Current File : //www/varak.net/awstats.varak.net/js/jquery.flot.crosshair.js
/*
Flot plugin for showing a crosshair, thin lines, when the mouse hovers
over the plot.
crosshair: {
mode: null or "x" or "y" or "xy"
color: color
}
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)")
The plugin also adds two public methods:
- setCrosshair(pos)
Set the position of the crosshair. Note that this is cleared if
the user moves the mouse. "pos" should be on the form { x: xpos,
y: ypos } (or x2 and y2 if you're using the secondary 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.
*/
(function($) {
var options = {
crosshair: {
mode: null, // one of null, "x", "y" or "xy",
color: "rgba(170, 0, 0, 0.80)"
}
};
function init(plot) {
// position of crosshair in pixels
var crosshair = {x: -1, y: -1};
plot.setCrosshair = function setCrosshair(pos) {
if (!pos)
crosshair.x = -1;
else {
var axes = plot.getAxes();
crosshair.x = Math.max(0, Math.min(pos.x != null ? axes.xaxis.p2c(pos.x) : axes.x2axis.p2c(pos.x2), plot.width()));
crosshair.y = Math.max(0, Math.min(pos.y != null ? axes.yaxis.p2c(pos.y) : axes.y2axis.p2c(pos.y2), plot.height()));
}
plot.triggerRedrawOverlay();
};
plot.clearCrosshair = plot.setCrosshair; // passes null for pos
plot.hooks.bindEvents.push(function(plot, eventHolder) {
if (!plot.getOptions().crosshair.mode)
return;
eventHolder.mouseout(function() {
if (crosshair.x != -1) {
crosshair.x = -1;
plot.triggerRedrawOverlay();
}
});
eventHolder.mousemove(function(e) {
if (!plot.getSelection()) {
var offset = plot.offset();
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();
}
else
crosshair.x = -1; // hide the crosshair while selecting
});
});
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) {
ctx.strokeStyle = c.color;
ctx.lineWidth = 1;
ctx.lineJoin = "round";
ctx.beginPath();
if (c.mode.indexOf("x") != -1) {
ctx.moveTo(crosshair.x, 0);
ctx.lineTo(crosshair.x, plot.height());
}
if (c.mode.indexOf("y") != -1) {
ctx.moveTo(0, crosshair.y);
ctx.lineTo(plot.width(), crosshair.y);
}
ctx.stroke();
}
ctx.restore();
});
}
$.plot.plugins.push({
init: init,
options: options,
name: 'crosshair',
version: '1.0'
});
})(jQuery);
Mini Shell