Data commit

Task/Bitmap-Write-a-PPM-file/Raku/bitmap-write-a-ppm-file.raku

@@ -0,0 +1,30 @@
+class Pixel { has uint8 ($.R, $.G, $.B) }
+class Bitmap {
+    has UInt ($.width, $.height);
+    has Pixel @!data;
+
+    method fill(Pixel $p) {
+        @!data = $p.clone xx ($!width*$!height)
+    }
+    method pixel(
+	  $i where ^$!width,
+	  $j where ^$!height
+	  --> Pixel
+      ) is rw { @!data[$i*$!height + $j] }
+
+    method data { @!data }
+}
+
+role PPM {
+    method P6 returns Blob {
+	"P6\n{self.width} {self.height}\n255\n".encode('ascii')
+	~ Blob.new: flat map { .R, .G, .B }, self.data
+    }
+}
+
+my Bitmap $b = Bitmap.new(width => 125, height => 125) but PPM;
+for flat ^$b.height X ^$b.width -> $i, $j {
+    $b.pixel($i, $j) = Pixel.new: :R($i*2), :G($j*2), :B(255-$i*2);
+}
+
+$*OUT.write: $b.P6;