giant refactor, start to use drawing ops for drawing

1 files changed, 38 insertions, 0 deletions

diff --git a/client/paintui/paintui.ha b/client/paintui/paintui.ha
new file mode 100644
index 0000000..ce55bb7
--- /dev/null
+++ b/client/paintui/paintui.ha
@@ -0,0 +1,38 @@
+// 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;
+};
+