Refactor presets scaling and clean up patterns

Made-with: Cursor

pico/src/patterns/scale_test.py

@@ -0,0 +1,56 @@
+import utime
+
+
+RED = (255, 0, 0)
+
+
+class ScaleTest:
+    """
+    Animated test for the scale() helper.
+
+    A single red pixel moves along the reference strip (strip 0). For each other
+    strip, the position is mapped using:
+
+        n2 = scale(l1, l2, n1)
+
+    so that all lit pixels stay aligned by proportional position along the strips.
+    """
+
+    def __init__(self, driver):
+        self.driver = driver
+
+    def run(self, preset):
+        strips = self.driver.strips
+        if not strips:
+            return
+
+        src_strip_idx = 0
+        l1 = self.driver.strip_length(src_strip_idx)
+        if l1 <= 0:
+            return
+
+        step = self.driver.step
+        delay_ms = max(1, int(getattr(preset, "d", 30) or 30))
+        last_update = utime.ticks_ms()
+        color = self.driver.apply_brightness(RED, getattr(preset, "b", 255))
+
+        while True:
+            now = utime.ticks_ms()
+            if utime.ticks_diff(now, last_update) >= delay_ms:
+                n1 = step % l1
+
+                # Clear all strips
+                for strip in strips:
+                    strip.fill((0, 0, 0))
+
+                # Light mapped position on each strip using Presets.set/show
+                for dst_strip_idx, _ in enumerate(strips):
+                    self.driver.set(dst_strip_idx, n1, color)
+                    self.driver.show(dst_strip_idx)
+
+                step += 1
+                self.driver.step = step
+                last_update = now
+
+            yield
+