MetaFun - Pragma ADE
MetaFun - Pragma ADE MetaFun - Pragma ADE
86 Curves finally are made up out of points, and each point has two control points. Since the tension specifier finally becomes a control point, it is not surprising that you may specify two tension values. If we replace the tension in the previous example by .. tension i and 2i .. we get the following graphic: If we swap both values (.. tension 2i and i ..) we get: We mentioned control points. We will now draw a few extreme tensions and show the control points as METAPOST calculates them. sample (z1 .. tension 0.75 .. z2 .. z3, .625red) ; sample (z1 .. tension 2.00 .. z2 .. z3, .625yellow) ; sample (z1 .. z2 .. z3, .625white) ; First we will show the symmetrical tensions. A few more details Inflection, tension and curl
The asymetrical tensions are less prominent. We use the following values: sample (z1 .. tension .75 and 10 .. z2 .. z3, .625red) ; sample (z1 .. tension 10 and .75 .. z2 .. z3, .625yellow) ; sample (z1 .. z2 .. z3, .625white) ; What happens when you use the METAPOST maximum value of infinity instead of 10? Playing with this kind of graphic can be fun, especially when we apply a few tricks. def sample (expr p, c) = draw p withpen pencircle scaled 2.5mm withcolor white ; draw p withpen pencircle scaled 2.0mm withcolor c ; enddef; u := 1cm ; z1 = (0,0) ; z2 = (2u,4u) ; z3 = (4u,0) ; for i=0 step .05 until 1 : Inflection, tension and curl A few more details 87
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86<br />
Curves finally are made up out of points, and each point has two control points. Since the tension<br />
specifier finally becomes a control point, it is not surprising that you may specify two tension<br />
values. If we replace the tension in the previous example by<br />
.. tension i and 2i ..<br />
we get the following graphic:<br />
If we swap both values (.. tension 2i and i ..) we get:<br />
We mentioned control points. We will now draw a few extreme tensions and show the control<br />
points as METAPOST calculates them.<br />
sample (z1 .. tension 0.75 .. z2 .. z3, .625red) ;<br />
sample (z1 .. tension 2.00 .. z2 .. z3, .625yellow) ;<br />
sample (z1 .. z2 .. z3, .625white) ;<br />
First we will show the symmetrical tensions.<br />
A few more details Inflection, tension and curl
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