/**
* Sets a specified texture's OpenGL <code>Texture</code> parameters.
*
* @param dc the current draw context.
* @param texture the texture whose parameters to set.
*/
protected void setTextureParameters(DrawContext dc, Texture texture) {
// Enable the appropriate mip-mapping texture filters if the caller has specified that
// mip-mapping should be
// enabled, and the texture itself supports mip-mapping.
boolean useMipMapFilter =
this.useMipMaps
&& (this.getTextureData().getMipmapData() != null
|| texture.isUsingAutoMipmapGeneration());
GL gl = dc.getGL();
gl.glTexParameteri(
GL.GL_TEXTURE_2D,
GL.GL_TEXTURE_MIN_FILTER,
useMipMapFilter ? GL.GL_LINEAR_MIPMAP_LINEAR : GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
if (this.isUseAnisotropy() && useMipMapFilter) {
double maxAnisotropy = dc.getGLRuntimeCapabilities().getMaxTextureAnisotropy();
if (dc.getGLRuntimeCapabilities().isUseAnisotropicTextureFilter() && maxAnisotropy >= 2.0) {
gl.glTexParameterf(
GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAX_ANISOTROPY_EXT, (float) maxAnisotropy);
}
}
}
protected void applyColor(DrawContext dc, java.awt.Color color, double opacity) {
if (dc.isPickingMode()) return;
double finalOpacity = opacity * (color.getAlpha() / 255.0);
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
OGLUtil.applyColor(gl, color, finalOpacity, true);
}
protected void render(DrawContext dc, Vec4 p1, Vec4 p2, double radius) {
// To compute the rotation of the cylinder axis to the orientation of the vector between the
// two points,
// this method performs the same operation as Vec4.axisAngle() but with a "v2" of <0, 0, 1>.
// Compute rotation angle
double length = p1.distanceTo3(p2);
Vec4 u1 = new Vec4((p2.x - p1.x) / length, (p2.y - p1.y) / length, (p2.z - p1.z) / length);
double angle = Math.acos(u1.z);
// Compute the direction cosine factors that define the rotation axis
double A = -u1.y;
double B = u1.x;
double L = Math.sqrt(A * A + B * B);
GL gl = dc.getGL();
// pushReferenceCenter performs the translation of the pipe's origin to point p1 and the
// necessary
// push/pop of the modelview stack. Otherwise we'd need to include a glPushMatrix and
// gl.glTranslated(p1.x, p1.y, p1.z) above the rotation, and a corresponding glPopMatrix after
// the
// call to glCallIst.
dc.getView().pushReferenceCenter(dc, p1);
gl.glRotated(angle * TO_DEGREES, A / L, B / L, 0);
gl.glScaled(
radius, radius, length / 2); // length / 2 because cylinder is created with length 2
dc.getGL().glCallList(this.glListId);
dc.getView().popReferenceCenter(dc);
}
/** {@inheritDoc} */
public void render(DrawContext dc) {
TreeLayout layout = this.getLayout();
if (layout != null) {
if (!dc.isOrderedRenderingMode()) dc.addOrderedRenderable(this);
else layout.render(dc);
}
}
protected void setDepthFunc(DrawContext dc, OrderedIcon uIcon, Vec4 screenPoint) {
GL gl = dc.getGL();
if (uIcon.icon.isAlwaysOnTop()) {
gl.glDepthFunc(GL.GL_ALWAYS);
return;
}
Position eyePos = dc.getView().getEyePosition();
if (eyePos == null) {
gl.glDepthFunc(GL.GL_ALWAYS);
return;
}
double altitude = eyePos.getElevation();
if (altitude < (dc.getGlobe().getMaxElevation() * dc.getVerticalExaggeration())) {
double depth = screenPoint.z - (8d * 0.00048875809d);
depth = depth < 0d ? 0d : (depth > 1d ? 1d : depth);
gl.glDepthFunc(GL.GL_LESS);
gl.glDepthRange(depth, depth);
} else if (uIcon.eyeDistance > uIcon.horizonDistance) {
gl.glDepthFunc(GL.GL_EQUAL);
gl.glDepthRange(1d, 1d);
} else {
gl.glDepthFunc(GL.GL_ALWAYS);
}
}
/**
* Draws text for subsequent Label ordered renderables in the ordered renderable list. This method
* is called after the text renderer has been set up (after beginRendering has been called), so
* this method can only draw text for subsequent labels that use the same font and rotation as
* this label. This method differs from {@link #drawBatched(gov.nasa.worldwind.render.DrawContext)
* drawBatched} in that this method reuses the active text renderer context to draw as many labels
* as possible without switching text renderer state.
