[10/10] webos commit: Added initial compass support

[he...@apache.org]

Added initial compass support


Project: http://git-wip-us.apache.org/repos/asf/incubator-cordova-webos/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-cordova-webos/commit/7eeda79d
Tree: http://git-wip-us.apache.org/repos/asf/incubator-cordova-webos/tree/7eeda79d
Diff: http://git-wip-us.apache.org/repos/asf/incubator-cordova-webos/diff/7eeda79d

Branch: refs/heads/master
Commit: 7eeda79d34df3db0c469091d9e41b2d50b5d38bb
Parents: e1ca3d8
Author: Markus Leutwyler <ml...@yahoo.com>
Authored: Wed Mar 7 14:07:15 2012 +0100
Committer: Markus Leutwyler <ml...@yahoo.com>
Committed: Wed Mar 7 14:07:15 2012 +0100

----------------------------------------------------------------------
 Makefile      |    1 +
 js/compass.js |  102 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+), 0 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-cordova-webos/blob/7eeda79d/Makefile
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diff --git a/Makefile b/Makefile
index 92162ba..77d3b17 100755
--- a/Makefile
+++ b/Makefile
@@ -56,6 +56,7 @@ lib/phonegap.js: js/phonegap-core.js js/acceleration.js js/accelerometer.js js/a
 	$(CAT) js/audio.js >> $@
 	$(CAT) js/camera.js >> $@
 	$(CAT) js/contacts.js >> $@
+	$(CAT) js/compass.js >> $@
 	$(CAT) js/debugconsole.js >> $@
 	$(CAT) js/device.js >> $@
 	$(CAT) js/file.js >> $@

http://git-wip-us.apache.org/repos/asf/incubator-cordova-webos/blob/7eeda79d/js/compass.js
----------------------------------------------------------------------
diff --git a/js/compass.js b/js/compass.js
new file mode 100644
index 0000000..824d0df
--- /dev/null
+++ b/js/compass.js
@@ -0,0 +1,102 @@
+/*
+ * This class provides access to device compass data.
+ * @constructor
+ */
+function Compass() {
+  /*
+	 * The last known heading.
+	 */
+	this.lastHeading = null;
+};
+
+/*
+ * Asynchronously aquires the current compass heading.
+ * @param {Function} successCallback The function to call when the compass
+ * data is available
+ * @param {Function} errorCallback The function to call when there is an error 
+ * getting the compass data.
+ * @param {CompassOptions} options The options for getting the compass data
+ * such as timeout.
+ */
+
+Compass.prototype.getCurrentHeading = function(successCallback, errorCallback, options) {
+
+    var referenceTime = 0;
+    if (this.lastHeading)
+        referenceTime = this.lastHeading.timestamp;
+    else
+        this.start();
+ 
+    var timeout = 20000;
+    var interval = 500;
+    if (typeof(options) == 'object' && options.interval)
+        interval = options.interval;
+ 
+    if (typeof(successCallback) != 'function')
+        successCallback = function() {};
+    if (typeof(errorCallback) != 'function')
+        errorCallback = function() {};
+ 
+    var dis = this;
+    var delay = 0;
+    var timer = setInterval(function() {
+        delay += interval;
+ 
+		//if we have a new compass heading, call success and cancel the timer
+        if (typeof(dis.lastHeading) == 'object' && dis.lastHeading != null && dis.lastHeading.timestamp > referenceTime) {
+            successCallback(dis.lastHeading.magHeading);
+            clearInterval(timer);
+        } else if (delay >= timeout) { //else if timeout has occured then call error and cancel the timer
+            errorCallback();
+            clearInterval(timer);
+        }
+		//else the interval gets called again
+    }, interval);
+};
+
+
+/*
+ * Asynchronously aquires the compass heading repeatedly at a given interval.
+ * @param {Function} successCallback The function to call each time the acceleration
+ * data is available
+ * @param {Function} errorCallback The function to call when there is an error 
+ * getting the compass data.
+ * @param {CompassOptions} options The options for getting the compass data
+ * such as timeout.
+ */
+
+Compass.prototype.watchHeading = function(successCallback, errorCallback, options) {
+	this.getCurrentHeading(successCallback, errorCallback, options);
+	// TODO: add the interval id to a list so we can clear all watches
+ 	var frequency = (options != undefined)? options.frequency : 10000;
+	var that = this;
+	return setInterval(function() {
+		that.getCurrentHeading(successCallback, errorCallback, options);
+	}, frequency);
+};
+
+/*
+ * Clears the specified heading watch.
+ * @param {String} watchId The ID of the watch returned from #watchHeading.
+ */
+Compass.prototype.clearWatch = function(watchId) {
+	clearInterval(watchId);
+};
+
+/*
+ * Starts the native compass listener.
+ */
+
+Compass.prototype.start = function() {
+	var that = this;
+	//Mojo.Event.listen(document, "acceleration", function(event) {
+	document.addEventListener("compass", function(event) {
+		var heading={};
+    heading.trueHeading=event.trueHeading;
+    heading.magHeading=event.magHeading;
+    heading.timestamp = new Date().getTime();
+		that.lastHeading = heading;
+	});
+};
+
+if (typeof navigator.compass == "undefined") navigator.compass = new Compass();