ContourView class (a subclass of View)
Contour Plot object with optional color fills.
OS requirement: Release 3.0 or later.
Version: V0.92 92-12-03
[Archive maintainer, please put this into Objects/Classes directory.]
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Distinguishing features of this ContourView class are:
[1] It does color fills within contours just like colored geographical maps.
I am not aware of any other free source code that does this. (That's
why I had to write this.)
[2] It is a pretty self contained object in the form of a View subclass.
[3] PostScript may be copied onto pasteboard and pasted into other apps that
accept EPS date. Try pasting it into Yap document.
There is really no documentation. Look at the class implementation file
ContourView.m and an example test application CVtestApp.m for usage
information. The app included here is just for testing ContourView
class. ContourView is meant to be included in your apps like any other
objects.
It is pretty easy to use. If instantiated within IB, all you need to do
to get a plot is to call the following two method to get a default
plot. If you understand the following method, you can use the
ContourView object easily.
- setCartesianGridData:(float *)f :(float)xmin :(float)xmax
:(float)ymin :(float)ymax
ofSize:(int)nx :(int)ny
withInterpolationTo:(int)n1x :(int)n1y;
f[nx*ny] is a 1-d array containing 2-d grid data such that f[iy*nx+ix]
contains the value at (ix, iy).
Typicall, just 3 messages below will produce a contour plot with color
fills.
[contourView setCartesianGridData: fdata :1.0 :5.0 :1.0 :5.0
ofSize: 20 :20
withInterpolationTo: 50 :50];
[contourView setFillEnable:YES];
[contourView display];
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This can use a lot more optimizations which should speed up the drawing
significantly. Some of these are:
[1] All parameter changes currently trigger recomputation of all contour paths,
because almost everything is done in drawSelf:: method.
This should not be necessary for some. E.g., changing fill colors, line
width etc should not cause recomputation of contour paths.
[2] Use DoUserPath() etc to optimize drawing.
[3] Some methods are not yet implemented (It does what I wanted now).
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Send comments, bug reports, suggestions and improvements to below:
---
Izumi Ohzawa, Ph.D. [ 大澤五住 ]
USMail: University of California, 360 Minor Hall, Berkeley, CA 94720
Telephone: (510) 642-6440 Fax: (510) 642-3323
Internet: izumi@pinoko.berkeley.edu (NeXT Mail OK)
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.