xmi
Note: This is taken from the Chicken Wiki, where a more recent version could be available.
An interface to the libxmi 2-D rasterization library. The library source itself are included in this egg.
(require-extension xmi)
The following functions are provided. For more information consult the libxmi info(1) documentation.
(xmi:new-painted-set) --> PAINTEDSET (xmi:delete-painted-set PAINTEDSET) (xmi:painted-set? X) --> BOOL (xmi:clear-painted-set PAINTEDSET) (xmi:new-gc U32VECTOR) --> GC (xmi:delete-gc GC) (xmi:copy-gc GC) --> GC (xmi:gc? X) --> BOOL (xmi:set-gcpixels GC U32VECTOR) (xmi:set-gcdashes GC U32VECTOR OFFSET) (xmi:set-gcattrib GC ATTRIB VALUE) xmi:gc-fill-rule --> ATTRIB xmi:gc-join-style --> ATTRIB xmi:gc-cap-style --> ATTRIB xmi:gc-line-style --> ATTRIB xmi:gc-arc-mode --> ATTRIB xmi:gc-line-width --> ATTRIB xmi:even-odd-rule --> FILL-RULE xmi:winding-rule --> FILL-RULE xmi:join-miter --> JOIN-STYLE xmi:join-round --> JOIN-STYLE xmi:join-bevel --> JOIN-STYLE xmi:join-triangular --> JOIN-STYLE xmi:cap-not-last --> CAP-STYLE xmi:cap-butt --> CAP-STYLE xmi:cap-round --> CAP-STYLE xmi:cap-projecting --> CAP-STYLE xmi:cap-triangular --> CAP-STYLE xmi:line-solid --> LINE-STYLE xmi:line-on-off-dash --> LINE-STYLE xmi:line-double-dash --> LINE-STYLE xmi:arc-chord --> ARC-MODE xmi:arc-pie-slice --> ARC-MODE (xmi:set-gcmiter-limit GC DOUBLE) (xmi:draw-points PAINTEDSET GC COORD-MODE S32VECTOR) (xmi:draw-lines PAINTEDSET GC COORD-MODE S32VECTOR) (xmi:fill-polygon PAINTEDSET GC COORD-MODE S32VECTOR) (xmi:draw-rectangles PAINTEDSET GC S32VECTOR) (xmi:fill-rectangles PAINTEDSET GC S32VECTOR) (xmi:draw-arcs PAINTEDSET GC S32VECTOR) (xmi:fill-arcs PAINTEDSET GC S32VECTOR) (xmi:draw-arcs-r PAINTEDSET GC S32VECTOR ELLIPSE-CACHE) xmi:coord-mode-origin --> COORD-MODE xmi:coord-mode-previous --> COORD-MODE xmi:shape-general --> POLYGON-SHAPE xmi:shape-convex --> POLYGON-SHAPE (xmi:new-ellipse-cache) --> ELLIPSE-CACHE (xmi:delete-ellipse-cache ELLLIPSE-CACHE) (xmi:ellipse-cache? X) --> BOOL (xmi:new-canvas WIDTH HEIGHT INIT-PIXEL) --> CANVAS (xmi:delete-canvas CANVAS) (xmi:canvas? X) --> BOOL (xmi:copy-canvas CANVAS) --> CANVAS (xmi:set-canvas-stipple CANVAS S32VECTOR [XOFFSET YOFFSET]) (xmi:set-canvas-texture CANVAS U32VECTOR [XOFFSET YOFFSET]) (xmi:set-pixel-merge2 CANVAS PROC) (xmi:set-pixel-merge3 CANVAS PROC) (xmi:copy-painted-set-to-canvas PAINTEDSET GC [XORIGIN YORIGIN]) (xmi:canvas-pixmap CANVAS [DESTINATION]) --> U32VECTOR
; The example from the libxmi documentation. Draws a few lines
; and a circle and writes a PPM file to stdout:
(use xmi)
(define points '#s32(25 5 5 5 5 25 35 22))
(define arc '#s32(20 15 30 16 0 17280))
(define pixels '#u32(1 2 3 4))
(define dashes '#u32(4 2))
(define gc (xmi:new-gc pixels))
(xmi:set-gcattrib gc xmi:gc-line-style xmi:line-on-off-dash)
(xmi:set-gcdashes gc dashes 0)
(xmi:set-gcattrib gc xmi:gc-line-width 0)
(define painted-set (xmi:new-painted-set))
(xmi:draw-lines painted-set gc xmi:coord-mode-origin points)
(xmi:draw-arcs painted-set gc arc)
(define canvas (xmi:new-canvas 60 35 0))
(xmi:copy-painted-set-to-canvas painted-set canvas)
(define buffer (xmi:canvas-pixmap canvas))
(display "P3\n60 35\n5\n")
(do ([i 0 (add1 i)])
((>= i 35))
(do ([j 0 (add1 j)])
((>= j 60))
(let ([c (u32vector-ref buffer (+ (* i 60) j))])
(printf "~a ~a ~a " c c c) ) )
(newline) )
(xmi:delete-canvas canvas)
(xmi:delete-gc gc)
(xmi:delete-painted-set painted-set)Copyright (c) 2005, Felix L. Winkelmann All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.