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Simplified user input handling

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This commit is contained in:
Igor Chevdar
2017-03-15 12:48:58 +03:00
parent d21d444f58
commit 3cf844d589
1 changed files with 8 additions and 58 deletions
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samples/tetris/tetris.kt
+8 -58
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@@ -773,73 +773,23 @@ class SDL_Visualizer(val width: Int, val height: Int): GameFieldVisualizer, User
} }
} }
private val LEFT_PRESSED = 1
private val RIGHT_PRESSED = 2
private val DOWN_PRESSED = 4
private val UP_PRESSED = 8
private val Z_PRESSED = 16
private val ESC_PRESSED = 32
private var pressedKeys = 0
private var stickedKeys = 0
private fun keyToCommand(key: Int): UserCommand? =
when (key) {
LEFT_PRESSED -> (UserCommand.LEFT)
RIGHT_PRESSED -> (UserCommand.RIGHT)
DOWN_PRESSED -> (UserCommand.DOWN)
Z_PRESSED -> (UserCommand.ROTATE)
UP_PRESSED -> (UserCommand.RELEASE)
ESC_PRESSED -> (UserCommand.EXIT)
else -> null
}
override fun readCommands(): List<UserCommand> { override fun readCommands(): List<UserCommand> {
val commands = mutableListOf<UserCommand>() val commands = mutableListOf<UserCommand>()
memScoped { memScoped {
val event = alloc<SDL_Event>() val event = alloc<SDL_Event>()
var currentCommands = 0
while (SDL_PollEvent(event.ptr.reinterpret()) != 0) { while (SDL_PollEvent(event.ptr.reinterpret()) != 0) {
if (event.type.value == SDL_KEYDOWN if (event.type.value == SDL_KEYDOWN) {
|| event.type.value == SDL_KEYUP) {
val keyboardEvent = event.ptr.reinterpret<SDL_KeyboardEvent>().pointed val keyboardEvent = event.ptr.reinterpret<SDL_KeyboardEvent>().pointed
val scancode = when (keyboardEvent.keysym.scancode.value) { when (keyboardEvent.keysym.scancode.value) {
SDL_SCANCODE_LEFT -> LEFT_PRESSED SDL_SCANCODE_LEFT -> commands.add(UserCommand.LEFT)
SDL_SCANCODE_RIGHT -> RIGHT_PRESSED SDL_SCANCODE_RIGHT -> commands.add(UserCommand.RIGHT)
SDL_SCANCODE_DOWN -> DOWN_PRESSED SDL_SCANCODE_DOWN -> commands.add(UserCommand.DOWN)
SDL_SCANCODE_Z -> Z_PRESSED SDL_SCANCODE_Z -> commands.add(UserCommand.ROTATE)
SDL_SCANCODE_UP -> UP_PRESSED SDL_SCANCODE_UP -> commands.add(UserCommand.RELEASE)
SDL_SCANCODE_ESCAPE -> ESC_PRESSED SDL_SCANCODE_ESCAPE -> commands.add(UserCommand.EXIT)
else -> 0
}
if (keyboardEvent.state.value.toInt() == SDL_PRESSED) {
if (pressedKeys and scancode != 0) {
// DAS - delayed auto shift: https://tetris.wiki/DAS
stickedKeys = stickedKeys or scancode
}
currentCommands = currentCommands or scancode
pressedKeys = pressedKeys or scancode
}
else if (keyboardEvent.state.value.toInt() == SDL_RELEASED) {
pressedKeys = pressedKeys and scancode.inv()
stickedKeys = stickedKeys and scancode.inv()
} }
} }
} }
currentCommands = currentCommands or stickedKeys
var temp = currentCommands
while (temp != 0) {
val next = temp and (temp - 1)
val curKey = temp - next
when (curKey) {
LEFT_PRESSED -> commands.add(UserCommand.LEFT)
RIGHT_PRESSED -> commands.add(UserCommand.RIGHT)
DOWN_PRESSED -> commands.add(UserCommand.DOWN)
Z_PRESSED -> commands.add(UserCommand.ROTATE)
UP_PRESSED -> commands.add(UserCommand.RELEASE)
ESC_PRESSED -> commands.add(UserCommand.EXIT)
}
temp = next
}
} }
return commands return commands
} }