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Learn how to create animated apps using Canvas and ImageSprite components. This tutorial covers the basics of drawing on Canvas, specifying coordinates, reacting to touches and drags, and animating objects.
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Creating Animated Apps：Canvas與ImageSprite 靜宜大學資管系 楊子青
1. Canvas Component • A two-dimensional touch-sensitive rectangular panel on which drawing can be done and sprites can be moved. • Any location on the Canvas can be specified as a pair of (X, Y) values, where • X is the number of pixels away from the left edge of the Canvas • Y is the number of pixels away from the top edge of the Canvas • There are events to tell when and where a Canvas has been touched or a Sprite has been dragged.
Adding a Canvas Component to App • You can drag a Canvas component into your app from the Basic palette. • specify the Canvas’s Width and Height. • Often span the width of the device screen: “Fill parent” • Height: 300
2. ImageSprite component • is an animated object that is contained by a canvas • can react to touches and drags, • interact with other sprites (image sprites and other balls) and the edge of the canvas, • and move according to its properties.
2.1 Timer event • One way to specify animation in App Inventor is to change an object in response to a timer event. • Most commonly, you’ll move sprites to different locations on the canvas at set time intervals.
