
}
var props = chart.$zoom;
options = props._options = helpers.merge({}, [options, deprecatedOptions]);
// Install listeners. Do this dynamically based on options so that we can turn zoom on and off
// We also want to make sure listeners aren't always on. E.g. if you're scrolling down a page
// and the mouse goes over a chart you don't want it intercepted unless the plugin is enabled
var node = props._node;
var zoomEnabled = options.zoom && options.zoom.enabled;
var dragEnabled = options.zoom.drag;
Iif (zoomEnabled && !dragEnabled) {
node.addEventListener('wheel', props._wheelHandler);
} else {
node.removeEventListener('wheel', props._wheelHandler);
}
if (zoomEnabled && dragEnabled) {
node.addEventListener('mousedown', props._mouseDownHandler);
node.ownerDocument.addEventListener('mouseup', props._mouseUpHandler);
} else {
node.removeEventListener('mousedown', props._mouseDownHandler);
node.removeEventListener('mousemove', props._mouseMoveHandler);
node.ownerDocument.removeEventListener('mouseup', props._mouseUpHandler);
}
}
function storeOriginalOptions(chart) {
var originalOptions = chart.$zoom._originalOptions;
helpers.each(chart.scales, function(scale) {
Eif (!originalOptions[scale.id]) {
originalOptions[scale.id] = helpers.clone(scale.options);
}
});
helpers.each(originalOptions, function(opt, key) {
Iif (!chart.scales[key]) {
delete originalOptions[key];
}
});
}
/**
* @param {string} mode can be 'x', 'y' or 'xy'
* @param {string} dir can be 'x' or 'y'
* @param {Chart} chart instance of the chart in question
*/
function directionEnabled(mode, dir, chart) {
Iif (mode === undefined) {
return true;
} else if (typeof mode === 'string') {
return mode.indexOf(dir) !== -1;
} else Eif (typeof mode === 'function') {
return mode({chart: chart}).indexOf(dir) !== -1;
}
return false;
}
function rangeMaxLimiter(zoomPanOptions, newMax) {
Iif (zoomPanOptions.scaleAxes && zoomPanOptions.rangeMax &&
!helpers.isNullOrUndef(zoomPanOptions.rangeMax[zoomPanOptions.scaleAxes])) {
var rangeMax = zoomPanOptions.rangeMax[zoomPanOptions.scaleAxes];
if (newMax > rangeMax) {
newMax = rangeMax;
}
}
return newMax;
}
function rangeMinLimiter(zoomPanOptions, newMin) {
Iif (zoomPanOptions.scaleAxes && zoomPanOptions.rangeMin &&
!helpers.isNullOrUndef(zoomPanOptions.rangeMin[zoomPanOptions.scaleAxes])) {
var rangeMin = zoomPanOptions.rangeMin[zoomPanOptions.scaleAxes];
if (newMin < rangeMin) {
newMin = rangeMin;
}
}
return newMin;
}
function zoomCategoryScale(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 = rangeMinLimiter(zoomOptions, labels[minIndex]);
scale.options.ticks.max = rangeMaxLimiter(zoomOptions, labels[maxIndex]);
}
}
function zoomNumericalScale(scale, zoom, center, zoomOptions) {
var range = scale.max - scale.min;
var newDiff = range * (zoom - 1);
var centerPoint = scale.isHorizontal() ? center.x : center.y;
var minPercent = (scale.getValueForPixel(centerPoint) - scale.min) / range;
var maxPercent = 1 - minPercent;
var minDelta = newDiff * minPercent;
var maxDelta = newDiff * maxPercent;
scale.options.ticks.min = rangeMinLimiter(zoomOptions, scale.min + minDelta);
scale.options.ticks.max = rangeMaxLimiter(zoomOptions, scale.max - maxDelta);
}
function zoomTimeScale(scale, zoom, center, zoomOptions) {
zoomNumericalScale(scale, zoom, center, zoomOptions);
var options = scale.options;
if (options.time) {
if (options.time.min) {
options.time.min = options.ticks.min;
}
if (options.time.max) {
options.time.max = options.ticks.max;
}
}
}
function zoomScale(scale, zoom, center, zoomOptions) {
var fn = zoomFunctions[scale.type];
Eif (fn) {
fn(scale, zoom, center, zoomOptions);
}
}
/**
* @param chart The chart instance
* @param {number} percentZoomX The zoom percentage in the x direction
* @param {number} percentZoomY The zoom percentage in the y direction
* @param {{x: number, y: number}} focalPoint The x and y coordinates of zoom focal point. The point which doesn't change while zooming. E.g. the location of the mouse cursor when "drag: false"
* @param {string} whichAxes `xy`, 'x', or 'y'
* @param {number} animationDuration Duration of the animation of the redraw in milliseconds
*/
function doZoom(chart, percentZoomX, percentZoomY, focalPoint, whichAxes, animationDuration) {
var ca = chart.chartArea;
Iif (!focalPoint) {
focalPoint = {
x: (ca.left + ca.right) / 2,
y: (ca.top + ca.bottom) / 2,
};
}
var zoomOptions = chart.$zoom._options.zoom;
Eif (zoomOptions.enabled) {
storeOriginalOptions(chart);
// Do the zoom here
var zoomMode = typeof zoomOptions.mode === 'function' ? zoomOptions.mode({chart: chart}) : zoomOptions.mode;
// Which axe should be modified when figers were used.
