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authorPierre-Antoine Rouby <contact@parouby.fr>2019-05-29 22:53:44 +0200
committerDavid Thompson <dthompson2@worcester.edu>2019-05-31 09:51:18 -0400
commitfaba3b60ca4d4e9d4545cb5d8511db02a332855f (patch)
tree335afa738e2cb9fa2a198b1575470f80fc2431fa /sdl2/render.scm
parente455ed5e2d41cb5f8c0f4d536f650a40a9cdc534 (diff)
render: Add SDL_RenderDrawLines binding.
* sdl2/bindings.scm (sdl-render-draw-lines): New procedure. * sdl2/render.scm (render-draw-lines): New procedure. * doc/api.texi: Document it.
Diffstat (limited to 'sdl2/render.scm')
-rw-r--r--sdl2/render.scm16
1 files changed, 16 insertions, 0 deletions
diff --git a/sdl2/render.scm b/sdl2/render.scm
index 326745f..0b92bc4 100644
--- a/sdl2/render.scm
+++ b/sdl2/render.scm
@@ -39,6 +39,7 @@
render-copy
set-render-draw-color
render-draw-line
+ render-draw-lines
render-draw-point
render-draw-points
@@ -115,6 +116,21 @@ color."
"Draw line on RENDERER."
(ffi:sdl-render-draw-line (unwrap-renderer renderer) x1 y1 x2 y2))
+(define (render-draw-lines renderer points)
+ "Draw lines connecting POINTS on RENDERER."
+ (define (fill-bv bv l n)
+ (match l
+ (() bv)
+ (((x y) . r)
+ (s32vector-set! bv n x)
+ (s32vector-set! bv (+ n 1) y)
+ (fill-bv bv r (+ 2 n)))))
+ (let* ((count (length points))
+ (bv (fill-bv (make-s32vector (* count 2)) points 0)))
+ (ffi:sdl-render-draw-lines (unwrap-renderer renderer)
+ (bytevector->pointer bv)
+ count)))
+
(define (render-draw-point renderer x y)
"Draw point on RENDERER."
(ffi:sdl-render-draw-point (unwrap-renderer renderer) x y))