Simple tests for getContentDimensions

tests/jsunit/index.html

@@ -20,6 +20,7 @@
     <script src="gesture_test.js"></script>
     <script src="input_test.js"></script>
     <script src="json_test.js"></script>
+    <script src="metrics_test.js"></script>
     <script src="names_test.js"></script>
     <script src="procedures_test.js"></script>
     <script src="utils_test.js"></script>

tests/jsunit/metrics_test.js

@@ -0,0 +1,127 @@
+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2018 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+'use strict';
+
+function assertDimensionsMatch(toCheck, left, top, width, height) {
+  assertEquals('Top did not match.', top, toCheck.top);
+  assertEquals('Left did not match.', left, toCheck.left);
+  assertEquals('Width did not match.', width, toCheck.width);
+  assertEquals('Height did not match.', height, toCheck.height);
+}
+
+/**
+ * Make a mock workspace object with two properties: getBlocksBoundingBox and
+ * scale.
+ */
+function makeMockWs(scale, x, y, width, height) {
+  return {
+    getBlocksBoundingBox: function() {
+      return {
+        width: width,
+        height: height,
+        x: x,
+        y: y
+      }
+    },
+    scale: 1
+  };
+}
+
+// Empty workspace.
+var test_GetContentDimensionsExact_empty = function() {
+  var ws = makeMockWs(1, 0, 0, 0, 0)
+  var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  assertDimensionsMatch(defaultZoom, 0, 0, 0, 0);
+
+  // zoom in.
+  ws.scale = 2;
+  var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  assertDimensionsMatch(zoomIn, 0, 0, 0, 0);
+
+  // zoom out.
+  ws.scale = .5;
+  var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  assertDimensionsMatch(zoomOut, 0, 0, 0, 0);
+};
+
+// Non-empty workspace, with top-left corner at ws origin.
+var test_GetContentDimensionsExact_nonEmptyAtOrigin = function() {
+  var ws = makeMockWs(1, 0, 0, 100, 100)
+  var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // Pixel and ws units are the same at default zoom.
+  assertDimensionsMatch(defaultZoom, 0, 0, 100, 100);
+
+  // zoom in.
+  ws.scale = 2;
+  var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // 1 ws unit = 2 pixels at this zoom level.
+  assertDimensionsMatch(zoomIn, 0, 0, 200, 200);
+
+  // zoom out.
+  ws.scale = .5;
+  var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // 1 ws unit = 0.5 pixels at this zoom level.
+  assertDimensionsMatch(zoomOut, 0, 0, 50, 50);
+};
+
+// Non-empty workspace, with top-left corner in positive ws coordinates.
+var test_GetContentDimensionsExact_nonEmptyPositiveOrigin = function() {
+  var ws = makeMockWs(1, 10, 10, 100, 100)
+  var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // Pixel and ws units are the same at default zoom.
+  assertDimensionsMatch(defaultZoom, 10, 10, 100, 100);
+
+  // Changing zoom will change both width/height and origin location in pixels.
+
+  // zoom in.
+  ws.scale = 2;
+  var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // 1 ws unit = 2 pixels at this zoom level.
+  assertDimensionsMatch(zoomIn, 20, 20, 200, 200);
+
+  // zoom out.
+  ws.scale = .5;
+  var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // 1 ws unit = 0.5 pixels at this zoom level.
+  assertDimensionsMatch(zoomOut, 5, 5, 50, 50);
+};
+
+// Non-empty workspace, with top-left corner in negative ws coordinates.
+var test_GetContentDimensionsExact_nonEmptyNegativeOrigin = function() {
+  var ws = makeMockWs(1, -10, -10, 100, 100)
+  var defaultZoom = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // Pixel and ws units are the same at default zoom.
+  assertDimensionsMatch(defaultZoom, -10, -10, 100, 100);
+
+  // Changing zoom will change both width/height and origin location in pixels.
+
+  // zoom in.
+  ws.scale = 2;
+  var zoomIn = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // 1 ws unit = 2 pixels at this zoom level.
+  assertDimensionsMatch(zoomIn, -20, -20, 200, 200);
+
+  // zoom out.
+  ws.scale = .5;
+  var zoomOut = Blockly.WorkspaceSvg.getContentDimensionsExact_(ws);
+  // 1 ws unit = 0.5 pixels at this zoom level.
+  assertDimensionsMatch(zoomOut, -5, -5, 50, 50);
+};
+