This method is so simple.
Just drawing on the (invisible) buffer screen, and only pasting the entire screen with "gcopy" to the display screen.

And I guess, this technique might be so useful for the layout of "Dungeon crawler" type RPGs.
Of course in other cases as well.

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And here is the revised sources.
The movement amount in the X & Y directions is calculated based on the vector in the Z direction.

By the way, this is not the "Bullet Hell" but the "Star Hell".

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And here is the source script.
This sample is actually running with an extension script called "d3m.hsp", and the overall script volume is much higher than this.
"#include" feature is so useful, and it makes possible to combine and run with other scripts easily by this.

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