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| 58d006 | 1 | /* Flot plugin for showing crosshairs when the mouse hovers over the plot. |
| A | 2 | |
| 3 | Copyright (c) 2007-2013 IOLA and Ole Laursen. | |
| 4 | Licensed under the MIT license. | |
| 5 | ||
| 6 | The plugin supports these options: | |
| 7 | ||
| 8 | crosshair: { | |
| 9 | mode: null or "x" or "y" or "xy" | |
| 10 | color: color | |
| 11 | lineWidth: number | |
| 12 | } | |
| 13 | ||
| 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). | |
| 19 | ||
| 20 | The plugin also adds four public methods: | |
| 21 | ||
| 22 | - setCrosshair( pos ) | |
| 23 | ||
| 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. | |
| 29 | ||
| 30 | - clearCrosshair() | |
| 31 | ||
| 32 | Clear the crosshair. | |
| 33 | ||
| 34 | - lockCrosshair(pos) | |
| 35 | ||
| 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. | |
| 39 | ||
| 40 | Example usage: | |
| 41 | ||
| 42 | var myFlot = $.plot( $("#graph"), ..., { crosshair: { mode: "x" } } }; | |
| 43 | $("#graph").bind( "plothover", function ( evt, position, item ) { | |
| 44 | if ( item ) { | |
| 45 | // Lock the crosshair to the data point being hovered | |
| 46 | myFlot.lockCrosshair({ | |
| 47 | x: item.datapoint[ 0 ], | |
| 48 | y: item.datapoint[ 1 ] | |
| 49 | }); | |
| 50 | } else { | |
| 51 | // Return normal crosshair operation | |
| 52 | myFlot.unlockCrosshair(); | |
| 53 | } | |
| 54 | }); | |
| 55 | ||
| 56 | - unlockCrosshair() | |
| 57 | ||
| 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); | |
