X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=auto_tests%2Ftests%2FCanvasAssertions.js;h=4059a0aeee189614ef6fceb62dc4e9e2c9f9f24f;hb=ccb0001c3c8aadd02358995c8d7b71fbb37c0bc3;hp=1ef0573ae2e859fd11efd18427b004dd625399c0;hpb=02eb7ae72eb3d5e83c2bf546d1fc2a6a60b91008;p=dygraphs.git

diff --git a/auto_tests/tests/CanvasAssertions.js b/auto_tests/tests/CanvasAssertions.js
index 1ef0573..4059a0a 100644
--- a/auto_tests/tests/CanvasAssertions.js
+++ b/auto_tests/tests/CanvasAssertions.js
@@ -83,7 +83,73 @@ CanvasAssertions.assertLineDrawn = function(proxy, p1, p2, attrs) {
   };
   fail("Can't find a line drawn between " + p1 +
       " and " + p2 + " with attributes " + toString(attrs));
-}
+};
+
+/**
+ * Return the lines drawn with specific attributes.
+ *
+ * This merely looks for one of these four possibilities:
+ * moveTo(p1) -> lineTo(p2)
+ * moveTo(p2) -> lineTo(p1)
+ * lineTo(p1) -> lineTo(p2)
+ * lineTo(p2) -> lineTo(p1)
+ *
+ * attrs is meant to be used when you want to track things like
+ * color and stroke width.
+ */
+CanvasAssertions.getLinesDrawn = function(proxy) {
+  var lastCall;
+  var lines = [];
+  for (var i = 0; i < proxy.calls__.length; i++) {
+    var call = proxy.calls__[i];
+
+    if (call.name == "lineTo") {
+      if (lastCall != null) {
+        lines.push([lastCall, call]);
+      }
+    }
+
+    lastCall = (call.name === "lineTo" || call.name === "moveTo") ? call : null;
+  }
+  return lines;
+};
+
+/**
+ * Verifies that every call to context.save() has a matching call to
+ * context.restore().
+ */
+CanvasAssertions.assertBalancedSaveRestore = function(proxy) {
+  var depth = 0;
+  for (var i = 0; i < proxy.calls__.length; i++) {
+    var call = proxy.calls__[i];
+    if (call.name == "save") depth++
+    if (call.name == "restore") {
+      if (depth == 0) {
+        fail("Too many calls to restore()");
+      }
+      depth--;
+    }
+  }
+
+  if (depth > 0) {
+    fail("Missing matching 'context.restore()' calls.");
+  }
+};
+
+/**
+ * Checks how many lines of the given color have been drawn.
+ * @return {Integer} The number of lines of the given color.
+ */
+CanvasAssertions.numLinesDrawn = function(proxy, color) {
+  var num_lines = 0;
+  for (var i = 0; i < proxy.calls__.length; i++) {
+    var call = proxy.calls__[i];
+    if (call.name == "lineTo" && call.properties.strokeStyle == color) {
+      num_lines++;
+    }
+  }
+  return num_lines;
+};
 
 CanvasAssertions.matchPixels = function(expected, actual) {
   // Expect array of two integers. Assuming the values are within one
@@ -91,7 +157,7 @@ CanvasAssertions.matchPixels = function(expected, actual) {
   // who knows what pixel a value of 5.8888 results in.
   return Math.abs(expected[0] - actual[0]) < 1 &&
       Math.abs(expected[1] - actual[1]) < 1;
-}
+};
 
 CanvasAssertions.matchAttributes = function(expected, actual) {
   for (var attr in expected) {
@@ -100,4 +166,4 @@ CanvasAssertions.matchAttributes = function(expected, actual) {
     }
   }
   return true;
-}
+};