NEW SEQUENCE

The NEW SEQUENCE command allows you to define a memory area where you can store a set of images coming from the screen (with the GET IMAGE command), or from another graphic resource.

The area must be defined by (constant) number of strips, (constant) frames, (constant) width and (constant) height, expressed in pixels. The actual size, in terms of bytes of RAM, will depend on the graphics mode selected at the time. If it is not possible to define an image in that screen mode, a specific error will be issued.

Generally speaking, it is not advisable to do a PUT IMAGE of a NEW SEQUENCE that has not been initialized, at least once, by a GET IMAGE. Infact, the PUT IMAGE tries to draw the contents of an uninitialized frame (i.e.: all zeros), including the palette. So it could draw everything empty in terms of bitmap, and then overwrites the entire palette with zeros, giving rise to unexpected result. So you have to use a preliminary GET IMAGE on any NEW SEQUENCE.

If you want to use the PUT IMAGE without side effects on palette, you can opt for the PUT BITMAP. In this case, ugBASIC will draw only the component related to the pixels, leaving the palette component unchanged.

EXAMPLE

 background = NEW SEQUENCE(2, 16, 32,32)