Removed work-around for slow jQuery mousemove events (closing issue
134), add new hooks and new API for interactive plugins, move crosshair support to plugin git-svn-id: https://flot.googlecode.com/svn/trunk@159 1e0a6537-2640-0410-bfb7-f154510ff394pull/1/head
olau@iola.dk
17 years ago
parent
1f1866e6ed
commit
d3acc16e46
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/*
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Flot plugin for showing a crosshair, thin lines, when the mouse hovers
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over the plot.
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crosshair: {
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mode: null or "x" or "y" or "xy"
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color: color
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}
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Set the mode to one of "x", "y" or "xy". The "x" mode enables a
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vertical crosshair that lets you trace the values on the x axis, "y"
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enables a horizontal crosshair and "xy" enables them both. "color" is
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the color of the crosshair (default is "rgba(170, 0, 0, 0.80)")
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The plugin also adds two public methods:
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- setCrosshair(pos)
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Set the position of the crosshair. Note that this is cleared if
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the user moves the mouse. "pos" should be on the form { x: xpos,
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y: ypos } (or x2 and y2 if you're using the secondary axes), which
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is coincidentally the same format as what you get from a "plothover"
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event. If "pos" is null, the crosshair is cleared.
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- clearCrosshair()
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Clear the crosshair.
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*/
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(function ($) {
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var options = {
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crosshair: {
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mode: null, // one of null, "x", "y" or "xy",
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color: "rgba(170, 0, 0, 0.80)"
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}
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};
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function init(plot) {
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// position of crosshair in pixels
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var crosshair = { x: -1, y: -1 };
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plot.setCrosshair = function setCrosshair(pos) {
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if (!pos)
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crosshair.x = -1;
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else {
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var axes = plot.getAxes();
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crosshair.x = Math.max(0, Math.min(pos.x != null ? axes.xaxis.p2c(pos.x) : axes.x2axis.p2c(pos.x2), plot.width()));
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crosshair.y = Math.max(0, Math.min(pos.y != null ? axes.yaxis.p2c(pos.y) : axes.y2axis.p2c(pos.y2), plot.height()));
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}
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plot.triggerRedrawOverlay();
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};
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plot.clearCrosshair = plot.setCrosshair; // passes null for pos
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plot.hooks.bindEvents.push(function (plot, eventHolder) {
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if (!plot.getOptions().crosshair.mode)
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return;
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eventHolder.mouseout(function () {
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if (crosshair.x != -1) {
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crosshair.x = -1;
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plot.triggerRedrawOverlay();
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}
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});
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eventHolder.mousemove(function (e) {
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if (!plot.getSelection()) {
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var offset = plot.offset();
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crosshair.x = Math.max(0, Math.min(e.pageX - offset.left, plot.width()));
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crosshair.y = Math.max(0, Math.min(e.pageY - offset.top, plot.height()));
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plot.triggerRedrawOverlay();
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}
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else
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crosshair.x = -1; // hide the crosshair while selecting
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});
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});
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plot.hooks.drawOverlay.push(function (plot, ctx) {
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var c = plot.getOptions().crosshair;
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if (!c.mode)
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return;
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var plotOffset = plot.getPlotOffset();
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ctx.save();
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ctx.translate(plotOffset.left, plotOffset.top);
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if (crosshair.x != -1) {
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ctx.strokeStyle = c.color;
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ctx.lineWidth = 1;
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ctx.lineJoin = "round";
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ctx.beginPath();
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if (c.mode.indexOf("x") != -1) {
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ctx.moveTo(crosshair.x, 0);
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ctx.lineTo(crosshair.x, plot.height());
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}
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if (c.mode.indexOf("y") != -1) {
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ctx.moveTo(0, crosshair.y);
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ctx.lineTo(plot.width(), crosshair.y);
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}
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ctx.stroke();
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}
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ctx.restore();
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});
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}
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$.plot.plugins.push({
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init: init,
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options: options,
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name: 'crosshair',
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version: '1.0'
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});
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})(jQuery);
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