support clearing display

README.md

@@ -102,6 +102,16 @@ Draw a line of pixels on the display. Options:
     ]
 }
 
+### Clear
+Erases all pixels on the display to show a blank screen.
+{
+    "drawings": [
+        {
+            "type": "clear"
+        }
+    ]
+}
+
 ### Multiple drawings.
 Provide a list of drawings to place multiple elements on to the screen. The next DoCommand will erase the screen
 {

models.py

@@ -64,6 +64,8 @@ async def do_command(
                         pixels = drawing["pixels"]
                         width = drawing.get("width")
                         self.line(draw, pixels, width)
+                    case "clear":
+                        self.clear(draw)
         result["drawings"] = True
         return result
 
@@ -87,6 +89,9 @@ def line(self, draw, pixels: list[int], width):
             width=1
         draw.line(pixels, fill="white", width=width)
 
+    def clear(self, draw):
+        draw.clear()
+
     def reconfigure(self,
                     config: ComponentConfig,
                     dependencies: Mapping[ResourceName, ResourceBase]):