kistaro/bitplane-thingie
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bitplane-thingie/bitplane-thingie.p8

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Draw in color 15 only. No UI.
2023-09-23 05:03:07 +00:00
pico-8 cartridge // http://www.pico-8.com
version 41
__lua__
-- bitplane-thingie
-- by kistaro
-- mastodon: @kistaro@dragon.style
-- matrix: @kistaro:chromaticdragon.net
--
-- dev tool for experimenting
-- with bitplanes and palettes
function _init()
cls()
-- reset bitplanes
poke(0x5f5e, 0xff)
-- enable mouse
poke(0x5f2d, 0x1)
lock palette for UI. add checkbox sprite
2023-09-23 05:19:43 +00:00
-- lock bottom 16 rows to default palette
pal({[0]=0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}, 2)
poke(0x5f5f, 0x10)
poke(0x5f7e, 0xff)
poke(0x5f7f, 0xff)
Draw in color 15 only. No UI.
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-- reset mouse position
last_segment = nil
segment = nil
was_click = false
cx, cy = 0, 0
-- reset color
plane_mask = 0xff
lock palette for UI. add checkbox sprite
2023-09-23 05:19:43 +00:00
-- experimental additive palette 1
pal({[0]=0,136,3,4,1,141,13,5,6,8,139,10,140,14,12,7}, 1)
Draw in color 15 only. No UI.
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end
function _update60()
restore_under_cursor()
if stat(34) & 0x1 == 0 then
-- mouse up
was_click = false
segment = nil
return
end
do not drag out of UI bar
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-- ignore drag off ui
if was_click and segment == nil then
return
end
Draw in color 15 only. No UI.
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-- mouse down
local mouse_x = stat(32)
local mouse_y = stat(33)
if mouse_y >= 112 then
if segment then
mouse_y = 111
elseif not was_click then
implement nuke button
2023-09-23 05:53:36 +00:00
handle_ui_click(mouse_x, mouse_y)
Draw in color 15 only. No UI.
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end
end
if mouse_y < 112 then
local r = 1
if segment then
local dx = mouse_x - segment[1]
local dy = mouse_y - segment[2]
r = sqrt(dx*dx+dy*dy)
end
segment = {mouse_x, mouse_y, r}
end
was_click = true
end
function _draw()
draw_ui()
draw_segment()
draw_cursor()
end
-->8
-- draw_segment
function draw_segment()
if (not segment) return
color(0xff)
poke(0x5f5e, plane_mask)
circfill(unpack(segment))
end
-->8
-- ui (and click)
function draw_ui()
poke(0x5f5e, 0xff)
Draw a box for controls
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rectfill(1, 113, 126, 126, 6)
rect(0,112,0,127,7)
rect(0,112,127,112,7)
rect(127,112,127,127,5)
rect(0,127,127,127,5)
draw but do not handle ui
2023-09-23 05:49:34 +00:00
-- draw "nuke" button
spr(21,0,112,2,2)
print("clr", 19, 118, 1)
print("clr", 18, 117, 7)
-- draw "color" bits
for i=0,3 do
fix reversed color and mask
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draw_ui_checkbox(32 + 9*i, plane_mask & 1<<(i+4) ~= 0,i)
draw but do not handle ui
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end
print("mask", 73, 118, 1)
print("mask", 72, 117, 7)
-- draw "mask" bits
for i=0,3 do
fix reversed color and mask
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draw_ui_checkbox(90 + 9*i, plane_mask & 1<<i ~= 0, i)
draw but do not handle ui
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end
end
function draw_ui_checkbox(x, checked, n)
spr(checked and 18 or 17,
x,
113)
spr(33+n, x, 121)
Draw in color 15 only. No UI.
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end
function handle_ui_click(x, y)
implement nuke button
2023-09-23 05:53:36 +00:00
-- out of range
if (x < 3 or x > 125) return
-- nuke button
if x <= 12 and y > 114 and y < 125 then
cls()
return
end
checkboxes work, might be labeled backwards
2023-09-23 06:10:30 +00:00
-- checkboxes: qualify
if (y < 113 or y > 120 or x < 32) return
if x <= 67 then
x -= 32
if (x % 9 == 8) return
local box = x \ 9
--check range
if (box < 0 or box > 3) return
fix reversed color and mask
2023-09-23 06:12:36 +00:00
toggle_mask_bit(box+4)
checkboxes work, might be labeled backwards
2023-09-23 06:10:30 +00:00
return
end
x -= 90
if (x % 9 == 8) return
local box = x \ 9
--check range
if (box < 0 or box > 3) return
fix reversed color and mask
2023-09-23 06:12:36 +00:00
toggle_mask_bit(box)
checkboxes work, might be labeled backwards
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return
end
function toggle_mask_bit(n)
local sel = 1 << n
local b = plane_mask & sel
plane_mask = plane_mask & ~sel
if (b > 0) return
plane_mask = plane_mask | sel
Draw in color 15 only. No UI.
2023-09-23 05:03:07 +00:00
end
-->8
-- draw_cursor
function draw_cursor()
cx, cy = stat(32), stat(33)
-- save blob under cursor to
-- corner of sprite sheet
-- to restore on next frame
poke(0x5f54, 0x60)
poke(0x5f55, 0x00)
palt(0, false)
sspr(cx, cy, 8, 8, 120, 24)
palt(0, true)
poke(0x5f54, 0x00)
poke(0x5f55, 0x60)
spr(stat(34)+1, cx, cy)
end
function restore_under_cursor()
palt(0, false)
sspr(120, 24, 8, 8, cx, cy)
palt(0, true)
end
__gfx__
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lock palette for UI. add checkbox sprite
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draw but do not handle ui
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add label image
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__label__
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