*
* @param dc the current draw context.
* @param textRenderer Text renderer used to draw the label.
*/
protected void drawBatchedText(DrawContext dc, TextRenderer textRenderer) {
// Draw as many as we can in a batch to save ogl state switching.
Object nextItem = dc.peekOrderedRenderables();
if (!dc.isPickingMode()) {
while (nextItem != null && nextItem instanceof TacticalGraphicLabel) {
TacticalGraphicLabel nextLabel = (TacticalGraphicLabel) nextItem;
if (!nextLabel.isEnableBatchRendering()) break;
boolean sameFont = this.font.equals(nextLabel.getFont());
boolean sameRotation =
(this.rotation == null && nextLabel.rotation == null)
|| (this.rotation != null && this.rotation.equals(nextLabel.rotation));
boolean drawInterior = nextLabel.isDrawInterior();
// We've already set up the text renderer state, so we can can't change the font or text
// rotation.
// Also can't batch render if the next label needs an interior since that will require
// tearing down the
// text renderer context.
if (!sameFont || !sameRotation || drawInterior) break;
dc.pollOrderedRenderables(); // take it off the queue
nextLabel.doDrawText(textRenderer);
nextItem = dc.peekOrderedRenderables();
}
}
}
protected static boolean isTileVisible(
DrawContext dc, Tile tile, double minDistanceSquared, double maxDistanceSquared) {
if (!tile.getSector().intersects(dc.getVisibleSector())) return false;
View view = dc.getView();
Position eyePos = view.getEyePosition();
if (eyePos == null) return false;
Angle lat =
clampAngle(
eyePos.getLatitude(),
tile.getSector().getMinLatitude(),
tile.getSector().getMaxLatitude());
Angle lon =
clampAngle(
eyePos.getLongitude(),
tile.getSector().getMinLongitude(),
tile.getSector().getMaxLongitude());
Vec4 p = dc.getGlobe().computePointFromPosition(lat, lon, 0d);
double distSquared = dc.getView().getEyePoint().distanceToSquared3(p);
//noinspection RedundantIfStatement
if (minDistanceSquared > distSquared || maxDistanceSquared < distSquared) return false;
return true;
}
public void updateContext(DrawContext ctx) {
Coloring c =
(Coloring) stringMap.get(ctx.getBuffer(), ctx.getTokenOffset(), ctx.getTokenLength());
if (c != null) {
c.apply(ctx);
}
}
/**
* Establish the OpenGL state needed to draw text.
*
* @param dc the current draw context.
*/
protected void beginDrawing(DrawContext dc) {
GL gl = dc.getGL();
int attrMask =
GL.GL_DEPTH_BUFFER_BIT // for depth test, depth mask and depth func
| GL.GL_TRANSFORM_BIT // for modelview and perspective
| GL.GL_VIEWPORT_BIT // for depth range
| GL.GL_CURRENT_BIT // for current color
| GL.GL_COLOR_BUFFER_BIT // for alpha test func and ref, and blend
| GL.GL_DEPTH_BUFFER_BIT // for depth func
| GL.GL_ENABLE_BIT; // for enable/disable changes
this.BEogsh.pushAttrib(gl, attrMask);
if (!dc.isPickingMode()) {
gl.glEnable(GL.GL_BLEND);
OGLUtil.applyBlending(gl, false);
}
// Do not depth buffer the label. (Labels beyond the horizon are culled above.)
gl.glDisable(GL.GL_DEPTH_TEST);
gl.glDepthMask(false);
// The image is drawn using a parallel projection.
this.BEogsh.pushProjectionIdentity(gl);
gl.glOrtho(
0d, dc.getView().getViewport().width, 0d, dc.getView().getViewport().height, -1d, 1d);
this.BEogsh.pushModelviewIdentity(gl);
}
/**
* Draw labels for picking.
