问题
I have a simple Line chart using HighCharts & trying to add draggable plotlines in it.
$(function () {
function draggablePlotLine(axis, plotLineId) {
var clickX, clickY;
var getPlotLine = function () {
for (var i = 0; i < axis.plotLinesAndBands.length; i++) {
if (axis.plotLinesAndBands[i].id === plotLineId) {
return axis.plotLinesAndBands[i];
}
}
};
var getValue = function() {
var plotLine = getPlotLine();
var translation = axis.horiz ? plotLine.svgElem.translateX : plotLine.svgElem.translateY;
var new_value = axis.toValue(translation) - axis.toValue(0) + plotLine.options.value;
new_value = Math.max(axis.min, Math.min(axis.max, new_value));
return new_value;
};
var drag_start = function (e) {
$(document).bind({
'mousemove.line': drag_step,
'mouseup.line': drag_stop
});
var plotLine = getPlotLine();
clickX = e.pageX - plotLine.svgElem.translateX;
clickY = e.pageY - plotLine.svgElem.translateY;
if (plotLine.options.onDragStart) {
plotLine.options.onDragStart(getValue());
}
};
var drag_step = function (e) {
var plotLine = getPlotLine();
var new_translation = axis.horiz ? e.pageX - clickX : e.pageY - clickY;
var new_value = axis.toValue(new_translation) - axis.toValue(0) + plotLine.options.value;
new_value = Math.max(axis.min, Math.min(axis.max, new_value));
new_translation = axis.toPixels(new_value + axis.toValue(0) - plotLine.options.value);
plotLine.svgElem.translate(
axis.horiz ? new_translation : 0,
axis.horiz ? 0 : new_translation);
if (plotLine.options.onDragChange) {
plotLine.options.onDragChange(new_value);
}
};
var drag_stop = function () {
$(document).unbind('.line');
var plotLine = getPlotLine();
var plotLineOptions = plotLine.options;
//Remove + Re-insert plot line
//Otherwise it gets messed up when chart is resized
if (plotLine.svgElem.hasOwnProperty('translateX')) {
plotLineOptions.value = getValue()
axis.removePlotLine(plotLineOptions.id);
axis.addPlotLine(plotLineOptions);
if (plotLineOptions.onDragFinish) {
plotLineOptions.onDragFinish(plotLineOptions.value);
}
}
getPlotLine().svgElem
.css({'cursor': 'pointer'})
.translate(0, 0)
.on('mousedown', drag_start);
};
drag_stop();
};
$('#container').highcharts({
xAxis: {
min: -10,
max: 10,
plotLines: [{
id: 'foo',
color: '#00F',
width: 4,
value: 5,
onDragStart: function (new_value) {
$("#x_value").text(new_value + ' (Not changed yet)');
},
onDragChange: function (new_value) {
$("#x_value").text(new_value + ' (Dragging)');
},
onDragFinish: function (new_value) {
$("#x_value").text(new_value);
}
}]
},
yAxis: {
type: 'logarithmic',
plotLines: [{
label: {
text: 'Not draggable'
},
id: 'y1',
color: '#CCC',
width: 4,
value: 150
}, {
id: 'y2',
color: '#00F',
width: 4,
value: 200,
onDragStart: function (new_value) {
$("#y_value").text(new_value + ' (Not changed yet)');
},
onDragChange: function (new_value) {
$("#y_value").text(new_value + ' (Dragging)');
},
onDragFinish: function (new_value) {
$("#y_value").text(new_value);
}
}, {
label: {
text: 'Not draggable'
},
id: 'y3',
color: '#CCC',
width: 4,
value: 250
}]
},
series: [{
data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
}]
}, function (chart) {
draggablePlotLine(chart.xAxis[0], 'foo');
draggablePlotLine(chart.yAxis[0], 'y2');
console.log('ready');
});
});
JSFiddle Link: http://jsfiddle.net/48awM/30/ (actual) My Forked Update: http://jsfiddle.net/kk8322/z62nnmwe/1/
Actual JSFiddle works fine - which has normal axis scale, but forked version fails while dragging plotline. Only difference between actual & forked version is that my Y-Axis will be of type "Logarithmic".
type: 'logarithmic'
Adding Logarithmic scale for axis is not handling drag/drop properly. Please suggest me how to handle Draggable Plotlines with Logarithmic x/y axis scale.
回答1:
There is a simpler way to move line while drag and drop. It works fine on logarithmic type axis.
Example: http://jsfiddle.net/tret53sv/
$(function () {
var line,
clickX,
clickY;
var start = function (e) {
$(document).bind({
'mousemove.line': step,
'mouseup.line': stop
});
clickY = e.pageY - line.translateY;
//clickY = e.pageY - line.translateY; //uncomment if plotline should be also moved vertically
}
var step = function (e) {
line.translate(e.pageX - clickX, e.pageY - clickY)
}
var stop = function () {
$(document).unbind('.line');
}
$('#container').highcharts({
xAxis: {
categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
},
yAxis:{
type:'logarithmic',
plotLines: [{
color: '#FF0000',
width: 5,
value: 100
}]
},
series: [{
data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
}]
}, function (chart) {
line = chart.yAxis[0].plotLinesAndBands[0].svgElem.attr({
stroke: 'yellow'
})
.css({
'cursor': 'pointer'
})
.translate(0, 0)
.on('mousedown', start);
});
});
回答2:
Thanks for sharing. Works pretty well. I also need to make an draggable or adjustable Plotband. For those who need an example here you can find an quick & dirty example based on Karthikeyan's solution from me.
I also used plotlines to adjust the plotband.
