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Step 13: Click on the Blocks button in the top-right corner to switch to the Blocks Editor.
Step 14: Click on the Button1 block from the Blocks palette to open its blocks.
Step 15: Drag the when Button1.Click block to the workspace.
Step 16: Click on the Canvas1 block from the Blocks palette to open its blocks.
Step 17: Drag the set Canvas1.PaintColor to block and place it inside the when Button1.Click block.
Step 18: Click on the Colors block from the Blocks palette to open its blocks.
Step 19: Drag the red colour block and connect it to the set Canvas1.PaintColor block.
Similarly, add the given blocks to change the paint colour on the Canvas: when Button2.
Click, set Canvas1.PaintColor to blue; and when Button3.Click, set Canvas1.PaintColor to
green.
Step 20: Click on the Button4 block from the Blocks palette to open its blocks.
Step 21: Drag the when Button4.Click block to the workspace.
Step 22: Click on the Canvas1 block from the Blocks palette to open its blocks.
Step 23: Drag the call Canvas1.Clear block and place it inside the when Button4.Click block.
App Development 75
