Hi - I've made a scene manager and I'm running into an issue where after the transition, some sprites are not being marked dirty properly and are leaving some artifacts behind. Not sure if this is intended behavior, or some sort of bug. I've made a smaller demo code snippet that reproduces the bug. It consists of a single square sprite that you press "right" on the d-pad to move to the right. The expected behavior occurs when you first boot the example, where the square moves to the right leaving nothing behind. Pressing "A" will create a wipe scene transition, and after the transition finishes, and you move the square, it leaves an artifact behind. Highlighting screen updates shows a discrepancy where originally there was a screen update at the starting location of the sprite, but after the transition, there isn't an update. Forcing a screen update at that position removes the artifact as expected. I'm not too sure what the issue is, but a possible guess is it has something to do with creating a sprite behind another sprite?
import "CoreLibs/graphics" import "CoreLibs/sprites" import "CoreLibs/timer" local pd <const> = playdate local gfx <const> = playdate.graphics local squareImage = gfx.image.new(30, 30, gfx.kColorBlack) local squareSprite = gfx.sprite.new(squareImage) squareSprite:add() squareSprite:moveTo(20, 120) function wipeTransition(startValue, endValue) local filledRect = gfx.image.new(400, 240, gfx.kColorBlack) local transitionSprite = gfx.sprite.new(filledRect) transitionSprite:setClipRect(0, 0, 400, 240) transitionSprite:moveTo(200, 120) transitionSprite:setClipRect(0, 0, startValue, 240) transitionSprite:add() local transitionTimer = pd.timer.new(1000, startValue, endValue, pd.easingFunctions.inOutCubic) transitionTimer.updateCallback = function(timer) transitionSprite:setClipRect(0, 0, timer.value, 240) end return transitionTimer end function transition() local transitionTimer = wipeTransition(0, 400) transitionTimer.timerEndedCallback = function() gfx.sprite.removeAll() squareSprite:add() squareSprite:moveTo(20, 120) transitionTimer = wipeTransition(400, 0) end end function pd.update() if pd.buttonJustPressed(pd.kButtonRight) then squareSprite:moveBy(50, 0) end if pd.buttonJustPressed(pd.kButtonA) then transition() end gfx.sprite.update() pd.timer.updateTimers() end