var _whichAxes;
Iif (zoomMode === 'xy' && whichAxes !== undefined) {
// based on fingers positions
_whichAxes = whichAxes;
} else {
// no effect
_whichAxes = 'xy';
}
helpers.each(chart.scales, function(scale) {
if (scale.isHorizontal() && directionEnabled(zoomMode, 'x', chart) && directionEnabled(_whichAxes, 'x', chart)) {
zoomOptions.scaleAxes = 'x';
zoomScale(scale, percentZoomX, focalPoint, zoomOptions);
} else if (!scale.isHorizontal() && directionEnabled(zoomMode, 'y', chart) && directionEnabled(_whichAxes, 'y', chart)) {
// Do Y zoom
zoomOptions.scaleAxes = 'y';
zoomScale(scale, percentZoomY, focalPoint, zoomOptions);
}
});
Iif (animationDuration) {
chart.update({
duration: animationDuration,
easing: 'easeOutQuad',
});
} else {
chart.update(0);
}
Iif (typeof zoomOptions.onZoom === 'function') {
zoomOptions.onZoom({chart: chart});
}
}
}
function panCategoryScale(scale, delta, panOptions) {
var labels = scale.chart.data.labels;
var lastLabelIndex = labels.length - 1;
var offsetAmt = Math.max(scale.ticks.length, 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 = rangeMinLimiter(panOptions, labels[minIndex]);
scale.options.ticks.max = rangeMaxLimiter(panOptions, labels[maxIndex]);
}
function panNumericalScale(scale, delta, panOptions) {
var tickOpts = scale.options.ticks;
var prevStart = scale.min;
var prevEnd = scale.max;
var newMin = scale.getValueForPixel(scale.getPixelForValue(prevStart) - delta);
var newMax = scale.getValueForPixel(scale.getPixelForValue(prevEnd) - delta);
// The time scale returns date objects so convert to numbers. Can remove at Chart.js v3
newMin = newMin.valueOf ? newMin.valueOf() : newMin;
newMax = newMax.valueOf ? newMax.valueOf() : newMax;
var rangeMin = newMin;
var rangeMax = newMax;
var diff;
if (panOptions.scaleAxes && panOptions.rangeMin &&
!helpers.isNullOrUndef(panOptions.rangeMin[panOptions.scaleAxes])) {
rangeMin = panOptions.rangeMin[panOptions.scaleAxes];
}
if (panOptions.scaleAxes && panOptions.rangeMax &&
!helpers.isNullOrUndef(panOptions.rangeMax[panOptions.scaleAxes])) {
rangeMax = panOptions.rangeMax[panOptions.scaleAxes];
}
if (newMin >= rangeMin && newMax <= rangeMax) {
tickOpts.min = newMin;
tickOpts.max = newMax;
} else if (newMin < rangeMin) {
diff = prevStart - rangeMin;
tickOpts.min = rangeMin;
tickOpts.max = prevEnd - diff;
} else if (newMax > rangeMax) {
diff = rangeMax - prevEnd;
tickOpts.max = rangeMax;
tickOpts.min = prevStart + diff;
}
}
function panTimeScale(scale, delta, panOptions) {
panNumericalScale(scale, delta, panOptions);
var options = scale.options;
if (options.time) {
if (options.time.min) {
options.time.min = options.ticks.min;
}
if (options.time.max) {
options.time.max = options.ticks.max;
}
}
}
function panScale(scale, delta, panOptions) {
var fn = panFunctions[scale.type];
if (fn) {
fn(scale, delta, panOptions);
}
}
function doPan(chartInstance, deltaX, deltaY) {
storeOriginalOptions(chartInstance);
var panOptions = chartInstance.$zoom._options.pan;
if (panOptions.enabled) {
var panMode = typeof panOptions.mode === 'function' ? panOptions.mode({chart: chartInstance}) : panOptions.mode;
helpers.each(chartInstance.scales, function(scale) {
if (scale.isHorizontal() && directionEnabled(panMode, 'x', chartInstance) && deltaX !== 0) {
panOptions.scaleAxes = 'x';