*
* @param dc Current draw context.
* @param pickSupport the PickSupport instance to be used.
*/
protected void doPick(DrawContext dc, PickSupport pickSupport) {
GL gl = dc.getGL();
Angle heading = this.rotation;
double headingDegrees;
if (heading != null) headingDegrees = heading.degrees;
else headingDegrees = 0;
int x = this.screenPoint.x;
int y = this.screenPoint.y;
boolean matrixPushed = false;
try {
if (headingDegrees != 0) {
gl.glPushMatrix();
matrixPushed = true;
gl.glTranslated(x, y, 0);
gl.glRotated(headingDegrees, 0, 0, 1);
gl.glTranslated(-x, -y, 0);
}
for (int i = 0; i < this.lines.length; i++) {
Rectangle2D bounds = this.lineBounds[i];
double width = bounds.getWidth();
double height = bounds.getHeight();
x = this.screenPoint.x;
if (this.textAlign.equals(AVKey.CENTER)) x = x - (int) (width / 2.0);
else if (this.textAlign.equals(AVKey.RIGHT)) x = x - (int) width;
y -= this.lineHeight;
Color color = dc.getUniquePickColor();
int colorCode = color.getRGB();
PickedObject po = new PickedObject(colorCode, this.getPickedObject(), this.position, false);
pickSupport.addPickableObject(po);
// Draw line rectangle
gl.glColor3ub((byte) color.getRed(), (byte) color.getGreen(), (byte) color.getBlue());
try {
gl.glBegin(GL.GL_POLYGON);
gl.glVertex3d(x, y, 0);
gl.glVertex3d(x + width - 1, y, 0);
gl.glVertex3d(x + width - 1, y + height - 1, 0);
gl.glVertex3d(x, y + height - 1, 0);
gl.glVertex3d(x, y, 0);
} finally {
gl.glEnd();
}
y -= this.lineSpacing;
}
} finally {
if (matrixPushed) {
gl.glPopMatrix();
}
}
}
public void testMaliciousSetIcons() {
// Create an Iterable with null elements.
java.util.List<WWIcon> list = new java.util.ArrayList<WWIcon>();
list.add(null);
IconLayer layer =
new IconLayer() {
// Override to avoid View initialization issues.
public boolean isLayerActive(DrawContext dc) {
return true;
}
};
layer.setIcons(list);
DrawContext dc = new DrawContextImpl();
dc.setModel(new BasicModel());
dc.setView(new BasicOrbitView());
try {
// Test that the layer does not fail when the Iterable is used.
layer.render(dc);
} catch (NullPointerException e) {
fail("Layer does not check for null elements in Iterable");
}
}
protected void initializeTexture(DrawContext dc) {
Texture iconTexture = dc.getTextureCache().getTexture(this.getIconFilePath());
if (iconTexture != null) return;
try {
InputStream iconStream = this.getClass().getResourceAsStream("/" + this.getIconFilePath());
if (iconStream == null) {
File iconFile = new File(this.iconFilePath);
if (iconFile.exists()) {
iconStream = new FileInputStream(iconFile);
}
}
iconTexture = TextureIO.newTexture(iconStream, false, null);
iconTexture.bind();
this.iconWidth = iconTexture.getWidth();
this.iconHeight = iconTexture.getHeight();
dc.getTextureCache().put(this.getIconFilePath(), iconTexture);
} catch (IOException e) {
String msg = Logging.getMessage("layers.IOExceptionDuringInitialization");
Logging.logger().severe(msg);
throw new WWRuntimeException(msg, e);
}
GL gl = dc.getGL();
gl.glTexParameteri(
GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR); // _MIPMAP_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
// Enable texture anisotropy, improves "tilted" world map quality.
int[] maxAnisotropy = new int[1];
gl.glGetIntegerv(GL.GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, maxAnisotropy, 0);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAX_ANISOTROPY_EXT, maxAnisotropy[0]);
}
/**
* Select the visible grid elements
*
* @param dc the current <code>DrawContext</code>.
