2 files changed, 84 insertions, 0 deletions
diff --git a/rkt/double.rkt b/rkt/double.rkt
new file mode 100644
index 0000000..3ef0755
--- /dev/null
+++ b/rkt/double.rkt
@@ -0,0 +1,9 @@
+#lang racket
+
+(define (double v)
+  ((if (string? v) string-append +) v v))
+
+(string-append "ba"
+               (double "na"))
+
+(double 21)
\ No newline at end of file
diff --git a/rkt/pixel/pixel.rkt b/rkt/pixel/pixel.rkt
new file mode 100644
index 0000000..7e2f198
--- /dev/null
+++ b/rkt/pixel/pixel.rkt
@@ -0,0 +1,75 @@
+#lang racket/gui
+
+(define frame (new frame%
+                   [label "Pixel Pixel Pixel Pixel Pixel Pixel"]
+                   [width 600]
+                   [height 600]))
+
+(define cell-size 20)
+(define selected-color "black")
+
+;; Create a set of predefined colors
+(define colors '("black" "white" "red" "green" "blue" "yellow" "purple" "orange"))
+
+(define my-canvas%
+  (class canvas%
+    (super-new)
+    (inherit get-dc get-width get-height)
+    
+    (define/override (on-paint)
+      (define dc (get-dc))
+      (define canvas-width (get-width))
+      (define canvas-height (get-height))
+      (define grid-width (quotient canvas-width cell-size))
+      (define grid-height (quotient canvas-height cell-size))
+      (define grid (make-vector grid-width (make-vector grid-height "")))
+      
+      ;; Draw the stored colors
+      (for ([x (in-range grid-width)]
+            [y (in-range grid-height)])
+        (let ([color (vector-ref (vector-ref grid x) y)])
+          (when (not (string=? color ""))
+            (send dc draw-rectangle (* x cell-size) (* y cell-size) cell-size cell-size)))))
+    
+    (define/override (on-event event)
+      (define canvas-width (get-width))
+      (define canvas-height (get-height))
+      (define grid-width (quotient canvas-width cell-size))
+      (define grid-height (quotient canvas-height cell-size))
+      
+      (when (send event button-down?)
+        (let ([x (quotient (send event get-x) cell-size)]
+              [y (quotient (send event get-y) cell-size)])
+          (when (and (< x grid-width) (< y grid-height))
+            (define grid (make-vector grid-width (make-vector grid-height "")))
+            (vector-set! (vector-ref grid x) y selected-color)
+            (send (get-dc) set-brush selected-color 'solid)
+            (send (get-dc) draw-rectangle (* x cell-size) (* y cell-size) cell-size cell-size)))))))
+
+(define canvas (new my-canvas% [parent frame]))
+
+;; Layout the UI components
+(define main-panel (new vertical-panel% [parent frame]))
+
+;; Add a horizontal panel to hold the canvas and color picker
+(define canvas-panel (new horizontal-panel%
+                          [parent main-panel]
+                          [stretchable-width #t]
+                          [stretchable-height #t]))
+
+;; Add the canvas to the canvas panel
+(new my-canvas% [parent canvas-panel]
+                [min-width 600]
+                [min-height 600])
+
+(define color-panel (new horizontal-panel%
+                         [parent main-panel]
+                         [alignment '(right top)]))
+
+(new choice% [parent color-panel]
+             [label "Pick Color: "]
+             [choices colors]
+             [callback (lambda (choice event)
+                         (set! selected-color (send choice get-string-selection)))])
+
+(send frame show #t)
\ No newline at end of file