func (s *State) Visible(sprite *twodee.Sprite) bool {
var (
wb = s.window.View.Sub(s.env.Bounds().Min)
sb = sprite.RelativeBounds(s.env)
buffer = float32(256)
)
wb.Min.X -= buffer
wb.Min.Y -= buffer
wb.Max.X += buffer
wb.Max.X += buffer
return sb.Overlaps(wb)
}
func (s *State) UpdateSprite(sprite *twodee.Sprite, ms float32) (result int) {
sprite.VelocityY += 0.005 * ms // Gravity
var (
dX = sprite.VelocityX * ms
dY = sprite.VelocityY * ms
b = sprite.RelativeBounds(s.env)
)
if b.Min.X+dX < 0 {
result |= HITLEFT
sprite.VelocityX = 0
sprite.Move(twodee.Pt(1, 0))
dX = 0
}
if b.Max.X+dX > s.env.Width() {
/*
fmt.Printf("HITRIGHT\n")
fmt.Printf("sprite.RelativeBounds(s.env) %v\n", sprite.RelativeBounds(s.env))
fmt.Printf("sprite.LocalBounds() %v\n", sprite.Bounds())
*/
result |= HITRIGHT
sprite.VelocityX = 0
sprite.Move(twodee.Pt(-1, 0))
dX = 0
}
if sprite.Collide {
for _, block := range s.boundaries {
if dX != 0 && !sprite.TestMove(dX, 0, block) {
if sprite.TestMove(dX, -block.Height(), block) {
// Allows running up small bumps
sprite.Move(twodee.Pt(0, -block.Height()))
} else {
if dX < 0 {
sprite.MoveTo(twodee.Pt(block.X()+block.Width(), sprite.Y()))
result |= HITLEFT
} else {
sprite.MoveTo(twodee.Pt(block.X()-sprite.Width(), sprite.Y()))
result |= HITRIGHT
}
sprite.VelocityX = 0
dX = 0
}
}
if dY != 0 && !sprite.TestMove(0, dY, block) {
if dY < 0 {
sprite.MoveTo(twodee.Pt(sprite.X(), block.Y()+block.Height()))
result |= HITTOP
} else {
sprite.MoveTo(twodee.Pt(sprite.X(), block.Y()-sprite.Height()))
result |= HITBOTTOM
}
sprite.VelocityY = 0
dY = 0
}
}
}
if dX != 0 || dY != 0 {
sprite.Move(twodee.Pt(dX, dY))
}
//sprite.MoveTo(twodee.Pt(Round(sprite.X()), Round(sprite.Y())))
return
}