[visad] paint non linear scale

• To: visad@xxxxxxxxxxxxxxxx
• Subject: [visad] paint non linear scale
• From: "Roman Sachar" <romsac@xxxxx>
• Date: Mon, 10 Sep 2007 21:28:43 +0200

Hello
Thanks to Bill(thanks..) i find out how to use CoordinateSystem,but I
now have another problem with displaying data.
When I use a point mode everything is ok:->
[url=http://img266.imageshack.us/my.php?image=pointmodegl4.png][img=http://img266.imageshack.us/img266/7214/pointmodegl4

.th.png][/url]
link:http://img266.imageshack.us/img266/7214/pointmodegl4.th.png
I have points for y=2,3,4,5,15,18
but when I switch to a "normal"mode- point mode set to false ,the
sections are not painted in place where I want them to

be drawn (for y=18 i want from (18+15)/2 or 15+ (15/18)*3 to 18 ;for
y=15 I want from (15+4)/2 or 4+(4/15)*11
but I get
[url=http://img266.imageshack.us/my.php?image=normalmodeep8.png][img=http://img266.imageshack.us/img266/5843/normalmodee

p8.th.png][/url]

link:http://img266.imageshack.us/img266/5843/normalmodeep8.th.png

  so that 15 is not in proper place..
Is there a way to display it how I want (correctly -I can't catch Is
this displayed now)

I have another question.
I display a very large data (in my real application).Making visad
display takes some time and costs a lot of memory.
For example I have 1000000 for x axis (a1,a2..a100000)
I would like to display at first all samples but I could count
averedges so (a1+a2+a3+a4)/4 etc at displays it and when

user zoom
so that he could see normal sample I would like to show him normal
samples.Is there a way to find out how many samples

are now displayed for one pixel?? with extending MouseBehaviorJ2D I
understand that I can only find out about scaling

(how much I scale in a step on zooming)

Thanks for any help
Roman Sachar

Code:(whitch i think may be helpfull..)
latitude = RealType.getRealType("latitude");
    longitude = RealType.getRealType("longitude");
    RealType longitudeB =
RealType.getRealType("logitudeB",SI.second,null);
 
loglatitude=RealType.getRealType("loglatitude",CommonUnit.promiscuous);

 
   
    CoordinateSystem logCS = new MyCoordinateSystem(new
RealTupleType(loglatitude,longitudeB));
    double[]val=new double[] {1.0,2.0,3.0,4.0,15.0,18.0};
    ((MyCoordinateSystem)logCS).setAxisYValues(val);
    domain_tuple = new RealTupleType(latitude, longitude,logCS,null);
    temperature = RealType.getRealType("temperature");
    func_dom_temp = new FunctionType( domain_tuple, temperature);

    int NCOLS = 7;//the order could be inproper
    int NROWS = 6;

   
    domain_set = new Linear2DSet(domain_tuple, 1.0, NCOLS, NCOLS,1.0,
NROWS, NROWS);
float[][] temp_vals = new float[][]{{1, 6, 12, 18, 24,30},
    {1, 7, 12, 19, 25,31},
    {2, 8, 14, 20, 26,32},
    {3, 9, 15, 21, 27,33},
  {4, 10, 16, 22, 28,34},
  {4, 10, 16, 22, 28,35},
    {5, 11, 17, 23, 29,37}  };
float[][] flat_samples = new float[1][NCOLS * NROWS];
for(int c = 0; c < NROWS; c++)
      for(int r = 0; r < NCOLS; r++)
      {
      flat_samples[0][ c * NCOLS+ r ] = temp_vals[r][c];
      }
vals_ff = new FlatField( func_dom_temp, domain_set);
etc..

and


public class MyCoordinateSystem extends CoordinateSystem {
public void setAxisYValues(double []val) {
valy=val;

}
public double[][] toReference(double[][] values) throws
VisADException {
if (valy==null || values == null || values[0].length < 1) return
values;    
    int len = values[0].length;
    double[][] logValues = new double[getDimension()][len];
    System.arraycopy(values[0],0,logValues[0],0,logValues[0].length);
    int width=values[0].length/valy.length;
    int k=0;
    for (int i=0;i<valy.length;i++) {
    for (int j=0;j<width;j++) {
    logValues[1][k++]=valy[valy.length-i-1];
    }
    }
    for(int i = 2; i < getDimension(); i++)
    {
    System.arraycopy(values[i],0,logValues[i],0,logValues[i].length);
    }
    return logValues;
}


}
Once more:
Thanks for any help ..

P.S.I'm resending this mail because it didn't appear on visad-list..
Should I wait or is something wrong?

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