module drawingframe

// ********************************************************************************
// Clean tutorial example program.
//
// This program defines a framework in which one can test drawing functions.
// The program relies on a function, example, of type *Picture -> *Picture.
// ********************************************************************************

import StdEnv, StdIO

Start :: *World -> *World
Start world = startIO SDI Void (snd o openWindow Void testwindow) [ProcessClose closeProcess] world

testwindow = Window "Test Drawing" NilLS [
    WindowViewSize size, 
    WindowClose (noLS closeProcess),
    WindowLook True (\_ _ . example o (setPenColour Red) o (setPenBack Green)),
    WindowViewDomain {corner1=origin,corner2=maxdomain}
    ]
where
    size = {w=850,h=100}
    origin = {x=(-20),y=(-20)}
    maxdomain = {x=origin.x+size.w,y=origin.y+size.h}

// Rainbow
example pict = foldr id pict [fill {corner1={x=x1 * w,y=0},corner2={x=x1 * w + w,y=h}} o (setPenColour (rainbow (toReal x1 / 5.0))) \\ x1 <- [0..160]]
where
    w = 5
    h = 100
    rainbow :: a -> Colour | toReal a
    rainbow i = let i` = toReal i 
                    f = 0.3        in RGB { r = toInt (sin (f * i` + 0.0)       * 127.0) + 128,  // http://krazydad.com/tutorials/makecolors.php
                                            g = toInt (sin (f * i` + PI / 1.5)  * 127.0) + 128,
                                            b = toInt (sin (f * i` + PI / 0.75) * 127.0) + 128 }

// Points
//example = drawPointAt zero o (setPenSize 1)
//example = drawPointAt zero o (setPenSize 2)
//example = drawPointAt zero o (setPenSize 3)

// Lines
//example = drawLine zero {x=50,y=50} o (setPenSize 1)
//example = drawLine zero {x=50,y=50} o (setPenSize 2)
//example = drawLine zero {x=50,y=50} o (setPenSize 3)

// Text
//example = draw "p" o (draw "o") o (drawAt zero "P")     //@todo Pen is not moved
//example = drawAt {x=50,y=50} "Pop"

// Ovals
//example = drawAt zero {oval_rx=5, oval_ry=3}
//example = drawAt zero {oval_rx=5, oval_ry=5}
//example = drawAt zero {oval_rx=3, oval_ry=5}
//example = drawAt zero {oval_rx=5, oval_ry=5} o (setPenSize 1)
//example = drawAt zero {oval_rx=5, oval_ry=5} o (setPenSize 2)
//example = drawAt zero {oval_rx=5, oval_ry=5} o (setPenSize 3)
//example = fillAt zero {oval_rx=5, oval_ry=3}
//example = fillAt zero {oval_rx=5, oval_ry=5}
//example = fillAt zero {oval_rx=3, oval_ry=5}

// Curves
curve = { curve_oval        = { oval_rx=5, oval_ry=3 },
          curve_from        = PI / 6.0,
          curve_to          = 1.5 * PI,
          curve_clockwise   = True }
//example = undrawAt zero curve
//example = drawAt zero { curve & curve_clockwise = False } o (setPenSize 3)
//example = fillAt zero curve
//example = fillAt {x=50,y=50} { curve & curve_clockwise = False }

// Rectangles
//example = draw {zero & corner2={x=10,y=6}}
//example = draw {zero & corner2={x=10,y=10}}
//example = draw {zero & corner1={x=10,y=6}}
//example = draw {zero & corner2={x=10,y=10}} o (setPenSize 1)
//example = draw {zero & corner2={x=10,y=10}} o (setPenSize 2)
//example = draw {zero & corner2={x=10,y=10}} o (setPenSize 3)
//example = fill {zero & corner2={x=10,y=6}}
//example = fill {zero & corner2={x=10,y=10}}
//example = fill {zero & corner1={x=10,y=6}}

// Boxes
//example = draw {box_w = 20, box_h = 10} o (setPenSize 3)
//example = undrawAt {x=10,y=10} {box_w = -10, box_h = -20}
//example = fill {box_w = 20, box_h = 10}
//example = unfillAt {x=10,y=10} {box_w = -10, box_h = -20}

// Polygons
//example = undrawAt zero {polygon_shape=[{vx=8,vy=0},{vx=(-4),vy=8}]}
//example = drawAt zero {polygon_shape=[{vx=8,vy=0},{vx=0,vy=8},{vx=(-8),vy=0}]} o (setPenSize 3)
//example = fillAt zero {polygon_shape=[{vx=8,vy=0},{vx=(-8),vy=8},{vx=8,vy=0}]}
//example = unfillAt zero {polygon_shape=[{vx=8,vy=0},{vx=(-8),vy=8},{vx=8,vy=0}]}

// Bitmaps
//@todo

// ...
//@todo