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new camera paradigm

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This commit is contained in:
Josh Deprez 2021-08-10 14:56:01 +10:00
parent ed61e27440
commit 88fa4f5a6e
2 changed files with 18 additions and 30 deletions
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31
engine/camera.go
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@ -8,15 +8,21 @@ import (
type Camera struct { type Camera struct {
ID ID
Scene *Scene Scene *Scene
Transform GeoMDef
// camera controls
Zoom float64
Centre image.Point
game *Game game *Game
// TODO: camera constraints // TODO: camera constraints
} }
func (c *Camera) Draw(screen *ebiten.Image, geom ebiten.GeoM) { func (c *Camera) Draw(screen *ebiten.Image, geom ebiten.GeoM) {
geom.Concat(*c.Transform.GeoM()) //geom.Concat(*c.Transform.GeoM())
scx, scy := float64(c.game.ScreenWidth/2), float64(c.game.ScreenHeight/2)
geom.Translate((scx/c.Zoom - float64(c.Centre.X)), (scy/c.Zoom - float64(c.Centre.Y)))
geom.Scale(c.Zoom, c.Zoom)
c.Scene.Draw(screen, geom) c.Scene.Draw(screen, geom)
} }
@ -24,18 +30,9 @@ func (c *Camera) Update() error { return c.Scene.Update() }
func (c *Camera) Scan() []interface{} { return []interface{}{c.Scene} } 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. if c.Zoom == 0 {
func (c *Camera) Centre(p image.Point) { c.Zoom = 1
// Currently the centre of the screen c is A^-1.c in world coordinates }
// So it is off by (p - A^-1.c)
t := c.Transform.GeoM()
t.Invert()
wcx, wcy := t.Apply(float64(c.game.ScreenWidth/2), float64(c.game.ScreenHeight/2))
t.Translate(float64(p.X)-wcx, float64(p.Y)-wcy)
t.Invert()
} }
// Zoom scales the existing camera transform by f along both X and Y.
func (c *Camera) Zoom(f float64) { c.Transform.GeoM().Scale(f, f) }

17
game/aw.go
View file

@ -67,22 +67,13 @@ func (aw *Awakeman) Update() error {
aw.SetAnim(aw.animIdleLeft) aw.SetAnim(aw.animIdleLeft)
} }
} }
zc := false aw.camera.Zoom = 1
if inpututil.IsKeyJustPressed(ebiten.KeyShift) { if ebiten.IsKeyPressed(ebiten.KeyShift) {
aw.camera.Zoom(2) aw.camera.Zoom = 2
zc = true
} }
if inpututil.IsKeyJustReleased(ebiten.KeyShift) {
aw.camera.Zoom(0.5)
zc = true
}
p := aw.Pos
aw.MoveX(aw.vx, func() { aw.vx = -aw.vx * bounceDampen }) aw.MoveX(aw.vx, func() { aw.vx = -aw.vx * bounceDampen })
aw.MoveY(aw.vy, func() { aw.vy = -aw.vy * bounceDampen }) aw.MoveY(aw.vy, func() { aw.vy = -aw.vy * bounceDampen })
if zc || aw.Pos != p { aw.camera.Centre = aw.Pos.Add(aw.Size.Div(2))
aw.camera.Centre(aw.Pos.Add(aw.Size.Div(2)))
}
return aw.Sprite.Update() return aw.Sprite.Update()
} }