*/
protected void selectRenderables(DrawContext dc) {
if (dc == null) {
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
Sector vs = dc.getVisibleSector();
OrbitView view = (OrbitView) dc.getView();
// Compute labels offset from view center
Position centerPos = view.getCenterPosition();
Double pixelSizeDegrees =
Angle.fromRadians(
view.computePixelSizeAtDistance(view.getZoom())
/ dc.getGlobe().getEquatorialRadius())
.degrees;
Double labelOffsetDegrees = pixelSizeDegrees * view.getViewport().getWidth() / 4;
Position labelPos =
Position.fromDegrees(
centerPos.getLatitude().degrees - labelOffsetDegrees,
centerPos.getLongitude().degrees - labelOffsetDegrees,
0);
Double labelLatDegrees = labelPos.getLatitude().normalizedLatitude().degrees;
labelLatDegrees = Math.min(Math.max(labelLatDegrees, -76), 78);
labelPos =
new Position(
Angle.fromDegrees(labelLatDegrees), labelPos.getLongitude().normalizedLongitude(), 0);
if (vs != null) {
for (GridElement ge : this.gridElements) {
if (ge.isInView(dc)) {
if (ge.renderable instanceof GeographicText) {
GeographicText gt = (GeographicText) ge.renderable;
if (labelPos.getLatitude().degrees < 72
|| "*32*34*36*".indexOf("*" + gt.getText() + "*") == -1) {
// Adjust label position according to eye position
Position pos = gt.getPosition();
if (ge.type.equals(GridElement.TYPE_LATITUDE_LABEL))
pos =
Position.fromDegrees(
pos.getLatitude().degrees,
labelPos.getLongitude().degrees,
pos.getElevation());
else if (ge.type.equals(GridElement.TYPE_LONGITUDE_LABEL))
pos =
Position.fromDegrees(
labelPos.getLatitude().degrees,
pos.getLongitude().degrees,
pos.getElevation());
gt.setPosition(pos);
}
}
this.graticuleSupport.addRenderable(ge.renderable, GRATICULE_UTM);
}
}
// System.out.println("Total elements: " + count + " visible sector: " + vs);
}
}
public void updateContext(DrawContext ctx) {
if (foreColor != null) {
ctx.setForeColor(foreColor);
}
if (backColor != null) {
ctx.setBackColor(backColor);
}
}
/**
* Draw this label during ordered rendering.
*
* @param dc Current draw context.
* @param pickSupport Support object used during picking.
