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module TestFigure
/** Example library to demonstrate the use of Existential Types.
The library implements a simple set of drawing objects.
Create a new project. Set the Environment to "Object IO".
Set "Project Options" to "No Console".
Have fun.
Peter Achten
April 14 2008.
*/
import StdEnv, Figure
Start :: *World -> *World
Start world = drawFigure figure6 world
figure0 = mkFigures
[ rectangle a b
, ellips a b
, text "Hello" (movePoint {vx=(b.x-a.x)/5,vy=(b.y-a.y)/2} a)
]
where
a = {x=20, y=20 }
b = {x=180,y=180}
figure1 = mkFigures
[ ellips a (movePoint {vx=r,vy=r} a) \\ r <- [10,20..400]]
where
a = {x=20,y=20}
figure2 = mkFigures
[ text (toString c) {x=r,y=r} \\ c <- ['a'..'z'] & r <- [0,25..]]
figure3 = mkFigures [figure0,figure1,figure2]
figure4 = mkFigures
[ line c (movePoint {vx=toInt (r*(cos angle)),vy=toInt (r*(sin angle))} c)
\\ angle <- [0.0,2.0*PI/360.0..2.0*PI]
]
where
c = {x=200,y=200}
r = 180.0
figure5 = mkFigures
[ text (toString cc) (movePoint {vx=toInt (radius*(cos angle)),vy=toInt (radius*(sin angle))} c)
\\ angle <- [0.0,2.0*PI/(toReal nrchars)..2.0*PI]
& cc <- chars
]
where
c = {x=200,y=200}
radius = 180.0
chars = ['A'..'Z']
nrchars = length chars
figure5` = mkFigures
[ mkFigures [pencolour colour, text (toString cc) (movePoint {vx=toInt (radius*(cos angle)),vy=toInt (radius*(sin angle))} c)]
\\ angle <- [0.0,2.0*PI/(toReal nrchars)..2.0*PI]
& cc <- chars
& colour <- [ RGB { r = begin.r + (eind.r-begin.r)*i/nrchars
, g = begin.g + (eind.g-begin.g)*i/nrchars
, b = begin.b + (eind.b-begin.b)*i/nrchars
}
\\ i <- [1..nrchars]
]
]
where
c = {x=200,y=200}
radius = 180.0
chars = ['A'..'Z']
nrchars = length chars
begin = {r=255, g= 20, b=200}
eind = {r=0, g=234, b=100}
figure6 = mkFigures (
[ pensize 3 ] ++
[ move {vx=(edges-1)*(toInt (2.0 * radius)),vy=toInt (1.5 * radius)}
( mkFigures [ line {x=toInt (cos ( i *2.0*PI/(toReal edges))*radius), y=toInt (sin ( i *2.0*PI/(toReal edges))*radius)}
{x=toInt (cos ((i+1.0)*2.0*PI/(toReal edges))*radius), y=toInt (sin ((i+1.0)*2.0*PI/(toReal edges))*radius)}
\\ i <- map toReal [1..edges]
]
)
\\ edges <- [2..8]
])
where
radius = 80.0
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