math: vector: Add custom record type printers for vectors.

* chickadee/math/vector.scm (display-vec2, display-vec3): New
  procedures.

1 files changed, 12 insertions, 0 deletions

diff --git a/chickadee/math/vector.scm b/chickadee/math/vector.scm
index 89b4f33..cdc9b82 100644
--- a/chickadee/math/vector.scm
+++ b/chickadee/math/vector.scm
@@ -16,8 +16,10 @@
 ;;; <http://www.gnu.org/licenses/>.
 
 (define-module (chickadee math vector)
+  #:use-module (ice-9 format)
   #:use-module (rnrs bytevectors)
   #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-9 gnu)
   #:use-module (system foreign)
   #:use-module (chickadee math)
   #:export (vec2
@@ -163,6 +165,16 @@ polar coordinate (R, THETA)."
   "Set the z coordinate of the vec3 V to Z."
   (vec3-set! v 2 z))
 
+(define (display-vec2 v port)
+  (format port "#<vec2 x: ~f y: ~f>" (vec2-x v) (vec2-y v)))
+
+(set-record-type-printer! <vec2> display-vec2)
+
+(define (display-vec3 v port)
+  (format port "#<vec3 x: ~f y: ~f z: ~f>" (vec3-x v) (vec3-y v) (vec3-z v)))
+
+(set-record-type-printer! <vec3> display-vec3)
+
 (define (vec2-copy! source-vec2 target-vec2)
   "Copy TARGET-VEC2 to SOURCE-VEC2."
   (set-vec2-x! target-vec2 (vec2-x source-vec2))