factor/library/ui/paint.factor

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! Copyright (C) 2005 Slava Pestov.
! See http://factor.sf.net/license.txt for BSD license.
IN: gadgets
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USING: generic hashtables kernel lists math namespaces sdl
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sdl-gfx sdl-ttf sdl-video stdio strings ;
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! The painting protocol. Painting is controlled by various
! dynamically-scoped variables.
! "Paint" is a namespace containing some or all of these values.
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: paint-property ( gadget key -- value )
swap gadget-paint hash ;
: set-paint-property ( gadget value key -- )
rot gadget-paint set-hash ;
! Colors are lists of three integers, 0..255.
SYMBOL: foreground ! Used for text and outline shapes.
SYMBOL: background ! Used for filled shapes.
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SYMBOL: reverse-video
: fg reverse-video get background foreground ? get ;
: bg reverse-video get foreground background ? get ;
SYMBOL: font ! a list of two elements, a font name and size.
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GENERIC: draw-shape ( obj -- )
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M: rectangle draw-shape drop ;
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! A rectangle only whose outline is visible.
TUPLE: hollow-rect delegate ;
C: hollow-rect ( x y w h -- rect )
[ >r <rectangle> r> set-hollow-rect-delegate ] keep ;
M: hollow-rect draw-shape ( rect -- )
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>r surface get r> rect>screen fg rgb rectangleColor ;
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! A rectangle that is filled.
TUPLE: plain-rect delegate ;
C: plain-rect ( x y w h -- rect )
[ >r <rectangle> r> set-plain-rect-delegate ] keep ;
M: plain-rect draw-shape ( rect -- )
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>r surface get r> rect>screen bg rgb boxColor ;
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! A rectangle that is filled, and has a visible outline.
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TUPLE: etched-rect delegate ;
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C: etched-rect ( x y w h -- rect )
[ >r <rectangle> r> set-etched-rect-delegate ] keep ;
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M: etched-rect draw-shape ( rect -- )
>r surface get r> 2dup
rect>screen bg rgb boxColor
rect>screen fg rgb rectangleColor ;
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! A rectangle that has a visible outline only if the rollover
! paint property is set.
SYMBOL: rollover?
TUPLE: roll-rect delegate ;
C: roll-rect ( x y w h -- rect )
[ >r <rectangle> r> set-roll-rect-delegate ] keep ;
M: roll-rect draw-shape ( rect -- )
rollover? get [
>r surface get r> rect>screen fg rgb rectangleColor
] [
drop
] ifte ;
M: line draw-shape ( line -- )
>r surface get r>
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line>screen
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fg rgb
aalineColor ;
M: ellipse draw-shape drop ;
TUPLE: hollow-ellipse delegate ;
C: hollow-ellipse ( x y w h -- ellipse )
[ >r <ellipse> r> set-hollow-ellipse-delegate ] keep ;
M: hollow-ellipse draw-shape ( ellipse -- )
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>r surface get r> ellipse>screen fg rgb
ellipseColor ;
TUPLE: plain-ellipse delegate ;
C: plain-ellipse ( x y w h -- ellipse )
[ >r <ellipse> r> set-plain-ellipse-delegate ] keep ;
M: plain-ellipse draw-shape ( ellipse -- )
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>r surface get r> ellipse>screen bg rgb
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filledEllipseColor ;
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! Strings are shapes too. This is somewhat of a hack and strings
! do not have x/y co-ordinates.
M: string shape-x drop 0 ;
M: string shape-y drop 0 ;
M: string shape-w
font get swap size-string ( h -) drop ;
M: string shape-h ( text -- h )
#! This is just the height of the current font.
drop font get lookup-font TTF_FontHeight ;
M: string draw-shape ( text -- )
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>r x get y get font get r>
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fg 3unlist make-color
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draw-string drop ;
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! Clipping
SYMBOL: clip
: intersect* ( gadget rect quot -- t1 t2 )
call >r >r max r> r> min 2dup > [ drop dup ] when ;
: intersect-x ( gadget rect -- x1 x2 )
[
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0 rectangle-x-extents >r swap 0 rectangle-x-extents r>
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] intersect* ;
: intersect-y ( gadget rect -- y1 y2 )
[
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0 rectangle-y-extents >r swap 0 rectangle-y-extents r>
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] intersect* ;
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: screen-bounds ( shape -- rect )
[ shape-x x get + ] keep
[ shape-y y get + ] keep
[ shape-w 1 + ] keep
shape-h 1 +
<rectangle> ;
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: clip-rect ( x1 x2 y1 y2 -- rect )
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over - 0 max >r >r over - 0 max r> swap r>
<rectangle> ;
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: intersect ( rect rect -- rect )
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[ intersect-x ] 2keep intersect-y clip-rect ;
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: >sdl-rect ( rectangle -- sdlrect )
[ rectangle-x ] keep
[ rectangle-y ] keep
[ rectangle-w ] keep
rectangle-h
make-rect ;
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: set-clip ( rect -- ? )
#! The top/left corner of the clip rectangle is the location
#! of the gadget on the screen. The bottom/right is the
#! intersected clip rectangle. Return t if the clip region
#! is an empty region.
surface get swap [ >sdl-rect SDL_SetClipRect drop ] keep
dup shape-w 0 = swap shape-h 0 = or ;
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GENERIC: shape-clip ( shape -- clip )
M: object shape-clip
#! By default, we clip to the bounds of the shape. However,
#! the hand disables clipping for its children.
screen-bounds ;
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: with-clip ( shape quot -- )
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#! All drawing done inside the quotation is clipped to the
#! shape's bounds. The quotation is called with a boolean
#! that is set to false if
[
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>r shape-clip clip [ intersect dup ] change set-clip r>
call
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] with-scope ; inline
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: draw-gadget ( gadget -- )
#! All drawing done inside draw-shape is done with the
#! gadget's paint. If the gadget does not have any custom
#! paint, just call the quotation.
dup gadget-paint [
dup [
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[
drop
] [
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dup draw-shape dup [
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gadget-children [ draw-gadget ] each
] with-trans
] ifte
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] with-clip
] bind ;