From af26aaa53d073a7b2d25caee93e1cb5ceb2e099c Mon Sep 17 00:00:00 2001
From: Igor Sfiligoi <isfiligoi@ucsd.edu>
Date: Fri, 23 Oct 2009 09:07:01 -0400
Subject: flot-0.6

---
 jquery.flot.crosshair.js | 156 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 jquery.flot.crosshair.js

(limited to 'jquery.flot.crosshair.js')

diff --git a/jquery.flot.crosshair.js b/jquery.flot.crosshair.js
new file mode 100644
index 0000000..11be113
--- /dev/null
+++ b/jquery.flot.crosshair.js
@@ -0,0 +1,156 @@
+/*
+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
+    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" 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.
+
+  - 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 };
+
+        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.lockCrosshair = function lockCrosshair(pos) {
+            if (pos)
+                plot.setCrosshair(pos);
+            crosshair.locked = true;
+        }
+
+        plot.unlockCrosshair = function unlockCrosshair() {
+            crosshair.locked = false;
+        }
+
+        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 && plot.getSelection()) {
+                    crosshair.x = -1; // hide the crosshair while selecting
+                    return;
+                }
+                
+                if (crosshair.locked)
+                    return;
+                
+                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();
+            });
+        });
+
+        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 = c.lineWidth;
+                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);
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