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implementing the iconic 'lag behind' camera the right way

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minjaesong
2019-01-22 05:46:26 +09:00
parent a6921fe924
commit e5fec2c22c
2 changed files with 13 additions and 7 deletions
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5
src/net/torvald/terrarum/modulebasegame/Ingame.kt
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@@ -505,8 +505,6 @@ open class Ingame(batch: SpriteBatch) : IngameInstance(batch) {
// camera-related updates //
////////////////////////////
FeaturesDrawer.update(delta)
WorldCamera.update(gameworld, actorNowPlaying)
///////////////////////////
@@ -529,6 +527,9 @@ open class Ingame(batch: SpriteBatch) : IngameInstance(batch) {
visibleActorsRenderMidTop = actorsRenderMidTop.filter { it.inScreen() }
visibleActorsRenderFront = actorsRenderFront.filter { it.inScreen() }
visibleActorsRenderOverlay=actorsRenderOverlay.filter { it.inScreen() }
WorldCamera.update(gameworld, actorNowPlaying)
}

15
src/net/torvald/terrarum/worlddrawer/WorldCamera.kt
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@@ -2,9 +2,10 @@ package net.torvald.terrarum.worlddrawer
import com.jme3.math.FastMath
import net.torvald.terrarum.Terrarum
import net.torvald.terrarum.gameworld.GameWorld
import net.torvald.terrarum.gameactors.ActorWBMovable
import net.torvald.terrarum.floorInt
import net.torvald.terrarum.gameactors.ActorWBMovable
import net.torvald.terrarum.gameworld.GameWorld
import org.dyn4j.geometry.Vector2
/**
* Created by minjaesong on 2016-12-30.
@@ -29,6 +30,8 @@ object WorldCamera {
inline val yCentre: Int
get() = y + height.ushr(1)
private val nullVec = Vector2(0.0, 0.0)
fun update(world: GameWorld, player: ActorWBMovable?) {
if (player == null) return
@@ -38,12 +41,14 @@ object WorldCamera {
// TOP-LEFT position of camera border
// some hacky equation to position player at the dead centre
// NOT tested for WorldDrawer sampling negative coord for its drawing (which causes some fucking artefacts)
x = ((player.hitbox.centeredX).toFloat() - (width / 2)).floorInt() // X only: ROUNDWORLD implementation
// implementing the "lag behind" camera the right way
val pVecSum = player.externalV + (player.controllerV ?: nullVec)
x = ((player.hitbox.centeredX - pVecSum.x).toFloat() - (width / 2)).floorInt() // X only: ROUNDWORLD implementation
y = (FastMath.clamp(
player.hitbox.centeredY.toFloat() - height / 2,
(player.hitbox.centeredY - pVecSum.y).toFloat() - height / 2,
TILE_SIZE.toFloat(),
world.height * TILE_SIZE - height - TILE_SIZE.toFloat()
)).floorInt().clampCameraY(world)