RendererUtilities needs calculateEnvelopeFromOGCScale
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Key: GEOT-1918
URL: http://jira.codehaus.org/browse/GEOT-1918
Project: GeoTools
Issue Type: New Feature
Components: core render
Reporter: mahmut keygubatli
Assignee: Jesse Eichar
I want to write a combobox with defined scales. If the user choose one in the
combobox the map will rendered in this scale.
So I have changed the formula in RendererUtilities.calculateOGCScale that he
give me the Envelope for the given scale.
Can You put this method to the RendererUtilities or give me svn acces?
public static ReferencedEnvelope
calculateEnvelopeFromOGCScale(ReferencedEnvelope envelope, double scale, int
imageWidth, Map hints) {
// if it's geodetic, we're dealing with lat/lon unit measures
if(envelope.getCoordinateReferenceSystem() instanceof GeographicCRS) {
//calculate the width
double worldWidth= (scale * (imageWidth / getDpi(hints) *
0.0254))/OGC_DEGREE_TO_METERS;
// and put it to the center
Coordinate pcenter = envelope.centre();
ReferencedEnvelope retEnv = new ReferencedEnvelope(
pcenter.x-worldWidth,
pcenter.x+worldWidth,
pcenter.y, pcenter.y,
envelope.getCoordinateReferenceSystem());
return retEnv;
} else {
double worldWidth= ((imageWidth / getDpi(hints) * 0.0254)*scale)/2;
Coordinate pcenter = envelope.centre();
ReferencedEnvelope retEnv = new ReferencedEnvelope(
pcenter.x-worldWidth,
pcenter.x+worldWidth,
pcenter.y, pcenter.y,
envelope.getCoordinateReferenceSystem());
return retEnv;
}
}
thanx
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