/**
* Create new instance
*
* @param type the type of shape.
* @param env the area that is visible. If shape is not in area then skip.
* @param mt the transform to go from data to the envelope (and that should be used to transform
* the shape coords)
* @param hasOpacity
*/
public MultiPointHandler(
ShapeType type, Envelope env, Rectangle screenSize, MathTransform mt, boolean hasOpacity)
throws TransformException {
if (mt == null) {
throw new NullPointerException();
}
this.type = type;
this.bbox = env;
this.mt = mt;
screenMap = GeometryHandlerUtilities.calculateScreenSize(screenSize, hasOpacity);
Point2D span = GeometryHandlerUtilities.calculateSpan(mt, 0, 0);
this.spanx = span.getX();
this.spany = span.getY();
}
/*
* (non-Javadoc)
*
* @see org.geotools.data.shapefile.shp.ShapeHandler#read(java.nio.ByteBuffer,
* org.geotools.data.shapefile.shp.ShapeType)
*/
public Object read(ByteBuffer buffer, ShapeType type) {
if (type == ShapeType.NULL) {
return null;
}
// read bounding box
Envelope geomBBox = GeometryHandlerUtilities.readBounds(buffer);
if (!bbox.intersects(geomBBox)) {
return null;
}
boolean bboxdecimate = geomBBox.getWidth() <= spanx && geomBBox.getHeight() <= spany;
int numParts = buffer.getInt();
double[][] coords = new double[numParts][];
double[][] transformed = new double[numParts][];
// if bbox is less than a pixel then decimate the geometry. But
// orientation must
// remain the same so geometry data must be parsed.
if (bboxdecimate) {
coords = new double[1][];
coords[0] = new double[2];
transformed = new double[1][];
transformed[0] = new double[2];
coords[0][0] = buffer.getDouble();
coords[0][1] = buffer.getDouble();
try {
mt.transform(coords[0], 0, transformed[0], 0, 1);
} catch (Exception e) {
ShapefileRenderer.LOGGER.severe(
"could not transform coordinates " + e.getLocalizedMessage());
transformed[0] = coords[0];
}
if (screenMap.get((int) transformed[0][0], (int) transformed[0][1])) {
LOGGER.finest("Point already rendered" + transformed[0][0] + " " + transformed[0][1]);
return null;
}
screenMap.set((int) transformed[0][0], (int) transformed[0][1], true);
} else {
int partsInBBox = 0;
for (int part = 0; part < numParts; part++) {
coords[part] = new double[2];
coords[part][0] = buffer.getDouble();
coords[part][1] = buffer.getDouble();
if (!bbox.contains(coords[part][0], coords[part][1])) continue;
if (!mt.isIdentity()) {
try {
transformed[partsInBBox] = new double[2];
mt.transform(coords[part], 0, transformed[partsInBBox], 0, 1);
} catch (Exception e) {
ShapefileRenderer.LOGGER.severe(
"could not transform coordinates " + e.getLocalizedMessage());
transformed[partsInBBox] = coords[part];
}
} else {
transformed[partsInBBox] = new double[2];
System.arraycopy(coords[part], 0, transformed[partsInBBox], 0, 1);
}
if (!screenMap.get((int) transformed[partsInBBox][0], (int) transformed[partsInBBox][1]))
partsInBBox++;
}
if (partsInBBox == 0) return null;
if (partsInBBox != numParts) {
double[][] tmp = new double[partsInBBox][];
System.arraycopy(transformed, 0, tmp, 0, partsInBBox);
transformed = tmp;
}
}
return createGeometry(type, geomBBox, transformed);
}