Joseph Ferano
a4c6b996ff
The trio the author decided on 2026-09-20 is now all built: def is CL's defparameter — its initialiser runs on every daemon re-run, unguarded, so an edited initialiser repaints the same storage on C-c C-c plus re-run — defonce (Clojure's name for CL's defvar, per the author) initialises once behind the .init~once. flag, and defconst stays the image. One parse arm reads both forms; the difference is Ast.reinit, carried to Tast.global's grerun. Emit.startup_plan gives a def no guard flag, and Check.check_global lifts every def initialiser — zero and literal included — into global/<n>, so the host's startup reaches it through the function cell and a re-evaluated def swaps it (Session's def_inits; Emit.redefinition declares the cell for a non-sibling target). The old defvar spelling is refused with the rename and both compiling spellings, and every program, test, doc and editor list is swept — except sand.flan, the author's live WIP, whose seven defvar lines are flagged in FIX.org and keep its three dependent tests red on this branch.
61 lines
2.5 KiB
Plaintext
61 lines
2.5 KiB
Plaintext
;;;; raylib [core] example - input mouse
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;;;;
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;;;; examples/core/core_input_mouse.c. Needed three new bindings — show-cursor,
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;;;; hide-cursor and cursor-hidden? — which are now in vendor/raylib.
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;;;;
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;;;; The C's `else if` chain over the seven mouse buttons is a `cond` here.
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;;;; That is not a workaround: `cond` is what Flan has and it is the same
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;;;; first-match-wins shape, with `:else` where C falls off the end. The order
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;;;; matters in both — two buttons pressed on the same frame give the earlier
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;;;; one, which is the C's behaviour and not an accident of the port.
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;;;;
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;;;; The colour has to be a `defonce` rather than a `let`, for the reason
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;;;; core-input-keys' position does: it is state between frames.
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(import rl "vendor:raylib")
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(defconst screen-width 800)
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(defconst screen-height 450)
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(defonce ball-color rl/Color)
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(defn main [] ()
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(rl/init-window screen-width screen-height
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"raylib [core] example - input mouse")
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(defer (rl/close-window))
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;; The C also initialises the ball's POSITION, to {-100,-100} so it starts
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;; off-screen. That is dead there and is not here: the first thing the loop
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;; does is overwrite it with get-mouse-position, before anything is drawn.
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(set ball-color rl/darkblue)
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(rl/set-target-fps 60)
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(until (rl/window-should-close?)
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;; Update
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(when (rl/key-pressed? :key-h)
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(if (rl/cursor-hidden?) (rl/show-cursor) (rl/hide-cursor)))
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(let [ball (rl/get-mouse-position)]
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(set ball-color
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(cond
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(rl/mouse-button-pressed? :mouse-left) rl/maroon
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(rl/mouse-button-pressed? :mouse-middle) rl/lime
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(rl/mouse-button-pressed? :mouse-right) rl/darkblue
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(rl/mouse-button-pressed? :mouse-side) rl/purple
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(rl/mouse-button-pressed? :mouse-extra) rl/yellow
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(rl/mouse-button-pressed? :mouse-forward) rl/orange
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(rl/mouse-button-pressed? :mouse-back) rl/beige
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:else ball-color))
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;; Draw
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(rl/with-drawing
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(rl/clear-background rl/raywhite)
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(rl/draw-circle-v ball 40.0 ball-color)
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(rl/draw-text "move ball with mouse and click mouse button to change color"
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10 10 20 rl/darkgray)
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(rl/draw-text "Press 'H' to toggle cursor visibility" 10 30 20 rl/darkgray)
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(if (rl/cursor-hidden?)
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(rl/draw-text "CURSOR HIDDEN" 20 60 20 rl/red)
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(rl/draw-text "CURSOR VISIBLE" 20 60 20 rl/lime))))))
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