help/rise_run_angle.htm

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<p>Rise_Run_Angle ($F593)</p>

<p>Given a (rise,run) pair, this routine calculates the angle
which corresponds to that (rise,run) pair. The returned angle is
relative to the x-axis (+ is CCW), so to convert it to a Vectrex
angle (relative to the y-axis, + is CCW), you must subtract the
number 0x10 (90 degrees) from the returned value. </p>

<p>&nbsp;</p>

<p>ENTRY:</p>

<p>DP = $C8</p>

<p>A-reg = rise value</p>

<p>B-reg = run value</p>

<p>&nbsp;</p>

<p>EXIT:</p>

<p>A-reg = the angle from the x-axis</p>

<p>B-reg = the angle from the x-axis</p>

<p>All other registers preserved.</p>

<p>&nbsp;</p>

<p><a href="bios.htm#F593">Source</a></p>
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