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MathGroup Archive 2007

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Re: Crinkled Hyperbola (ContourPlot in Manipulate)

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  • Subject: [mg77857] Re: [mg77822] Crinkled Hyperbola (ContourPlot in Manipulate)
  • From: Carl Woll <carlw at>
  • Date: Mon, 18 Jun 2007 07:03:31 -0400 (EDT)
  • References: <>

Bruce Colletti wrote:

>Re Mathematica 6.0 under WinXP.
>As the slider moves, a point glides along the hyperbola:  
>PointSize at 0.02,Point@{Cosh@h,Sinh@h}}],
>However, the moving point crinkles the plot, which restores itself when the mouse button is released.
>What causes the crinkling (this seems tied to ContourPlot, since no crinkling occurs when I use Plot[Sqrt[x^2-1],...])?
Use the option PerformanceGoal->"Quality" in ContourPlot:

 ContourPlot[x^2 - y^2 == 1, {x, -3, 3}, {y, -3, 3},
  Epilog -> {PointSize at 0.02, Point@{Cosh@h, Sinh@h}},
  PerformanceGoal -> "Quality"], {h, -1.5, 1.5}]

Carl Woll
Wolfram Research

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