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samples_lua.lua
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samples_lua.lua
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#!/usr/bin/lua
dofile "libtcodlua.lua"
SAMPLE_SCREEN_WIDTH = 46
SAMPLE_SCREEN_HEIGHT = 20
SAMPLE_SCREEN_X = 20
SAMPLE_SCREEN_Y = 10
tcod.console.setCustomFont("data/fonts/consolas10x10_gs_tc.png", tcod.Greyscale + tcod.LayoutTCOD)
tcod.console.initRoot(80,50,"libtcod lua sample", false, tcod.SDL)
root=libtcod.TCODConsole_root
sampleConsole = tcod.Console(SAMPLE_SCREEN_WIDTH, SAMPLE_SCREEN_HEIGHT)
first=true
rng=tcod.random.getInstance()
-- ******************************
-- True colors sample (benchmark)
-- ******************************
TOPLEFT = 1
TOPRIGHT = 2
BOTTOMLEFT = 3
BOTTOMRIGHT = 4
-- random starting colors for corners
cols={ tcod.Color(50,40,150),
tcod.Color(240,85,5),
tcod.Color(50,35,240),
tcod.Color(10,200,130) }
dirr={1,-1,1,1}
dirg={1,-1,-1,1}
dirb={1,1,1,-1}
function render_colors(key)
if first then
tcod.system.setFps(0) -- unlimited fps
sampleConsole:clear()
end
-- ==== slighty modify the corner colors ====
for c=1,4,1 do
-- move each corner color
local component=rng:getInt(0,2)
if component == 0 then
cols[c].Red = cols[c].Red + 5*dirr[c]
if cols[c].Red == 255 then dirr[c]=-1
elseif cols[c].Red==0 then dirr[c]=1
end
elseif component == 1 then
cols[c].Green = cols[c].Green + 5*dirg[c]
if cols[c].Green == 255 then dirg[c]=-1
elseif cols[c].Green==0 then dirg[c]=1
end
elseif component == 2 then
cols[c].Blue = cols[c].Blue + 5*dirb[c]
if cols[c].Blue == 255 then dirb[c]=-1
elseif cols[c].Blue==0 then dirb[c]=1
end
end
end
-- ==== scan the whole screen, interpolating corner colors ====
for x=0,SAMPLE_SCREEN_WIDTH-1,1 do
local xcoef = x/(SAMPLE_SCREEN_WIDTH-1)
-- get the current column top and bottom colors
local top = tcod.color.Interpolate(cols[TOPLEFT], cols[TOPRIGHT],xcoef)
local bottom = tcod.color.Interpolate(cols[BOTTOMLEFT], cols[BOTTOMRIGHT],xcoef)
for y=0,SAMPLE_SCREEN_HEIGHT-1,1 do
local ycoef = y/(SAMPLE_SCREEN_HEIGHT-1)
-- get the current cell color
local curColor = tcod.color.Interpolate(top,bottom,ycoef)
sampleConsole:setCharBackground(x,y,curColor,tcod.Set)
end
end
-- ==== print the text with a random color ====
-- get the background color at the text position
local textColor=sampleConsole:getCharBackground(SAMPLE_SCREEN_WIDTH/2,5)
-- and invert it
textColor.Red=255-textColor.Red
textColor.Green=255-textColor.Green
textColor.Blue=255-textColor.Blue
-- put random text (for performance tests)
for x=0,SAMPLE_SCREEN_WIDTH-1,1 do
for y=0,SAMPLE_SCREEN_HEIGHT-1,1 do
local col=sampleConsole:getCharBackground(x,y)
col=tcod.color.Interpolate(col,tcod.color.black,0.5)
local c=rng:getInt(97,97+25) -- 97 == 'a'
sampleConsole:setDefaultForeground(col)
sampleConsole:putChar(x,y,c,tcod.None)
end
end
sampleConsole:setDefaultForeground(textColor)
-- the background behind the text is slightly darkened using the Multiply flag
sampleConsole:setDefaultBackground(tcod.color.grey)
sampleConsole:printRectEx(SAMPLE_SCREEN_WIDTH/2,5,SAMPLE_SCREEN_WIDTH-2,SAMPLE_SCREEN_HEIGHT-1,
tcod.Multiply,tcod.CenterAlignment,
"The Doryen library uses 24 bits colors, for both background and foreground.")
