phase
Input
phase Input
Input is the first phase of every frame. The runtime polls the keyboard just before it runs, so a handler … phase Input reads the current key with Input.key() and turns it into intent — a chosen direction, a menu selection, a pause toggle — usually by writing a program var that later phases act on. Keep it to reading input and recording decisions: do the actual movement and simulation in FixedUpdate/Update, and the drawing in Render. Because it runs before FixedUpdate, Update, LateUpdate, and Render, the intent it records is visible to every phase in the same frame.
Example
program InputExample {
const DIRECTION_LEFT: int = 0
const DIRECTION_RIGHT: int = 1
var facing: int = DIRECTION_RIGHT
handler ReadControls phase Input {
let pressed_key = Input.key()
if pressed_key == 'a' { facing = DIRECTION_LEFT }
if pressed_key == 'd' { facing = DIRECTION_RIGHT }
}
handler DrawWorld phase Render {
Screen.clear(Color.MidnightBlue)
var marker_x = 40
if facing == DIRECTION_RIGHT { marker_x = 200 }
Screen.fill_rectangle(x: marker_x, y: 100, width: 16, height: 16, color: Color.LimeGreen)
Screen.show()
}
}