Bryan Mumford <PICLIST@mitvma.mit.edu> wrote:

> I wanted to perform trig functions on integers in the range of +/-
> 1,000,000. I figured I would represent these numbers with three
> bytes. But what I really want is to plot circles

Bryan:

You should have said so originally.  Bresenham's circle algorithm:

        x = 0
        y = radius
        switch = 3 - 2*radius

    loop:

        plot (x,y): plot (x,-y): plot (-x,y): plot (-x,-y)
        plot (y,x): plot (y,-x): plot (-y,x): plot (-y,-x)

        if switch < 0 then
            switch = switch + 4 * x + 6
        else
            switch = switch + 4 * (x - y) + 10
            y = y - 1

        x = x + 1

        if x <= y then goto loop

        end

-Andy

=== Andrew Warren -- aiw@cypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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