end
-- ***************************
-- offscreen console sample
-- ***************************
-- a console to store the background screen
screenshot = tcod.Console(SAMPLE_SCREEN_WIDTH,SAMPLE_SCREEN_HEIGHT)
-- the offscreen console to blit on top of the background
secondary = tcod.Console(SAMPLE_SCREEN_WIDTH/2,SAMPLE_SCREEN_HEIGHT/2)
off_init=false
off_counter=0
off_x=0
off_y=0
off_xdir=1
off_ydir=1
function render_offscreen(key)
if not off_init then
-- draw the offscreen console only on first frame
off_init=true
secondary:printFrame(0,0,SAMPLE_SCREEN_WIDTH/2,SAMPLE_SCREEN_HEIGHT/2,false,tcod.Set,"Offscreen console")
secondary:printRectEx(SAMPLE_SCREEN_WIDTH/4,2,SAMPLE_SCREEN_WIDTH/2-2,SAMPLE_SCREEN_HEIGHT/2,
tcod.None,tcod.CenterAlignment,"You can render to an offscreen console and blit in on another one, simulating alpha transparency.")
end
if first then
tcod.system.setFps(30) -- fps limited to 30
-- get a "screenshot" of the current sample screen
tcod.console.blit(sampleConsole,0,0,SAMPLE_SCREEN_WIDTH,SAMPLE_SCREEN_HEIGHT,
screenshot,0,0);
end
off_counter = off_counter + 1
if off_counter % 20 == 0 then
-- move the secondary screen every 2 seconds
off_x = off_x + off_xdir
off_y = off_y + off_ydir
if off_x >= SAMPLE_SCREEN_WIDTH/2+5 then off_xdir = -1
elseif off_x <= -5 then off_xdir = 1 end
if off_y >= SAMPLE_SCREEN_HEIGHT/2+5 then off_ydir = -1
elseif off_y <= -5 then off_ydir = 1 end
end
-- restore the initial screen
tcod.console.blit(screenshot,0,0,SAMPLE_SCREEN_WIDTH,SAMPLE_SCREEN_HEIGHT,
sampleConsole,0,0)
-- blit the overlapping screen
tcod.console.blit(secondary,0,0,SAMPLE_SCREEN_WIDTH/2,SAMPLE_SCREEN_HEIGHT/2,
sampleConsole,off_x,off_y,1.0,0.75)
end
-- *******************
-- Line drawing sample
-- *******************
bk = tcod.Console(SAMPLE_SCREEN_WIDTH,SAMPLE_SCREEN_HEIGHT) -- colored background
bkFlag=tcod.Set
line_init=false
flagNames={
"None",
"Set",
"Multiply",
"Lighten",
"Darken",
"Screen",
"Dodge",
"Burn",
"Add",
"AddAlpha",
"Burn",
"Overlay",
"Alpha"
}
function render_lines(key)
if key.KeyCode == tcod.Enter or key.KeyCode == tcod.KeypadEnter then
-- switch to the next blending mode
bkFlag = bkFlag+1
if bkFlag % 256 > tcod.Alpha then bkFlag=tcod.None end
end
if bkFlag % 256 == tcod.Alpha then
-- for the alpha mode, update alpha every frame
alpha = (1.0+math.cos(tcod.system.getElapsedSeconds()*2))/2.0
bkFlag=tcod.console.Alpha(alpha)
elseif bkFlag % 256 == tcod.AddAlpha then
-- for the add alpha mode, update alpha every frame
alpha = (1.0+math.cos(tcod.system.getElapsedSeconds()*2))/2.0
bkFlag=tcod.console.AddAlpha(alpha)
end
if not line_init then
-- initialize the colored background
for x=0,SAMPLE_SCREEN_WIDTH,1 do
for y=0,SAMPLE_SCREEN_HEIGHT,1 do
local col = tcod.Color(0,0,0)
col.Red = x* 255 / (SAMPLE_SCREEN_WIDTH-1)
col.Green = (x+y)* 255 / (SAMPLE_SCREEN_WIDTH-1+SAMPLE_SCREEN_HEIGHT-1)
col.Blue = y* 255 / (SAMPLE_SCREEN_HEIGHT-1)
bk:setCharBackground(x,y,col)
end
end
line_init=true
end
if first then
tcod.system.setFps(30) -- fps limited to 30
sampleConsole:setDefaultForeground(tcod.color.white)
end
-- blit the background
tcod.console.blit(bk,0,0,SAMPLE_SCREEN_WIDTH,SAMPLE_SCREEN_HEIGHT,sampleConsole,0,0)
-- render the gradient
recty=(SAMPLE_SCREEN_HEIGHT-2)*((1.0+math.cos(tcod.system.getElapsedSeconds()))/2.0)
for x=0,SAMPLE_SCREEN_WIDTH,1 do
local col = tcod.Color(0,0,0)
col.Red=x*255/SAMPLE_SCREEN_WIDTH
col.Green=x*255/SAMPLE_SCREEN_WIDTH
col.Blue=x*255/SAMPLE_SCREEN_WIDTH
sampleConsole:setCharBackground(x,recty,col,bkFlag)
sampleConsole:setCharBackground(x,recty+1,col,bkFlag)
sampleConsole:setCharBackground(x,recty+2,col,bkFlag)
end
-- calculate the segment ends
local angle = tcod.system.getElapsedSeconds()*2.0
local cosAngle=math.cos(angle)
local sinAngle=math.sin(angle)
local xo = SAMPLE_SCREEN_WIDTH/2*(1 + cosAngle)
local yo = SAMPLE_SCREEN_HEIGHT/2 + sinAngle * SAMPLE_SCREEN_WIDTH/2
local xd = SAMPLE_SCREEN_WIDTH/2*(1 - cosAngle)
local yd = SAMPLE_SCREEN_HEIGHT/2 - sinAngle * SAMPLE_SCREEN_WIDTH/2
-- render the line
tcod.line.init(xo,yo,xd,yd)
local x=xo
local y=yo
repeat
if x >= 0 and y >= 0 and x < SAMPLE_SCREEN_WIDTH and y < SAMPLE_SCREEN_HEIGHT then
sampleConsole:setCharBackground(x,y,tcod.color.lightBlue,bkFlag)
end
lineEnd,x,y=tcod.line.step(x,y)
until lineEnd
-- print the current flag
sampleConsole:print(2,2,string.format("%s (ENTER to change)",flagNames[(bkFlag%256)+1]))
end
-- ***************************
-- noise sample
-- ***************************
-- what noise to render ?
