/* Flot plugin for showing crosshairs when the mouse hovers over the plot. Copyright (c) 2007-2014 IOLA and Ole Laursen. Licensed under the MIT license. The plugin supports these options: crosshair: { mode: null or "x" or "y" or "xy" color: color lineWidth: number } Set the mode to one of "x", "y" or "xy". The "x" mode enables a vertical crosshair that lets you trace the values on the x axis, "y" enables a horizontal crosshair and "xy" enables them both. "color" is the color of the crosshair (default is "rgba(170, 0, 0, 0.80)"), "lineWidth" is the width of the drawn lines (default is 1). The plugin also adds four public methods: - setCrosshair( pos ) Set the position of the crosshair. Note that this is cleared if the user moves the mouse. "pos" is in coordinates of the plot and should be on the form { x: xpos, y: ypos } (you can use x2/x3/... if you're using multiple axes), which is coincidentally the same format as what you get from a "plothover" event. If "pos" is null, the crosshair is cleared. - clearCrosshair() Clear the crosshair. - lockCrosshair(pos) Cause the crosshair to lock to the current location, no longer updating if the user moves the mouse. Optionally supply a position (passed on to setCrosshair()) to move it to. Example usage: var myFlot = $.plot( $("#graph"), ..., { crosshair: { mode: "x" } } }; $("#graph").bind( "plothover", function ( evt, position, item ) { if ( item ) { // Lock the crosshair to the data point being hovered myFlot.lockCrosshair({ x: item.datapoint[ 0 ], y: item.datapoint[ 1 ] }); } else { // Return normal crosshair operation myFlot.unlockCrosshair(); } }); - unlockCrosshair() Free the crosshair to move again after locking it. */ (function ($) { var options = { crosshair: { mode: null, // one of null, "x", "y" or "xy", color: "rgba(170, 0, 0, 0.80)", lineWidth: 1 } }; function init(plot) { // position of crosshair in pixels var crosshair = {x: -1, y: -1, locked: false, highlighted: false}; plot.setCrosshair = function setCrosshair(pos) { if (!pos) { crosshair.x = -1; } else { var o = plot.p2c(pos); crosshair.x = Math.max(0, Math.min(o.left, plot.width())); crosshair.y = Math.max(0, Math.min(o.top, plot.height())); } plot.triggerRedrawOverlay(); }; plot.clearCrosshair = plot.setCrosshair; // passes null for pos plot.lockCrosshair = function lockCrosshair(pos) { if (pos) { plot.setCrosshair(pos); } crosshair.locked = true; }; plot.unlockCrosshair = function unlockCrosshair() { crosshair.locked = false; crosshair.rect = null; }; function onMouseOut(e) { if (crosshair.locked) { return; } if (crosshair.x !== -1) { crosshair.x = -1; plot.triggerRedrawOverlay(); } } function onMouseMove(e) { var offset = plot.offset(); if (crosshair.locked) { var mouseX = Math.max(0, Math.min(e.pageX - offset.left, plot.width())); var mouseY = Math.max(0, Math.min(e.pageY - offset.top, plot.height())); if ((mouseX > crosshair.x - 4) && (mouseX < crosshair.x + 4) && (mouseY > crosshair.y - 4) && (mouseY < crosshair.y + 4)) { if (!crosshair.highlighted) { crosshair.highlighted = true; plot.triggerRedrawOverlay(); } } else { if (crosshair.highlighted) { crosshair.highlighted = false; plot.triggerRedrawOverlay(); } } return; } if (plot.getSelection && plot.getSelection()) { crosshair.x = -1; // hide the crosshair while selecting return; } crosshair.x = Math.max(0, Math.min(e.pageX - offset.left, plot.width())); crosshair.y = Math.max(0, Math.min(e.pageY - offset.top, plot.height())); plot.triggerRedrawOverlay(); } plot.hooks.bindEvents.push(function (plot, eventHolder) { if (!plot.getOptions().crosshair.mode) { return; } eventHolder.mouseout(onMouseOut); eventHolder.mousemove(onMouseMove); }); plot.hooks.drawOverlay.push(function (plot, ctx) { var c = plot.getOptions().crosshair; if (!c.mode) { return; } var plotOffset = plot.getPlotOffset(); ctx.save(); ctx.translate(plotOffset.left, plotOffset.top); if (crosshair.x !== -1) { var adj = plot.getOptions().crosshair.lineWidth % 2 ? 0.5 : 0; ctx.strokeStyle = c.color; ctx.lineWidth = c.lineWidth; ctx.lineJoin = "round"; ctx.beginPath(); if (c.mode.indexOf("x") !== -1) { var drawX = Math.floor(crosshair.x) + adj; ctx.moveTo(drawX, 0); ctx.lineTo(drawX, plot.height()); } if (c.mode.indexOf("y") !== -1) { var drawY = Math.floor(crosshair.y) + adj; ctx.moveTo(0, drawY); ctx.lineTo(plot.width(), drawY); } if (crosshair.locked) { if (crosshair.highlighted) ctx.fillStyle = 'orange'; else ctx.fillStyle = c.color; ctx.fillRect(Math.floor(crosshair.x) + adj - 4, Math.floor(crosshair.y) + adj - 4, 8, 8); } ctx.stroke(); } ctx.restore(); }); plot.hooks.shutdown.push(function (plot, eventHolder) { eventHolder.unbind("mouseout", onMouseOut); eventHolder.unbind("mousemove", onMouseMove); }); } $.plot.plugins.push({ init: init, options: options, name: 'crosshair', version: '1.0' }); })(jQuery);