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call it pf

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This commit is contained in:
Josh Deprez 2021-08-18 17:44:03 +10:00
parent 88482c390d
commit f01b667a0d
1 changed files with 5 additions and 5 deletions
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10
engine/camera.go
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@ -74,7 +74,7 @@ func (c *Camera) Draw(screen *ebiten.Image, opts ebiten.DrawImageOptions) {
// Apply other options
opts.Filter = c.Filter
// Compute common matrix (parts independent of CoordScale).
// Compute common matrix (parts independent of parallax).
// Moving centre to the origin happens per component.
var comm ebiten.GeoM
// 2. Zoom (this is also where rotation would be)
@ -87,13 +87,13 @@ func (c *Camera) Draw(screen *ebiten.Image, opts ebiten.DrawImageOptions) {
// Draw everything.
for _, i := range c.Scene.Components {
if d, ok := i.(Drawer); ok {
cs := 1.0
pf := 1.0
if s, ok := i.(ParallaxScaler); ok {
cs = s.ParallaxFactor()
pf = s.ParallaxFactor()
}
var geom ebiten.GeoM
// 1. Move centre to the origin, subject to CoordScale
geom.Translate(-float64(centre.X)*cs, -float64(centre.Y)*cs)
// 1. Move centre to the origin, subject to parallax factor
geom.Translate(-float64(centre.X)*pf, -float64(centre.Y)*pf)
geom.Concat(comm)
opts.GeoM = geom
d.Draw(screen, opts)