gui: Add QuadTree and tests

1 files changed, 127 insertions, 0 deletions

diff --git a/tests/gui/quadtree.cc b/tests/gui/quadtree.cc
new file mode 100644
index 00000000..ca90a426
--- /dev/null
+++ b/tests/gui/quadtree.cc
@@ -0,0 +1,127 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Serge Bazanski <q3k@symbioticeda.com>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "gtest/gtest.h"
+#include "nextpnr.h"
+#include "quadtree.h"
+
+USING_NEXTPNR_NAMESPACE
+
+using QT = QuadTree<int, int>;
+
+class QuadTreeTest : public ::testing::Test
+{
+  protected:
+    virtual void SetUp()
+    {
+       qt_ = new QT(QT::BoundingBox(0, 0, width_, height_));
+    }
+    virtual void TearDown()
+    {
+       delete qt_;
+    }
+
+  int width_ = 100;
+  int height_ = 100;
+  QT *qt_;
+};
+
+// Test that we're doing bound checking correctly.
+TEST_F(QuadTreeTest, insert_bound_checking)
+{
+    ASSERT_TRUE(qt_->insert(QT::BoundingBox(10, 10, 20, 20), 10));
+    ASSERT_TRUE(qt_->insert(QT::BoundingBox(0, 0, 100, 100), 10));
+    ASSERT_FALSE(qt_->insert(QT::BoundingBox(10, 10, 101, 20), 10));
+    ASSERT_FALSE(qt_->insert(QT::BoundingBox(-1, 10, 101, 20), 10));
+    ASSERT_FALSE(qt_->insert(QT::BoundingBox(-1, -1, 20, 20), 10));
+}
+
+// Test whether we are not losing any elements.
+TEST_F(QuadTreeTest, insert_count)
+{
+    auto rng = NEXTPNR_NAMESPACE::DeterministicRNG();
+
+    // Add 10000 random rectangles.
+    for (int i = 0; i < 10000; i++) {
+        int x0 = rng.rng(width_);
+        int y0 = rng.rng(height_);
+        int w = rng.rng(width_ - x0);
+        int h = rng.rng(width_ - y0);
+        int x1 = x0 + w;
+        int y1 = y0 + h;
+        ASSERT_TRUE(qt_->insert(QT::BoundingBox(x0, y0, x1, y1), i));
+        ASSERT_EQ(qt_->size(), i+1);
+    }
+    // Add 100000 random points.
+    for (int i = 0; i < 100000; i++) {
+        int x0 = rng.rng(width_);
+        int y0 = rng.rng(height_);
+        int x1 = x0;
+        int y1 = y0;
+        ASSERT_TRUE(qt_->insert(QT::BoundingBox(x0, y0, x1, y1), i));
+        ASSERT_EQ(qt_->size(), i+10001);
+    }
+}
+
+// Test that we can insert and retrieve the same element.
+TEST_F(QuadTreeTest, insert_retrieve_same)
+{
+    auto rng = NEXTPNR_NAMESPACE::DeterministicRNG();
+
+    // Add 10000 small random rectangles.
+    rng.rngseed(0);
+    for (int i = 0; i < 10000; i++) {
+        int x0 = rng.rng(width_);
+        int y0 = rng.rng(height_);
+        int w = rng.rng(width_ - x0);
+        int h = rng.rng(width_ - y0);
+        int x1 = x0 + w/4;
+        int y1 = y0 + h/4;
+        ASSERT_TRUE(qt_->insert(QT::BoundingBox(x0, y0, x1, y1), i));
+    }
+
+    // Restart RNG, make sure we get the same rectangles back.
+    rng.rngseed(0);
+    for (int i = 0; i < 10000; i++) {
+        int x0 = rng.rng(width_);
+        int y0 = rng.rng(height_);
+        int w = rng.rng(width_ - x0);
+        int h = rng.rng(width_ - y0);
+        int x1 = x0 + w/4;
+        int y1 = y0 + h/4;
+
+        // try to find something in the middle of the square
+        int x = (x1-x0)/2+x0;
+        int y = (y1-y0)/2+y0;
+
+        auto res = qt_->get(x, y);
+        // Somewhat arbirary test to make sure we don't return obscene
+        // amounts of data.
+        ASSERT_LT(res.size(), 200);
+        bool found = false;
+        for (auto elem : res) {
+            // Is this what we're looking for?
+            if (elem == i) {
+                found = true;
+                break;
+            }
+        }
+        ASSERT_TRUE(found);
+    }
+}