1 /* Flot plugin for showing crosshairs when the mouse hovers over the plot.
3 Copyright (c) 2007-2013 IOLA and Ole Laursen.
4 Licensed under the MIT license.
6 The plugin supports these options:
9 mode: null or "x" or "y" or "xy"
14 Set the mode to one of "x", "y" or "xy". The "x" mode enables a vertical
15 crosshair that lets you trace the values on the x axis, "y" enables a
16 horizontal crosshair and "xy" enables them both. "color" is the color of the
17 crosshair (default is "rgba(170, 0, 0, 0.80)"), "lineWidth" is the width of
18 the drawn lines (default is 1).
20 The plugin also adds four public methods:
24 Set the position of the crosshair. Note that this is cleared if the user
25 moves the mouse. "pos" is in coordinates of the plot and should be on the
26 form { x: xpos, y: ypos } (you can use x2/x3/... if you're using multiple
27 axes), which is coincidentally the same format as what you get from a
28 "plothover" event. If "pos" is null, the crosshair is cleared.
36 Cause the crosshair to lock to the current location, no longer updating if
37 the user moves the mouse. Optionally supply a position (passed on to
38 setCrosshair()) to move it to.
42 var myFlot = $.plot( $("#graph"), ..., { crosshair: { mode: "x" } } };
43 $("#graph").bind( "plothover", function ( evt, position, item ) {
45 // Lock the crosshair to the data point being hovered
46 myFlot.lockCrosshair({
47 x: item.datapoint[ 0 ],
48 y: item.datapoint[ 1 ]
51 // Return normal crosshair operation
52 myFlot.unlockCrosshair();
58 Free the crosshair to move again after locking it.
59 */(function(e){function n(e){function n(n){if(t.locked)return;t.x!=-1&&(t.x=-1,e.triggerRedrawOverlay())}function r(n){if(t.locked)return;if(e.getSelection&&e.getSelection()){t.x=-1;return}var r=e.offset();t.x=Math.max(0,Math.min(n.pageX-r.left,e.width())),t.y=Math.max(0,Math.min(n.pageY-r.top,e.height())),e.triggerRedrawOverlay()}var t={x:-1,y:-1,locked:!1};e.setCrosshair=function(r){if(!r)t.x=-1;else{var i=e.p2c(r);t.x=Math.max(0,Math.min(i.left,e.width())),t.y=Math.max(0,Math.min(i.top,e.height()))}e.triggerRedrawOverlay()},e.clearCrosshair=e.setCrosshair,e.lockCrosshair=function(r){r&&e.setCrosshair(r),t.locked=!0},e.unlockCrosshair=function(){t.locked=!1},e.hooks.bindEvents.push(function(e,t){if(!e.getOptions().crosshair.mode)return;t.mouseout(n),t.mousemove(r)}),e.hooks.drawOverlay.push(function(e,n){var r=e.getOptions().crosshair;if(!r.mode)return;var i=e.getPlotOffset();n.save(),n.translate(i.left,i.top);if(t.x!=-1){var s=e.getOptions().crosshair.lineWidth%2===0?0:.5;n.strokeStyle=r.color,n.lineWidth=r.lineWidth,n.lineJoin="round",n.beginPath();if(r.mode.indexOf("x")!=-1){var o=Math.round(t.x)+s;n.moveTo(o,0),n.lineTo(o,e.height())}if(r.mode.indexOf("y")!=-1){var u=Math.round(t.y)+s;n.moveTo(0,u),n.lineTo(e.width(),u)}n.stroke()}n.restore()}),e.hooks.shutdown.push(function(e,t){t.unbind("mouseout",n),t.unbind("mousemove",r)})}var t={crosshair:{mode:null,color:"rgba(170, 0, 0, 0.80)",lineWidth:1}};e.plot.plugins.push({init:n,options:t,name:"crosshair",version:"1.0"})})(jQuery);