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// paintui handles turning sdl input things
// into drawing instructions
// it might have some kind of state machine
// for doing smooth lines between discrete mouse positions
// all mouse pos stuff in this module is in world coordinates
// someone else is responsible for doing the transform from
// screen to world coords.
use drawing;
use drawing::{pos};
export type state = struct {
// last known mouse position, in world coordinates
last_mouse_pos: pos,
// last known mouse pressed-ness
last_mouse_pressed: bool
};
export fn tick(
pstate: *state,
mouse_pos: pos, mouse_pressed: bool
) (void | drawing::op) = {
defer {
pstate.last_mouse_pos = mouse_pos;
pstate.last_mouse_pressed = mouse_pressed;
};
// if mouse down and (position moved OR newly pressed)
return if (mouse_pressed
&& (mouse_pos.0 != pstate.last_mouse_pos.0
|| mouse_pos.1 != pstate.last_mouse_pos.1
|| (!pstate.last_mouse_pressed)))
mouse_pos: drawing::op_circle
else void;
};
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