use of org.geotoolkit.display2d.style.labeling.LabelDescriptor in project geotoolkit by Geomatys.
the class TextSymbolizerRenderer method presentations.
@Override
public Stream<Presentation> presentations(MapLayer layer, Feature feature) {
// test if the symbol is visible on this feature
if (!symbol.isVisible(feature))
return Stream.empty();
// we adjust coefficient for rendering ------------------------------
final float coeff;
if (dispGeom) {
// symbol is in display unit
coeff = 1;
} else {
// we have a special unit we must adjust the coefficient. We adapt it to the current region of interest,
// by computin scale difference between objective and display
final AffineTransform inverse = renderingContext.getObjectiveToDisplay();
coeff = (float) (this.coeff * Math.abs(AffineTransforms2D.getScale(inverse)));
}
// start to extract label parameters---------------------------------
String label = symbol.getLabel(feature);
// nothing to paint
if (label == null)
return Stream.empty();
label = label.trim();
// nothing to paint
if (label.isEmpty())
return Stream.empty();
final CachedHalo halo = symbol.getHalo();
final CachedLabelPlacement placement = symbol.getPlacement();
// extract halo parameters
final float haloWidth;
final Paint haloPaint;
if (halo != null) {
haloWidth = halo.getWidth(feature);
haloPaint = halo.getJ2DPaint(feature, 0, 0, hints);
} else {
haloWidth = 0;
haloPaint = Color.WHITE;
}
/* Extract text parameters.
* Note:
* There's an ambiguity in SE encoding. Section 11 defines that any size, including font size, should use
* defined UOMs. However, text symbology section 11.4.3 states that font size unit is always in pixels.
* For now, we force no coefficient, to match both:
* - Most specific information (11.4.3)
* - Most common use-case. Unit of measurement is useful mostly for displacements, to ensure text does not
* overlap geometry at given zoom levels. However, for texts, pixel values is often preferred, to ensure
* lisibility on screen.
*
* TODO: A better way might be to allow expressions suffixed with "px", as defined in SE section 11, last phrase.
* For now, however, we do not code this solution, because it should be applied on any size in style,
* and would require a big rework. Sizes should provide Measures instead of numeric values to check if measure
* has a local uom (expressed as a suffix), or none, in case the context defined uom should be used.
*/
final Paint fontPaint = symbol.getFontPaint(feature, 0, 0, 1, hints);
final Font j2dFont = symbol.getJ2dFont(feature, 1);
// symbolizer doesnt match the featuretype, no geometry found with this name.
final ProjectedGeometry projectedGeometry = new ProjectedGeometry(renderingContext);
projectedGeometry.setDataGeometry(GO2Utilities.getGeometry(feature, symbol.getSource().getGeometry()), null);
if (placement instanceof CachedPointPlacement) {
final CachedPointPlacement pp = (CachedPointPlacement) placement;
final float[] anchor = pp.getAnchor(feature, null);
final float[] disp = pp.getDisplacement(feature, null);
final float rotation = pp.getRotation(feature);
final LabelDescriptor descriptor = new DefaultPointLabelDescriptor(label, j2dFont, fontPaint, haloWidth, haloPaint, anchor[0], anchor[1], // SE 11.3.2: displacement is expressed in defined unit of measurement
disp[0] * coeff, disp[1] * coeff, rotation, renderingContext.getDisplayCRS(), projectedGeometry);
final TextPresentation tp = new TextPresentation(layer, layer.getData(), feature);
tp.forGrid(renderingContext);
tp.labelDesc = descriptor;
return Stream.of(tp);
} else if (placement instanceof CachedLinePlacement) {
final CachedLinePlacement lp = (CachedLinePlacement) placement;
final LabelDescriptor descriptor = new DefaultLinearLabelDescriptor(label, j2dFont, fontPaint, haloWidth, haloPaint, // SE section 11: Gap and initial gap are defined using UOM.
lp.getGap(feature) * coeff, lp.getInitialGap(feature) * coeff, // SE 11.1.4 and 11.4.4: Perpendicular offset is in defined unit of measurement
lp.getOffset(feature) * coeff, lp.isRepeated(), lp.isAligned(), lp.isGeneralizeLine(), projectedGeometry);
final TextPresentation tp = new TextPresentation(layer, layer.getData(), feature);
tp.forGrid(renderingContext);
tp.labelDesc = descriptor;
return Stream.of(tp);
} else {
ExceptionPresentation ep = new ExceptionPresentation(new PortrayalException("Text symbolizer has no label placement, this should not be possible."));
ep.setLayer(layer);
ep.setResource(layer.getData());
return Stream.of(ep);
}
}
use of org.geotoolkit.display2d.style.labeling.LabelDescriptor in project geotoolkit by Geomatys.
the class DisplacementLabelRenderer method portrayLabels.
/**
* {@inheritDoc }
*/
@Override
public boolean portrayLabels() {
final Graphics2D g2 = context.getGraphics();
// enable antialiasing for labels
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
List<Candidate> candidates = new ArrayList<Candidate>();
// generate all the candidates
// priority is in the order of the layers provided.
int priority = layers.size();
for (final LabelLayer layer : layers) {
for (LabelDescriptor label : layer.labels()) {
Candidate[] cs = null;
if (label instanceof PointLabelDescriptor) {
cs = pointRenderer.generateCandidat((PointLabelDescriptor) label);
} else if (label instanceof LinearLabelDescriptor) {
cs = LinearRenderer.generateCandidat((LinearLabelDescriptor) label);
} else {
cs = null;
}
if (cs != null) {
for (Candidate c : cs) {
c.setPriority(priority);
candidates.add(c);
}
}
}
priority--;
}
// displace or remove the candidates
candidates = optimize(candidates);
// paint the remaining candidates
for (Candidate candidate : candidates) {
if (candidate instanceof PointCandidate) {
pointRenderer.render(candidate);
} else if (candidate instanceof LinearCandidate) {
LinearRenderer.render(candidate);
}
}
layers.clear();
return !candidates.isEmpty();
}
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