public void Check_StopsObject_EvenIfItIsMovingLessThanOnePixel()
{
var map = CollisionMap.Empty;
map.TileSize = 16;
map.MapData.Width = 4;
// create a fake map
// 0, 0, 0, 0,
// 0, -1, -1, 0,
// 0, -1, -1, 0,
// 0, 0, 0, 0
map.MapData[0] = 0; map.MapData[1] = 0; map.MapData[2] = 0; map.MapData[3] = 0;
map.MapData[4] = 0; map.MapData[5] = -1; map.MapData[6] = -1; map.MapData[7] = 0;
map.MapData[8] = 0; map.MapData[9] = -1; map.MapData[10] = -1; map.MapData[11] = 0;
map.MapData[12] = 0; map.MapData[13] = 0; map.MapData[14] = 0; map.MapData[15] = 0;
var detector = new CollisionDetector(map);
// now, simulate a collision where the entity wants to travel 0.32000000023f on X and 4.8f on Y
var result = detector.Check(new Vector2(16, 16), new Vector2(-0.3200000023f, 4.8f), new Vector2(64, 64));
// X position should be pushed back (entity was in a bad spot before)
Assert.Equal(16f, result.Position.X);
// Y should increase as expected
Assert.Equal(20.8f, result.Position.Y);
}
public void Check_DecrementsYaxis_IfNoCollisions()
{
var detector = new CollisionDetector(CollisionMap.Empty);
var result = detector.Check(_startPosition, new Vector2(0, -2), _size);
Assert.Equal(100f, result.Position.X);
Assert.Equal(98f, result.Position.Y);
}
public void Check_IncrementsYaxis_IfNoCollisions()
{
var detector = new CollisionDetector(CollisionMap.Empty);
var result = detector.Check(_startPosition, _smallVelocity, _size);
Assert.Equal(105f, result.Position.X);
Assert.Equal(105f, result.Position.Y);
}
public void Check_StopsObject_AtCollisionPoint()
{
// fake a collision along our path
var map = CollisionMap.Empty;
map.TileSize = 16;
map.MapData[1] = 1;
var detector = new CollisionDetector(map);
var result = detector.Check(Vector2.Zero, new Vector2(32, 0), new Vector2(8, 8));
Assert.Equal(8, result.Position.X);
Assert.Equal(0, result.Position.Y);
}
public void Test_Collision_Edge_Cases()
{
//{X:0 Y:78.4279}
//{X:-20 Y:88.2359}
//False
//{X:-0.32 Y:1.411775}
//{X:64 Y:252.6814}
var map = CollisionMap.Empty;
map.TileSize = 16;
map.MapData.Width = 4;
// create a fake map
// 0, 0, 0, 0,
// 0, -1, -1, 0,
// 0, -1, -1, 0,
// 0, 0, 0, 0
map.MapData[0] = 0; map.MapData[1] = 0; map.MapData[2] = 0; map.MapData[3] = 0;
map.MapData[4] = 0; map.MapData[5] = -1; map.MapData[6] = -1; map.MapData[7] = 0;
map.MapData[8] = 0; map.MapData[9] = -1; map.MapData[10] = -1; map.MapData[11] = 0;
map.MapData[12] = 0; map.MapData[13] = -1; map.MapData[14] = -1; map.MapData[15] = 0;
map.MapData[16] = 0; map.MapData[17] = -1; map.MapData[18] = -1; map.MapData[19] = 0;
map.MapData[20] = 0; map.MapData[21] = -1; map.MapData[22] = -1; map.MapData[23] = 0;
map.MapData[24] = 0; map.MapData[25] = -1; map.MapData[26] = -1; map.MapData[27] = 0;
map.MapData[28] = 0; map.MapData[29] = -1; map.MapData[30] = -1; map.MapData[31] = 0;
map.MapData[32] = 0; map.MapData[33] = 0; map.MapData[34] = 0; map.MapData[35] = 0;
var detector = new CollisionDetector(map);
// now, simulate a collision where the entity wants to travel 0.32000000023f on X and 4.8f on Y
var result = detector.Check(new Vector2(16, 16), new Vector2(-0.3200000023f, 1.411775f), new Vector2(16, 16));
result.XAxis.ShouldBeTrue("No XAxis Collision Reported");
result.Position.X.ShouldEqual(16f); // no movement on X
}