fix #434: Round mouse pointer position

Closes #434

Author: adazem009

src/engine/internal/engine.cpp

@@ -778,7 +778,7 @@ double Engine::mouseX() const
 
 void Engine::setMouseX(double x)
 {
-    m_mouseX = x;
+    m_mouseX = std::round(x);
 }
 
 double Engine::mouseY() const
@@ -788,7 +788,7 @@ double Engine::mouseY() const
 
 void Engine::setMouseY(double y)
 {
-    m_mouseY = y;
+    m_mouseY = std::round(y);
 }
 
 bool Engine::mousePressed() const

test/engine/engine_test.cpp

@@ -827,16 +827,22 @@ TEST(EngineTest, MouseX)
     ASSERT_EQ(engine.mouseX(), 0);
 
     engine.setMouseX(-128.038);
-    ASSERT_EQ(engine.mouseX(), -128.038);
+    ASSERT_EQ(engine.mouseX(), -128);
+
+    engine.setMouseX(35.7);
+    ASSERT_EQ(engine.mouseX(), 36);
 }
 
 TEST(EngineTest, MouseY)
 {
     Engine engine;
     ASSERT_EQ(engine.mouseY(), 0);
 
-    engine.setMouseY(179.9258);
-    ASSERT_EQ(engine.mouseY(), 179.9258);
+    engine.setMouseY(179.1258);
+    ASSERT_EQ(engine.mouseY(), 179);
+
+    engine.setMouseY(-12.98);
+    ASSERT_EQ(engine.mouseY(), -13);
 }
 
 TEST(EngineTest, MousePressed)