$(function () {
function draggablePlotLineBand(axis, plotLineId, plotBandId, upperLine) {
var clickX, clickY;
var getPlotLine = function () {
for (var i = 0; i < axis.plotLinesAndBands.length; i++) {
if (axis.plotLinesAndBands[i].id === plotLineId) {
return axis.plotLinesAndBands[i];
}
}
};
var getPlotBand = function () {
for (var i = 0; i < axis.plotLinesAndBands.length; i++) {
if (axis.plotLinesAndBands[i].id === plotBandId) {
return axis.plotLinesAndBands[i];
}
}
};
var getFrom = function() {
var plotBand = getPlotBand();
var translation = axis.horiz ? plotBand.svgElem.translateX : plotBand.svgElem.translateY;
var new_value = axis.toValue(translation) - axis.toValue(0) + plotBand.options.from;
new_value = Math.max(axis.min, Math.min(axis.max, new_value));
return new_value;
};
var getTo = function() {
var plotBand = getPlotBand();
var translation = axis.horiz ? plotBand.svgElem.translateX : plotBand.svgElem.translateY;
var new_value = axis.toValue(translation) - axis.toValue(0) + plotBand.options.to;
new_value = Math.max(axis.min, Math.min(axis.max, new_value));
return new_value;
};
var getValue = function() {
var plotLine = getPlotLine();
var translation = axis.horiz ? plotLine.svgElem.translateX : plotLine.svgElem.translateY;
var new_value = axis.toValue(translation) - axis.toValue(0) + plotLine.options.value;
new_value = Math.max(axis.min, Math.min(axis.max, new_value));
return new_value;
};
var drag_start = function (e) {
$(document).bind({
'mousemove.line': drag_step,
'mouseup.line': drag_stop
});
var plotLine = getPlotLine();
var plotBand = getPlotBand();
clickX = e.pageX - plotLine.svgElem.translateX;
clickY = e.pageY - plotLine.svgElem.translateY;
};
var drag_step = function (e) {
var plotLine = getPlotLine();
var plotBand = getPlotBand();
var new_translation = axis.horiz ? e.pageX - clickX : e.pageY - clickY;
var new_value = axis.toValue(new_translation) - axis.toValue(0) + plotLine.options.value;
new_value = Math.max(axis.min, Math.min(axis.max, new_value));
new_translation = axis.toPixels(new_value + axis.toValue(0) - plotLine.options.value);
plotLine.svgElem.translate(
axis.horiz ? new_translation : 0,
axis.horiz ? 0 : new_translation);
var new_value_to = axis.toValue(new_translation) - axis.toValue(0) + plotBand.options.to;
new_value_to = Math.max(axis.min, Math.min(axis.max, new_value_to));
var new_value_from = axis.toValue(new_translation) - axis.toValue(0) + plotBand.options.from;
new_value_from = Math.max(axis.min, Math.min(axis.max, new_value_from));
var newPath = plotBand.svgElem.d.split(' ');
if(upperLine) {
new_translation = axis.toPixels(new_value_to + axis.toValue(0) - plotBand.options.to);
newPath[2] = axis.toPixels(plotBand.options.from) - new_translation;
newPath[5] = axis.toPixels(plotBand.options.from) - new_translation;
} else {
new_translation = axis.toPixels(new_value_from + axis.toValue(0) - plotBand.options.from);
newPath[7] = axis.toPixels(plotBand.options.to) - new_translation;
newPath[9] = axis.toPixels(plotBand.options.to) - new_translation;
}
newPath = newPath.join(" ");
plotBand.svgElem.attr('d', newPath);
plotBand.svgElem.translate(
axis.horiz ? new_translation : 0,
axis.horiz ? 0 : new_translation);
};
var drag_stop = function () {
$(document).unbind('.line');
var plotLine = getPlotLine();
var plotLineOptions = plotLine.options;
var plotBand = getPlotBand();
var plotBandOptions = plotBand.options;
if (plotLine.svgElem.hasOwnProperty('translateX')) {
plotLineOptions.value = getValue();
axis.removePlotLine(plotLineOptions.id);
axis.addPlotLine(plotLineOptions);
}
if (plotBand.svgElem.hasOwnProperty('translateX')) {
if(upperLine) {
plotBandOptions.to = getTo();
axis.removePlotBand(plotBandOptions.id);
axis.addPlotBand(plotBandOptions);
} else {
plotBandOptions.from = getFrom();
axis.removePlotBand(plotBandOptions.id);
axis.addPlotBand(plotBandOptions);
}
}
getPlotLine().svgElem
.css({'cursor': 'pointer'})
.translate(0, 0)
.on('mousedown', drag_start);
};
drag_stop();
};
$('#container').highcharts({
xAxis: {
min: -10,
max: 10
},
yAxis: {
tickInterval: 1,
plotLines: [{
id: 'pl1',
color: "#ffcc00",
width: 4,
value: 3,
zIndex: 3
},{
id: 'pl2',
color: "#ffcc00",
width: 4,
value: 5,
zIndex: 3
}],
plotBands: [{
id: 'pb1',
color: "#ffe682",
width: 1,
from: 3,
to: 5,
zIndex: 2
}]
},
series: [{
data: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
}]
}, function (chart) {
// Need to use the function for both plotlines wih reference to plotband id
// last parameter defines which is the lower(0) and upper(1) plotline
draggablePlotLineBand(chart.yAxis[0], 'pl1', 'pb1', 0);
draggablePlotLineBand(chart.yAxis[0], 'pl2', 'pb1', 1);
});
});
JsFiddle Example Draggable Plotband with Plotlines
来源：https://stackoverflow.com/questions/36862453/highcharts-draggable-plotline-with-logarithmic-axis-scale