panScale(scale, deltaX, panOptions);
} else if (!scale.isHorizontal() && directionEnabled(panMode, 'y', chartInstance) && deltaY !== 0) {
panOptions.scaleAxes = 'y';
panScale(scale, deltaY, panOptions);
}
});
chartInstance.update(0);
if (typeof panOptions.onPan === 'function') {
panOptions.onPan({chart: chartInstance});
}
}
}
function getXAxis(chartInstance) {
var scales = chartInstance.scales;
var scaleIds = Object.keys(scales);
for (var i = 0; i < scaleIds.length; i++) {
var scale = scales[scaleIds[i]];
if (scale.isHorizontal()) {
return scale;
}
}
}
function getYAxis(chartInstance) {
var scales = chartInstance.scales;
var scaleIds = Object.keys(scales);
for (var i = 0; i < scaleIds.length; i++) {
var scale = scales[scaleIds[i]];
if (!scale.isHorizontal()) {
return scale;
}
}
}
// Store these for later
zoomNS.zoomFunctions.category = zoomCategoryScale;
zoomNS.zoomFunctions.time = zoomTimeScale;
zoomNS.zoomFunctions.linear = zoomNumericalScale;
zoomNS.zoomFunctions.logarithmic = zoomNumericalScale;
zoomNS.panFunctions.category = panCategoryScale;
zoomNS.panFunctions.time = panTimeScale;
zoomNS.panFunctions.linear = panNumericalScale;
zoomNS.panFunctions.logarithmic = panNumericalScale;
// Globals for category pan and zoom
zoomNS.panCumulativeDelta = 0;
zoomNS.zoomCumulativeDelta = 0;
// Chartjs Zoom Plugin
var zoomPlugin = {
id: 'zoom',
afterInit: function(chartInstance) {
chartInstance.resetZoom = function() {
storeOriginalOptions(chartInstance);
var originalOptions = chartInstance.$zoom._originalOptions;
helpers.each(chartInstance.scales, function(scale) {
var timeOptions = scale.options.time;
var tickOptions = scale.options.ticks;
if (originalOptions[scale.id]) {
if (timeOptions) {
timeOptions.min = originalOptions[scale.id].time.min;
timeOptions.max = originalOptions[scale.id].time.max;
}
if (tickOptions) {
tickOptions.min = originalOptions[scale.id].ticks.min;
tickOptions.max = originalOptions[scale.id].ticks.max;
}
} else {
if (timeOptions) {
delete timeOptions.min;
delete timeOptions.max;
}
if (tickOptions) {
delete tickOptions.min;
delete tickOptions.max;
}
}
});
chartInstance.update();
};
},
beforeUpdate: function(chart, options) {
resolveOptions(chart, options);
},
beforeInit: function(chartInstance, pluginOptions) {
chartInstance.$zoom = {
_originalOptions: {}
};
var node = chartInstance.$zoom._node = chartInstance.ctx.canvas;
resolveOptions(chartInstance, pluginOptions);
var options = chartInstance.$zoom._options;
var panThreshold = options.pan && options.pan.threshold;
chartInstance.$zoom._mouseDownHandler = function(event) {
node.addEventListener('mousemove', chartInstance.$zoom._mouseMoveHandler);
chartInstance.$zoom._dragZoomStart = event;
};
chartInstance.$zoom._mouseMoveHandler = function(event) {
if (chartInstance.$zoom._dragZoomStart) {
chartInstance.$zoom._dragZoomEnd = event;
chartInstance.update(0);
}
};
chartInstance.$zoom._mouseUpHandler = function(event) {
Iif (!chartInstance.$zoom._dragZoomStart) {
return;
}
node.removeEventListener('mousemove', chartInstance.$zoom._mouseMoveHandler);
var beginPoint = chartInstance.$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 offsetY = beginPoint.target.getBoundingClientRect().top;
var startY = Math.min(beginPoint.clientY, event.clientY) - offsetY;
