Examples of ScreenMap

org.geotools.renderer.ScreenMap

The screenmap is a packed bitmap of the screen, one bit per pixels. It can be used to avoid rendering a lot of very small features in the same pixel.

The screenmap can be used two ways:

By working directly against the pixels using {@link #checkAndSet(int,int)}
By working with real world envelopes using {@link #checkAndSet(Envelope)}, in that case the full math transform from data to screen, and the generalization spans must be set

When checkAndSet returns false the geometry sits in a pixel that has been already populated and can be skipped. @author jeichar @author Andrea Aime - OpenGeo @source $URL$

      final ServerPaintArea paintArea,
      final ServerRenderOptions options,
      final MathTransform transform,
      final double[] spans ) {
    if (screenMapEnabled) {
      screenMap = new ScreenMap(
          paintArea.getMinX() - options.metaBuffer,
          paintArea.getMinY() - options.metaBuffer,
          paintArea.getWidth() + (options.metaBuffer * 2),
          paintArea.getHeight() + (options.metaBuffer * 2));
      screenMap.setTransform(transform);

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Examples of ScreenMap

Examples of org.geotools.renderer.ScreenMap