PERLIN=0
SIMPLEX=1
WAVELET=2
FBM_PERLIN=3
TURBULENCE_PERLIN=4
FBM_SIMPLEX=5
TURBULENCE_SIMPLEX=6
FBM_WAVELET=7
TURBULENCE_WAVELET=8
funcName={
"1 : perlin noise ",
"2 : simplex noise ",
"3 : wavelet noise ",
"4 : perlin fbm ",
"5 : perlin turbulence ",
"6 : simplex fbm ",
"7 : simplex turbulence ",
"8 : wavelet fbm ",
"9 : wavelet turbulence "
}
func=PERLIN
noise=nil
noise_dx=0
noise_dy=0
octaves=4
hurst=tcod.NoiseDefaultHurst
lacunarity=tcod.NoiseDefaultLacunarity
noise_img=nil
zoom=3
function render_noise(key)
if noise == nil then
noise = tcod.Noise(2,hurst,lacunarity)
img = tcod.Image(SAMPLE_SCREEN_WIDTH*2,SAMPLE_SCREEN_HEIGHT*2)
end
if first then
tcod.system.setFps(30) -- fps limited to 30
end
-- texture animation
noise_dx = noise_dx+0.01
noise_dy = noise_dy + 0.01
-- render the 2d noise function
for y=0,2*SAMPLE_SCREEN_HEIGHT-1,1 do
for x=0,2*SAMPLE_SCREEN_WIDTH-1,1 do
local f = { zoom*x / (2*SAMPLE_SCREEN_WIDTH) + noise_dx, zoom*y / (2*SAMPLE_SCREEN_HEIGHT) + noise_dy }
local value = 0
if func == PERLIN then value = noise:get(f,NoisePerlin)
elseif func == SIMPLEX then value = noise:get(f,NoiseSimplex)
elseif func == WAVELET then value = noise:get(f,NoiseWavelet)
elseif func == FBM_PERLIN then value = noise:getFbm(f,octaves,NOISE_PERLIN)
elseif func == TURBULENCE_PERLIN then value = noise:getTurbulence(f,octaves,TCOD_NOISE_PERLIN)
elseif func == FBM_SIMPLEX then value = noise:getFbm(f,octaves,NoiseSimplex)
elseif func == TURBULENCE_SIMPLEX then value = noise:getTurbulence(f,octaves,NoiseSimplex)
elseif func == FBM_WAVELET then value = noise:getFbm(f,octaves,NoiseWavelet)
elseif func == TURBULENCE_WAVELET then value = noise:getTurbulence(f,octaves,NoiseWavelet)
end
local c=math.floor((value+1.0)/2.0*255)
-- use a bluish color
local col = tcod.Color(c/2,c/2,c)
img:putPixel(x,y,col)
end
end
-- blit the noise image on the console with subcell resolution
img:blit2x(sampleConsole,0,0);
-- draw a transparent rectangle
sampleConsole:setBackgroundColor(tcod.color.grey)
local ypos=10
if func > WAVELET then ypos = 13 end
sampleConsole:rect(2,2,23,ypos,false,tcod.Multiply)
for y=2,1+ypos,1 do
for x=2,24,1 do
local col = sampleConsole:getFore(x,y)
col = col * tcod.color.grey
sampleConsole:setFore(x,y,col)
end
end
-- draw the text
for curfunc=PERLIN,TURBULENCE_WAVELET,1 do
if curfunc == func then
sampleConsole:setForegroundColor(tcod.color.white)
sampleConsole:setBackgroundColor(tcod.color.lightBlue)
sampleConsole:printEx(2,2+curfunc,tcod.Set,tcod.LeftAlignment,funcName[curfunc])
else
sampleConsole:setForegroundColor(tcod.color.grey)
sampleConsole:print(2,2+curfunc,funcName[curfunc])
end
end
-- draw parameters
sampleConsole:setForegroundColor(tcod.color.white)
sampleConsole:print(2,11,string.format("Y/H : zoom (%2.1f)",zoom))
if func > WAVELET then
sampleConsole:print(2,12,string.format("E/D : hurst (%2.1f)",hurst))
sampleConsole:print(2,13,string.format("R/F : lacunarity (%2.1f)",lacunarity))
sampleConsole:print(2,14,string.format("T/G : octaves (%2.1f)",octaves))
end
-- handle keypress
if key.KeyCode == tcod.NoKey then return end
