Initial data commit

Task/Bitmap/Tcl/bitmap.tcl

@@ -0,0 +1,30 @@
+package require Tcl 8.5
+package require Tk
+namespace path ::tcl::mathfunc ;# for [max] function
+
+proc newImage {width height} {
+    return [image create photo -width $width -height $height]
+}
+proc fill {image colour} {
+    $image put $colour -to 0 0 [$image cget -width] [$image cget -height]
+}
+proc setPixel {image colour point} {
+    lassign $point x y
+    $image put $colour -to [max 0 $x] [max 0 $y]
+}
+proc getPixel {image point} {
+    lassign $point x y
+    # [$img get] returns a list: {r g b}; this proc should return a colour value
+    format {#%02x%02x%02x} {*}[$image get $x $y]
+}
+
+# create the image and display it
+set img [newImage 150 150]
+label .l -image $img
+pack .l
+
+fill $img red
+
+setPixel $img green {40 40}
+
+set rbg [getPixel $img {40 40}]