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- /* Flot plugin for showing crosshairs when the mouse hovers over the plot.
- Copyright (c) 2007-2013 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(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);
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