var endY = Math.max(beginPoint.clientY, event.clientY) - offsetY;
var dragDistanceX = endX - startX;
var dragDistanceY = endY - startY;
// Remove drag start and end before chart update to stop drawing selected area
chartInstance.$zoom._dragZoomStart = null;
chartInstance.$zoom._dragZoomEnd = null;
var zoomThreshold = options.zoom && options.zoom.threshold || 0;
Iif (dragDistanceX <= zoomThreshold && dragDistanceY <= zoomThreshold) {
return;
}
var chartArea = chartInstance.chartArea;
var zoomOptions = chartInstance.$zoom._options.zoom;
var chartDistanceX = chartArea.right - chartArea.left;
var xEnabled = directionEnabled(zoomOptions.mode, 'x', chartInstance);
var zoomX = xEnabled && dragDistanceX ? 1 + ((chartDistanceX - dragDistanceX) / chartDistanceX) : 1;
var chartDistanceY = chartArea.bottom - chartArea.top;
var yEnabled = directionEnabled(zoomOptions.mode, 'y', chartInstance);
var zoomY = yEnabled && dragDistanceY ? 1 + ((chartDistanceY - dragDistanceY) / chartDistanceY) : 1;
doZoom(chartInstance, zoomX, zoomY, {
x: (startX - chartArea.left) / (1 - dragDistanceX / chartDistanceX) + chartArea.left,
y: (startY - chartArea.top) / (1 - dragDistanceY / chartDistanceY) + chartArea.top
}, undefined, zoomOptions.drag.animationDuration);
Iif (typeof zoomOptions.onZoomComplete === 'function') {
zoomOptions.onZoomComplete({chart: chartInstance});
}
};
var _scrollTimeout = null;
chartInstance.$zoom._wheelHandler = function(event) {
// Prevent the event from triggering the default behavior (eg. Content scrolling).
if (event.cancelable) {
event.preventDefault();
}
// Firefox always fires the wheel event twice:
// First without the delta and right after that once with the delta properties.
if (typeof event.deltaY === 'undefined') {
return;
}
var rect = event.target.getBoundingClientRect();
var offsetX = event.clientX - rect.left;
var offsetY = event.clientY - rect.top;
var center = {
x: offsetX,
y: offsetY
};
var zoomOptions = chartInstance.$zoom._options.zoom;
var speedPercent = zoomOptions.speed;
if (event.deltaY >= 0) {
speedPercent = -speedPercent;
}
doZoom(chartInstance, 1 + speedPercent, 1 + speedPercent, center);
clearTimeout(_scrollTimeout);
_scrollTimeout = setTimeout(function() {
if (typeof zoomOptions.onZoomComplete === 'function') {
zoomOptions.onZoomComplete({chart: chartInstance});
}
}, 250);
};
Iif (Hammer) {
var mc = new Hammer.Manager(node);
mc.add(new Hammer.Pinch());
mc.add(new Hammer.Pan({
threshold: panThreshold
}));
// Hammer reports the total scaling. We need the incremental amount
var currentPinchScaling;
var handlePinch = function(e) {
var diff = 1 / (currentPinchScaling) * e.scale;
var rect = e.target.getBoundingClientRect();
var offsetX = e.center.x - rect.left;
var offsetY = e.center.y - rect.top;
var center = {
x: offsetX,
y: offsetY
};
// fingers position difference
var x = Math.abs(e.pointers[0].clientX - e.pointers[1].clientX);
var y = Math.abs(e.pointers[0].clientY - e.pointers[1].clientY);
// diagonal fingers will change both (xy) axes
var p = x / y;
var xy;
if (p > 0.3 && p < 1.7) {
xy = 'xy';
} else if (x > y) {
xy = 'x'; // x axis
} else {
xy = 'y'; // y axis
}
doZoom(chartInstance, diff, diff, center, xy);
var zoomOptions = chartInstance.$zoom._options.zoom;
if (typeof zoomOptions.onZoomComplete === 'function') {
