From 8e31247910bbbda8c0fc8cfb2b8b71e1f5a1a024 Mon Sep 17 00:00:00 2001
From: Evan Theurer <theurer@struktur.de>
Date: Thu, 14 Aug 2014 16:41:19 +0200
Subject: [PATCH] Rework how images are auto fit to preview and canvas.

---
 static/js/directives/buddypicturecapture.js |  8 ++--
 static/js/directives/buddypictureupload.js  | 44 ++++++++++++++-------
 2 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/static/js/directives/buddypicturecapture.js b/static/js/directives/buddypicturecapture.js
index a10a8987..9bd5b048 100644
--- a/static/js/directives/buddypicturecapture.js
+++ b/static/js/directives/buddypicturecapture.js
@@ -61,7 +61,7 @@ define(['jquery', 'underscore', 'text!partials/buddypicturecapture.html'], funct
 				}
 			};
 
-			$scope.writeToCanvas = function(canvas, data) {
+			var writeVideoToCanvas = function(canvas) {
 
 				var videoWidth = $scope.video.videoWidth;
 				var videoHeight = $scope.video.videoHeight;
@@ -83,12 +83,12 @@ define(['jquery', 'underscore', 'text!partials/buddypicturecapture.html'], funct
 					height = height * aspectRatio;
 
 				}
-				canvas.getContext("2d").drawImage(data, x, y, width, height);
+				canvas.getContext("2d").drawImage($scope.video, x, y, width, height);
 
 			}
 
 			var writePreviewPic = function() {
-				$scope.writeToCanvas($scope.canvasPrev, $scope.video);
+				writeVideoToCanvas($scope.canvasPrev);
 				$scope.preview = $scope.canvasPrev.toDataURL("image/jpeg");
 			};
 
@@ -167,7 +167,7 @@ define(['jquery', 'underscore', 'text!partials/buddypicturecapture.html'], funct
 			};
 
 			$scope.setAsProfilePicture = function() {
-				$scope.writeToCanvas($scope.canvasPic, $scope.video);
+				writeVideoToCanvas($scope.canvasPic);
 				$scope.user.buddyPicture = $scope.canvasPic.toDataURL("image/jpeg");
 				//console.info("Image size", $scope.user.buddyPicture.length);
 				$scope.cancelPicture();
diff --git a/static/js/directives/buddypictureupload.js b/static/js/directives/buddypictureupload.js
index 34762f37..99949a6f 100644
--- a/static/js/directives/buddypictureupload.js
+++ b/static/js/directives/buddypictureupload.js
@@ -41,20 +41,9 @@ define(['jquery', 'underscore', 'text!partials/buddypictureupload.html'], functi
 			var setUploadImageDimension = function(data) {
 				var img = new Image();
 				img.onload = function() {
-					if(this.width < previewWidth && this.height < previewHeight) {
-						$scope.prevImage.style.height = null;
-						$scope.prevImage.style.width = null;
-						return;
-					}
-					if (this.width < this.height) {
-						$scope.prevImage.style.width = previewWidth + 'px';
-						$scope.prevImage.style.height = null;
-						console.log('changed width');
-					} else {
-						$scope.prevImage.style.height = previewHeight + 'px';
-						$scope.prevImage.style.width = null;
-						console.log('changed height');
-					}
+					var dim = getAutoFitDimensions(this, {width: previewWidth, height: previewHeight});
+					$scope.prevImage.style.width = dim.width + 'px';
+					$scope.prevImage.style.height = dim.height + 'px';
 				};
 				img.src = data;
 			};
@@ -108,8 +97,33 @@ define(['jquery', 'underscore', 'text!partials/buddypictureupload.html'], functi
 				}
 			};
 
+			// Auto fit by smallest dimension
+			var getAutoFitDimensions = function(from, to) {
+				if(!from.width && !from.height && !to.width && !to.height) {
+					return null;
+				}
+				var width = null;
+				var height = null;
+
+				if (from.width < from.height) {
+					height = to.width * (from.height/from.width);
+					width = to.width;
+				} else {
+					height = to.height;
+					width = to.height * (from.width/from.height);
+				}
+				return{width: width, height: height};
+			};
+
+			var writeUploadToCanvas = function(canvas, img) {
+				var x = 0;
+				var y = 0;
+				var dim = getAutoFitDimensions(img, canvas);
+				canvas.getContext("2d").drawImage(img, x, y, dim.width, dim.height);
+			};
+
 			$scope.usePicture = function() {
-				$scope.writeToCanvas($scope.canvasPic, $scope.prevImage);
+				writeUploadToCanvas($scope.canvasPic, $scope.prevImage);
 				$scope.user.buddyPicture = $scope.canvasPic.toDataURL("image/jpeg");
 				$scope.reset();
 				safeApply($scope);