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    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.

                          PURE       The MIT App Inventor interface supports over 21 languages, making it accessible
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                     Step  24   Click on the Canvas1 block from the Blocks palette to open its blocks.

                     Step  25   Drag the block when Canvas1.Dragged to the workspace.
                     Step  26    Drag the call Canvas1.DrawLine block and place it inside the when Canvas1.Dragged
                              block.

                     Step  27    Hover the mouse over prevX, select get prevX and connect it to x1 in the DrawLine
                              block.

                     Step  28   Hover the mouse over prevY, select get prevY and connect it to y1.

                     Step  29   Hover the mouse over currentX, select get currentX and connect it to x2.
                     Step  30   Hover the mouse over currentY, select get currentY and connect it to y2.

                                                                                              Touch to Motion with MIT  63

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