zoomOptions.onZoomComplete({chart: chartInstance});
}
// Keep track of overall scale
currentPinchScaling = e.scale;
};
mc.on('pinchstart', function() {
currentPinchScaling = 1; // reset tracker
});
mc.on('pinch', handlePinch);
mc.on('pinchend', function(e) {
handlePinch(e);
currentPinchScaling = null; // reset
zoomNS.zoomCumulativeDelta = 0;
});
var currentDeltaX = null;
var currentDeltaY = null;
var panning = false;
var handlePan = function(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() {
currentDeltaX = null;
currentDeltaY = null;
zoomNS.panCumulativeDelta = 0;
setTimeout(function() {
panning = false;
}, 500);
var panOptions = chartInstance.$zoom._options.pan;
if (typeof panOptions.onPanComplete === 'function') {
panOptions.onPanComplete({chart: chartInstance});
}
});
chartInstance.$zoom._ghostClickHandler = function(e) {
if (panning && e.cancelable) {
e.stopImmediatePropagation();
e.preventDefault();
}
};
node.addEventListener('click', chartInstance.$zoom._ghostClickHandler);
chartInstance._mc = mc;
}
},
beforeDatasetsDraw: function(chartInstance) {
var ctx = chartInstance.ctx;
Iif (chartInstance.$zoom._dragZoomEnd) {
var xAxis = getXAxis(chartInstance);
var yAxis = getYAxis(chartInstance);
var beginPoint = chartInstance.$zoom._dragZoomStart;
var endPoint = chartInstance.$zoom._dragZoomEnd;
var startX = xAxis.left;
var endX = xAxis.right;
var startY = yAxis.top;
var endY = yAxis.bottom;
if (directionEnabled(chartInstance.$zoom._options.zoom.mode, 'x', chartInstance)) {
var offsetX = beginPoint.target.getBoundingClientRect().left;
startX = Math.min(beginPoint.clientX, endPoint.clientX) - offsetX;
endX = Math.max(beginPoint.clientX, endPoint.clientX) - offsetX;
}
if (directionEnabled(chartInstance.$zoom._options.zoom.mode, 'y', chartInstance)) {
var offsetY = beginPoint.target.getBoundingClientRect().top;
startY = Math.min(beginPoint.clientY, endPoint.clientY) - offsetY;
endY = Math.max(beginPoint.clientY, endPoint.clientY) - offsetY;
}
var rectWidth = endX - startX;
var rectHeight = endY - startY;
var dragOptions = chartInstance.$zoom._options.zoom.drag;
ctx.save();
ctx.beginPath();
ctx.fillStyle = dragOptions.backgroundColor || 'rgba(225,225,225,0.3)';
ctx.fillRect(startX, startY, rectWidth, rectHeight);
if (dragOptions.borderWidth > 0) {
ctx.lineWidth = dragOptions.borderWidth;
ctx.strokeStyle = dragOptions.borderColor || 'rgba(225,225,225)';
ctx.strokeRect(startX, startY, rectWidth, rectHeight);
}
ctx.restore();
}
},
destroy: function(chartInstance) {
Iif (!chartInstance.$zoom) {
return;
}
var props = chartInstance.$zoom;
var node = props._node;
node.removeEventListener('mousedown', props._mouseDownHandler);
node.removeEventListener('mousemove', props._mouseMoveHandler);
node.ownerDocument.removeEventListener('mouseup', props._mouseUpHandler);
node.removeEventListener('wheel', props._wheelHandler);
node.removeEventListener('click', props._ghostClickHandler);
delete chartInstance.$zoom;
var mc = chartInstance._mc;
Iif (mc) {
mc.remove('pinchstart');
mc.remove('pinch');
mc.remove('pinchend');
mc.remove('panstart');
mc.remove('pan');
mc.remove('panend');
mc.destroy();
}
}
};
Chart.plugins.register(zoomPlugin);
export default zoomPlugin;
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