if key.Character >= '1' and key.Character <= '9' then
-- change the noise function
func = key.Character - '1'
elseif key.Character == 'E' or key.Character == 'e' then
-- increase hurst
hurst = hurst + 0.1
noise = tcod.Noise(2,hurst,lacunarity)
elseif key.Character == 'D' or key.Character == 'd' then
-- decrease hurst
hurst = hurst - 0.1
noise = tcod.Noise(2,hurst,lacunarity)
elseif key.Character == 'R' or key.Character == 'r' then
-- increase lacunarity
lacunarity = lacunarity + 0.5
noise = tcod.Noise(2,hurst,lacunarity)
elseif key.Character == 'F' or key.Character == 'f' then
-- decrease lacunarity
lacunarity = lacunarity - 0.5
noise = tcod.Noise(2,hurst,lacunarity)
elseif key.Character == 'T' or key.Character == 't' then
-- increase octaves
octaves = octaves + 0.5
elseif key.Character == 'G' or key.Character == 'g' then
-- decrease octaves
octaves = octaves - 0.5
elseif key.Character == 'Y' or key.Character == 'y' then
-- increase zoom
zoom = zoom + 0.2
elseif key.Character == 'H' or key.Character == 'h' then
-- decrease zoom
zoom = zoom - 0.2
end
end
creditsEnd=false
-- list of samples
samples = {
{ name = " True colors ", render = render_colors },
{ name = " Offscreen console ", render = render_offscreen },
{ name = " Line drawing ", render = render_lines },
{ name = " Noise ", render = render_noise }
}
nbSamples = table.getn(samples)
curSample = 1
while not tcod.console.isWindowClosed() do
key=tcod.Key()
tcod.system.checkForEvent(29,key,nil)
-- render current sample
samples[curSample].render(key)
first=false
-- and blit it on the root console
tcod.console.blit(sampleConsole,
0, 0, SAMPLE_SCREEN_WIDTH, SAMPLE_SCREEN_HEIGHT,
root, SAMPLE_SCREEN_X, SAMPLE_SCREEN_Y)
if not creditsEnd then
creditsEnd = tcod.console.renderCredits(60, 43, false)
end
-- print the list of samples
for i=1,nbSamples,1 do
if i == curSample then
-- set colors for currently selected sample
root:setDefaultForeground(tcod.color.white)
root:setDefaultBackground(tcod.color.lightBlue)
else
-- set colors for other samples
root:setDefaultForeground(tcod.color.grey)
root:setDefaultBackground(tcod.color.black)
end
-- print the sample name
root:printEx(2,46-(nbSamples-i),tcod.Set,tcod.LeftAlignment,samples[i].name)
end
-- render stats
root:setDefaultForeground(tcod.color.grey)
root:printEx(79, 46, tcod.None, tcod.RightAlignment,
string.format("last frame : %3d ms (%3d fps)" ,
math.floor(tcod.system.getLastFrameLength() * 1000.0),
tcod.system.getFps()))
root:printEx(79, 47, tcod.None, tcod.RightAlignment,
string.format("elapsed : %8d ms %4.2fs",
tcod.system.getElapsedMilli(),
tcod.system.getElapsedSeconds()))
tcod.console.flush()
if key.KeyCode == tcod.Down then
-- down arrow : next sample
curSample = (curSample+1)
if curSample == nbSamples+1 then curSample = 1 end
first=true
elseif key.KeyCode == tcod.Up then
-- up arrow : previous sample
curSample = curSample - 1
if curSample == 0 then curSample = nbSamples end
first=true
elseif key.KeyCode == tcod.PrintScreen then
-- save screenshot
tcod.system.saveScreenshot("screenshot0.png")
end
end