Trouble constructing a drawer rail with MP

* Trouble constructing a drawer rail with MP
@ 2021-05-21 10:56 Willi Egger
  2021-05-21 11:15 ` Jairo A. del Rio
  0 siblings, 1 reply; 5+ messages in thread
From: Willi Egger @ 2021-05-21 10:56 UTC (permalink / raw)
  To: NTG-Context ConTeXt users

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Hello MP Gurus!

I wanted to make a technical drawing. However the enclosed mwe does not give me the required results.

While the vector from point 1 is directing in the desired direction of 194 degrees, the second vector from point 2 does not as defined point in the direction of 166 degrees.

What am I doing wrong here?

Thanks for pointing me into the right direction :-)

Willi

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[-- Attachment #1.2.2: test-rail.pdf --]
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\startuniqueMPgraphic{Rail}
	path p[];
	pair Pkt[];

	p[100] := unitsquare xscaled 15mm yscaled 50mm;
	p[101] := (lrcorner p[100]--urcorner p[100]) shifted (-5mm,0) ;

	Pkt[1] := point 1.2 of p[100];
	Pkt[2] := point 1.8 of p[100];

	p[102] := Pkt[1]--dir(194)*10mm;

	Pkt[3] := p[102] intersectionpoint p[101];

	p[103] := Pkt[2]--dir(166)*10mm;

	Pkt[4] := p[103] intersectionpoint p[101];

	p[104] := lrcorner p[100]--Pkt[1]--Pkt[3]--Pkt[4]--Pkt[2]--urcorner p[100];

	draw p[104];

	draw p[100];
	draw p[101] dashed withdots;

	for i = 1 upto 4 :
	 draw Pkt[i] withpen pencircle scaled 3pt withcolor red;
  endfor;

	label.lft(textext("Pkt 2"),Pkt[3]);
	label.lft(textext("Pkt 4"),Pkt[4]);
	label.rt(textext("Pkt 1"), Pkt[1]);
	label.rt(textext("Pkt 2"), Pkt[2]);
\stopuniqueMPgraphic

\startTEXpage

	\useMPgraphic{Rail}

\stopTEXpage

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