PointerEvent: set pressure to 0 unless pointer is down

AUTHORS.txt

@@ -1,5 +1,6 @@
 Authors ordered by first contribution
 
+Google, Inc.
 Daniel Freedman <dfreedm@google.com>
 Boris Smus <boris@smus.com>
 Yvonne Yip <ykyyip@google.com>
@@ -23,3 +24,6 @@ Stefan Neubert <dev@steditor.net>
 Jörn Zaefferer <joern.zaefferer@gmail.com>
 Marius Stefan Bethge <marius.bethge@gmail.com>
 Rob Larsen <rob@htmlcssjavascript.com>
+Alexander Schmitz <arschmitz@gmail.com>
+Robert Tuttle <robert.tuttle@frogdesign.com>
+Brenton Simpson <appsforartists@google.com>

Gruntfile.js

@@ -31,6 +31,11 @@ module.exports = function(grunt) {
   var allFiles = srcFiles.concat(buildFiles).concat(testFiles);
 
   grunt.initConfig({
+    authors: {
+      prior: [
+        'Google, Inc.'
+      ]
+    },
     uglify: {
       pointerevents: {
         options: {

src/PointerEvent.js

@@ -67,7 +67,8 @@ function PointerEvent(inType, inDict) {
   // Spec requires that pointers without pressure specified use 0.5 for down
   // state and 0 for up state.
   var pressure = 0;
-  if (inDict.pressure) {
+
+  if (inDict.pressure && e.buttons) {
     pressure = inDict.pressure;
   } else {
     pressure = e.buttons ? 0.5 : 0;