LayerManager:

The method of drawing layers we described above is fine if we have only a layer or two to deal with, but it would rapidly become very messy as we added more features. A LayerManager provides an easy way to tie all the layers together and draw them with a single statement.

For example, imagine we have variables to represent two Sprites and three
TiledLayers:

Sprite bird1, bird2;
TileLayer distance, foreground, middle;

Once we have created the objects concerned and assigned them to these variables, we create a LayerManager object:

LayerManager layerManager1 = new LayerManager();

Then we add the Layer objects to it, starting from the one we want to appear nearest to the user:

layerManager1.append(bird1);

layerManager1.append(bird2);

layerManager1.append(foreground);

layerManager1.append(middle);

layerManager1.append(background);

Now we can show them all at once!

layerManager1.paint(g, 0, 0);

When they are drawn they will overlay one another (like a stack of photographs), with the first one that was appended on the top of the stack and the last one that was appended at the bottom.

A LayerManager has its own coordinate system; by default the top left-hand corner is the origin (0, 0). The appended layers are actually placed on the LayerManager, so that their position is relative to the LayerManager's origin.

If we move a Sprite to position (25, 40), say, it will be 25 pixels to the right and 40 pixels down from the LayerManager's top left-hand corner. The LayerManager in turn can be painted where we like relative to the display, i.e. the top left-hand corner of the device screen.

For example, imagine the following code is executed:

bird1.move(25, 40); layerManager1.append(bird1); layerManager1.paint(g, 30, 50);

Figure: shows the resulting relationship between the display origin, the LayerManager origin and the position of the Sprite.

Figure: The coordinate system of the LayerManager

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