Move GridSampler into common package and refactor to ready it for use with Data Matrix

[zxing.git] / core / test / src / com / google / zxing / common / PerspectiveTransformTestCase.java

diff --git a/core/test/src/com/google/zxing/common/PerspectiveTransformTestCase.java b/core/test/src/com/google/zxing/common/PerspectiveTransformTestCase.java
new file mode 100644 (file)
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+++ b/core/test/src/com/google/zxing/common/PerspectiveTransformTestCase.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2007 Google Inc.
+ *
+ * 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.
+ */
+
+package com.google.zxing.common;
+
+import junit.framework.TestCase;
+
+/**
+ * @author srowen@google.com (Sean Owen)
+ */
+public final class PerspectiveTransformTestCase extends TestCase {
+
+  private static final float EPSILON = 0.0001f;
+
+  public void testSquareToQuadrilateral() {
+    PerspectiveTransform pt = PerspectiveTransform.squareToQuadrilateral(
+        2.0f, 3.0f, 10.0f, 4.0f, 16.0f, 15.0f, 4.0f, 9.0f);
+    assertPointEquals(2.0f, 3.0f, 0.0f, 0.0f, pt);
+    assertPointEquals(10.0f, 4.0f, 1.0f, 0.0f, pt);
+    assertPointEquals(4.0f, 9.0f, 0.0f, 1.0f, pt);
+    assertPointEquals(16.0f, 15.0f, 1.0f, 1.0f, pt);
+    assertPointEquals(6.535211f, 6.8873234f, 0.5f, 0.5f, pt);
+    assertPointEquals(48.0f, 42.42857f, 1.5f, 1.5f, pt);
+  }
+
+  public void testQuadrilateralToQuadrilateral() {
+    PerspectiveTransform pt = PerspectiveTransform.quadrilateralToQuadrilateral(
+        2.0f, 3.0f, 10.0f, 4.0f, 16.0f, 15.0f, 4.0f, 9.0f,
+        103.0f, 110.0f, 300.0f, 120.0f, 290.0f, 270.0f, 150.0f, 280.0f);
+    assertPointEquals(103.0f, 110.0f, 2.0f, 3.0f, pt);
+    assertPointEquals(300.0f, 120.0f, 10.0f, 4.0f, pt);
+    assertPointEquals(290.0f, 270.0f, 16.0f, 15.0f, pt);
+    assertPointEquals(150.0f, 280.0f, 4.0f, 9.0f, pt);
+    assertPointEquals(7.1516876f, -64.60185f, 0.5f, 0.5f, pt);
+    assertPointEquals(328.09116f, 334.16385f, 50.0f, 50.0f, pt);
+  }
+
+  private static void assertPointEquals(float expectedX, float expectedY, float sourceX, float sourceY, PerspectiveTransform pt) {
+    float[] points = new float[]{sourceX, sourceY};
+    pt.transformPoints(points);
+    assertEquals(expectedX, points[0], EPSILON);
+    assertEquals(expectedY, points[1], EPSILON);
+  }
+
+}
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