<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi, <div>Years ago I had a career as a technical illustrator. First analog then digital. Perhaps the following code I developed back around 1992 might be helpful to you.</div><div><br></div><div><div>H = Horizontal coordinate on picture plane.</div><div><br></div><div>V = Vertical coordinate on picture plane.</div><div><br></div><div>XYZ = 3D coordinate.</div><div><br></div><div>distance = "camera" distance from the model:</div><div>a range of values [0..15000] (logrithmic).</div><div><br></div><div>height = "camera" height from 0 ground plane.</div><div><br></div><div>H := scale * (X * distance / (Y + distance)) + H_offset;</div><div>V := scale * ((Z - height) * D / (Y + distance)) + Y_offset;</div><br><div id="AppleMailSignature" dir="ltr">Thomas Young<div>330-256-7064</div><div>Sent from my iPhone</div></div><div dir="ltr"><br>On Sep 17, 2019, at 11:20 AM, Mgr. Janusz Chmiel <<a href="mailto:janusz.chmiel@volny.cz">janusz.chmiel@volny.cz</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr">
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<div>Please would somebody of us try to tell Me, if Android API functions can
detect how many fingers have been used to touch The display even while Talkback
screen reader work ane Explore by touch service is communicating with
display?</div>
<div>I do not want to use graphical mode, since it require that Talkback screen
reader must be turned off. One developer, who have used Java language used some
technique, which could detect how many fingers have been used to shift from down
to up. If one or two. Thank you very much for yours tips how to detect this
specific touch events when Talkback is running.</div></div></div>
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