1 files changed, 63 insertions, 0 deletions
diff --git a/lib/Octans/GenerateFrame.rakumod b/lib/Octans/GenerateFrame.rakumod
new file mode 100644
index 0000000..ba7fc5b
--- /dev/null
+++ b/lib/Octans/GenerateFrame.rakumod
@@ -0,0 +1,63 @@
+# This module has been adapted from Fornax::GenerateFrame.
+
+use Cairo;
+use Octans::Hex2RGB;
+
+# Colors.
+constant %C = (
+    bg-main => "#ffffff",
+
+    red-subtle-bg => "#f2b0a2",
+    blue-subtle-bg => "#b5d0ff",
+    cyan-subtle-bg => "#c0efff",
+    green-subtle-bg => "#aecf90",
+
+    fg-main => "#000000",
+
+    fg-special-cold => "#093060",
+    fg-special-warm => "#5d3026",
+    fg-special-mild => "#184034",
+    fg-special-calm => "#61284f",
+).map: {.key => hex2rgb(.value)};
+
+enum IterStatus <Walking Blocked Completed>;
+
+sub generate-frame(
+    :%canvas, :$out, :$side, :@puzzle, :@visited, :%meta, :$found
+) is export {
+    given Cairo::Image.create(
+        Cairo::FORMAT_ARGB32, %canvas<width>, %canvas<height>
+    ) {
+        given Cairo::Context.new($_) {
+            # Paint the entire canvas white.
+            .rgb: |%C<bg-main>;
+            .rectangle(0, 0, %canvas<width>, %canvas<height>);
+            .fill;
+
+            # This seems to be slower than creating an intermediate
+            # variable and assigning from that. Difference is not much
+            # so we'll ignore it.
+            for ^%meta<rows> X ^%meta<cols>  -> ($r, $c) {
+                my Int @target = $c * $side, $r * $side,
+                                 $side, $side;
+                .rectangle: |@target;
+
+                if @visited[$r][$c] {
+                    .rgba: |%C<cyan-subtle-bg>, 0.72;
+                    .rgba: |%C<green-subtle-bg>, 0.84 if $found;
+                    .fill :preserve;
+                }
+
+                .select_font_face("Mono", Cairo::FONT_SLANT_NORMAL, Cairo::FONT_WEIGHT_NORMAL);
+                .set_font_size(72.0);
+                .move_to($c * $side + 32, ($r + 1) * $side - 28);
+
+                .rgb: |%C<fg-main>;
+                .show_text: @puzzle[$r][$c].uc;
+                .stroke;
+            }
+        }
+        .write_png($out);
+        .finish;
+    }
+}