Implement FloatRect::squaredDistanceTo function

third_party/WebKit/Source/platform/geometry/FloatRectTest.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "platform/geometry/FloatRect.h"
+
+#include "platform/geometry/FloatPoint.h"
+#include "platform/geometry/GeometryTestHelpers.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+TEST(FloatRectTest, DistanceTest)
+{
+
+    //
+    //  O--x
+    //  |
+    //  y
+    //
+    //     FloatRect.x()   FloatRect.maxX()
+    //            |          |
+    //        1   |    2     |  3
+    //      ======+==========+======   --FloatRect.y()
+    //        4   |    5(in) |  6
+    //      ======+==========+======   --FloatRect.maxY()
+    //        7   |    8     |  9
+    //
+
+    FloatRect r1(100, 100, 250, 150);
+
+    // `1` case
+    FloatPoint p1(80, 80);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p1), 800.f);
+
+    FloatPoint p2(-10, -10);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p2), 24200.f);
+
+    FloatPoint p3(80, -10);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p3), 12500.f);
+
+    // `2` case
+    FloatPoint p4(110, 80);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p4), 400.f);
+
+    FloatPoint p5(150, 0);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p5), 10000.f);
+
+    FloatPoint p6(180, -10);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p6), 12100.f);
+
+    // `3` case
+    FloatPoint p7(400, 80);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p7), 2900.f);
+
+    FloatPoint p8(360, -10);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p8), 12200.f);
+
+    // `4` case
+    FloatPoint p9(80, 110);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p9), 400.f);
+
+    FloatPoint p10(-10, 180);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p10), 12100.f);
+
+    // `5`(& In) case
+    FloatPoint p11(100, 100);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p11), 0.f);
+
+    FloatPoint p12(150, 100);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p12), 0.f);
+
+    FloatPoint p13(350, 100);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p13), 0.f);
+
+    FloatPoint p14(350, 150);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p14), 0.f);
+
+    FloatPoint p15(350, 250);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p15), 0.f);
+
+    FloatPoint p16(150, 250);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p16), 0.f);
+
+    FloatPoint p17(100, 250);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p17), 0.f);
+
+    FloatPoint p18(100, 150);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p18), 0.f);
+
+    FloatPoint p19(150, 150);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p19), 0.f);
+
+    // `6` case
+    FloatPoint p20(380, 150);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p20), 900.f);
+
+    // `7` case
+    FloatPoint p21(80, 280);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p21), 1300.f);
+
+    FloatPoint p22(-10, 300);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p22), 14600.f);
+
+    // `8` case
+    FloatPoint p23(180, 300);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p23), 2500.f);
+
+    // `9` case
+    FloatPoint p24(450, 450);
+    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, r1.distanceTo(p24), 50000.f);
+}
+
+} // namespace blink