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camera tweaks

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This commit is contained in:
Josh Deprez 2021-08-09 15:00:25 +10:00
parent a6508de705
commit ed61e27440
1 changed files with 4 additions and 4 deletions
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8
engine/camera.go
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@ -12,6 +12,7 @@ type Camera struct {
Transform GeoMDef Transform GeoMDef
game *Game game *Game
// TODO: camera constraints
} }
func (c *Camera) Draw(screen *ebiten.Image, geom ebiten.GeoM) { func (c *Camera) Draw(screen *ebiten.Image, geom ebiten.GeoM) {
@ -25,6 +26,7 @@ func (c *Camera) Scan() []interface{} { return []interface{}{c.Scene} }
func (c *Camera) Prepare(game *Game) { c.game = game } func (c *Camera) Prepare(game *Game) { c.game = game }
// Centre centres the camera on a world coordinate.
func (c *Camera) Centre(p image.Point) { func (c *Camera) Centre(p image.Point) {
// Currently the centre of the screen c is A^-1.c in world coordinates // Currently the centre of the screen c is A^-1.c in world coordinates
// So it is off by (p - A^-1.c) // So it is off by (p - A^-1.c)
@ -35,7 +37,5 @@ func (c *Camera) Centre(p image.Point) {
t.Invert() t.Invert()
} }
func (c *Camera) Zoom(f float64) { // Zoom scales the existing camera transform by f along both X and Y.
t := c.Transform.GeoM() func (c *Camera) Zoom(f float64) { c.Transform.GeoM().Scale(f, f) }
t.Scale(f, f)
}