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82 lines
2.0 KiB
Lua
82 lines
2.0 KiB
Lua
-- sample for termfx
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-- Gunnar Zötl <gz@tset.de>, 2014-2015
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-- Released under the terms of the MIT license. See file LICENSE for details.
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tfx = require "termfx"
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tfx.init()
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function makespr(s, fg, bg)
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local c = "-:+=%ZXH#"
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local spr = tfx.newbuffer(s, s/2)
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spr:attributes(fg, bg)
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for y=1, s/2 do
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for x=1, s do
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local lx, ly = (x-0.5)/s, (2*y-1)/s
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local v = math.floor((math.sin(lx*math.pi) + math.sin(ly*math.pi)) / 2 * #c)
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local ch = string.sub(c, v, v)
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spr:setcell(x, y, ch)
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end
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end
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return spr
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end
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tfx.outputmode(tfx.output.NORMAL)
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ok, err = pcall(function()
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local sprites = {}
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local blit2screen = true
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for i=1, 5 do
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sprites[i] = makespr(2^(i+2), i+1, tfx.color.BLACK)
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end
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local snum = 1
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local spr = sprites[snum]
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local sw, sh = spr:width(), spr:height()
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local x, y = 1-sw, 1-sh
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local xo, yo = 1, 1
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local fw, fh = tfx.width(), tfx.height()
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local target = tfx.newbuffer(fw - 2, fh - 2)
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local w, h = target:width(), target:height()
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repeat
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if blit2screen then
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tfx.clear(tfx.color.WHITE, tfx.color.BLACK)
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tfx.blit(x, y, spr)
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else
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tfx.clear(tfx.color.WHITE, tfx.color.RED)
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target:clear(tfx.color.WHITE, tfx.color.BLACK)
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target:blit(x, y, spr)
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tfx.blit(2, 2, target)
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end
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x = x + xo
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if x > w or x < 1-sw then xo = -xo end
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y = y + yo
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if y > h or y < 1-sh then yo = -yo end
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tfx.printat(1, tfx.height(), "print 1.."..#sprites.." for sprite size, t to toggle blit to screen or buffer, q to quit")
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tfx.printat(1, 1, "Current size: "..snum.." ("..spr:width().."x"..spr:height()..")")
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tfx.present()
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evt = tfx.pollevent(333)
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snum = evt and tonumber(evt.char) or snum
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if snum >= 1 and snum <= #sprites then
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spr = sprites[snum]
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sw, sh = spr:width(), spr:height()
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if x < 1-sw then x = 1-sw xo = 1 end
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if y < 1-sh then y = 1-sh yo = 1 end
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end
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if evt and evt.char == 't' then
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blit2screen = not blit2screen
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end
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until evt and evt.type == "key" and evt.char == "q"
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end)
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tfx.shutdown()
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if not ok then print("Error: "..err) end
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