*/
protected void doDrawOrderedRenderable(DrawContext dc, PickSupport pickSupport) {
TextRenderer textRenderer =
OGLTextRenderer.getOrCreateTextRenderer(dc.getTextRendererCache(), font);
if (dc.isPickingMode()) {
this.doPick(dc, pickSupport);
} else {
this.drawText(dc, textRenderer);
}
}
protected static boolean isServiceVisible(DrawContext dc, PlaceNameService placeNameService) {
//noinspection SimplifiableIfStatement
if (!placeNameService.isEnabled()) return false;
return (dc.getVisibleSector() != null)
&& placeNameService.getMaskingSector().intersects(dc.getVisibleSector());
//
// return
// placeNameService.getExtent(dc).intersects(dc.getView().getFrustumInModelCoordinates());
}
protected Angle computeIconRadius(DrawContext dc, double regionPixelSize, Sector drawSector) {
double minCosLat =
Math.min(drawSector.getMinLatitude().cos(), drawSector.getMaxLatitude().cos());
if (minCosLat < 0.001) return Angle.POS180;
Rectangle2D iconDimension = this.computeDrawDimension(regionPixelSize); // Meter
double dLat = iconDimension.getHeight() / dc.getGlobe().getRadius();
double dLon = iconDimension.getWidth() / dc.getGlobe().getRadius() / minCosLat;
return Angle.fromRadians(Math.sqrt(dLat * dLat + dLon * dLon) / 2);
}
@SuppressWarnings({"RedundantIfStatement"})
public boolean isInView(DrawContext dc) {
if (!viewFrustum.intersects(this.getExtent(dc.getGlobe(), dc.getVerticalExaggeration())))
return false;
// Check apparent size
if (getSizeInPixels(dc) <= MIN_CELL_SIZE_PIXELS) return false;
return true;
}
public void updateContext(DrawContext ctx) {
int pos = ctx.getFragmentOffset();
if (pos >= blocks[curInd] && pos < blocks[curInd + 1]) {
if (coloring == null) {
coloring = ctx.getEditorUI().getColoring(SettingsNames.HIGHLIGHT_SEARCH_COLORING);
}
if (coloring != null) {
coloring.apply(ctx);
}
}
}
public boolean isActive(DrawContext ctx, MarkFactory.DrawMark mark) {
int nextActivityOffset;
coloring = null;
if (mark == null) return false;
if (ctx.getEditorUI().getComponent() == null || !mark.activateLayer) return false;
BaseDocument doc = ctx.getEditorUI().getDocument();
// Gets the active annotation attached to this mark. It is possible
// that
// no active annotation might exist for the mark
AnnotationDesc anno = doc.getAnnotations().getActiveAnnotation(mark);
if (anno == null) return false;
int nextLineStart = -1;
try {
nextLineStart = Utilities.getRowStart(doc, ctx.getFragmentOffset(), 1);
} catch (BadLocationException e) {
return false;
}
if (nextLineStart < 0) { // end of doc
nextLineStart = Integer.MAX_VALUE;
}
if (anno.isWholeLine()) {
nextActivityOffset = nextLineStart;
} else {
nextActivityOffset = ctx.getFragmentOffset() + anno.getLength();
if (nextActivityOffset > nextLineStart) nextActivityOffset = nextLineStart;
}
setNextActivityChangeOffset(nextActivityOffset);
coloring = anno.getColoring();
// The following code ensures that if active annotation does not
// have highlight the color of next one will be used.
// It was decided that it will not be used
//
// if (coloring.getBackColor() == null) {
// AnnotationDesc[] annos =
// doc.getAnnotations().getPasiveAnnotations(anno.getLine());
// if (annos != null) {
// for (int i=0; i<annos.length; i++) {
// if (annos[i].getColoring().getBackColor() != null) {
// coloring = annos[i].getColoring();
// break;
// }
// }
// }
// }
return true;
}
protected static boolean isNameVisible(
DrawContext dc, PlaceNameService service, Position namePosition) {
double elevation = dc.getVerticalExaggeration() * namePosition.getElevation();
Vec4 namePoint =
dc.getGlobe()
.computePointFromPosition(
namePosition.getLatitude(), namePosition.getLongitude(), elevation);
Vec4 eyeVec = dc.getView().getEyePoint();
double dist = eyeVec.distanceTo3(namePoint);
return dist >= service.getMinDisplayDistance() && dist <= service.getMaxDisplayDistance();
}
/**
* Draws the graphic as an ordered renderable.
*
* @param dc the current draw context.
*/
protected void makeOrderedRenderable(DrawContext dc) {
if (this.lines == null || this.position == null) return;
this.computeGeometryIfNeeded(dc);
// Don't draw if beyond the horizon.
double horizon = dc.getView().getHorizonDistance();
if (this.eyeDistance > horizon) return;
if (this.intersectsFrustum(dc)) dc.addOrderedRenderable(this);
if (dc.isPickingMode()) this.pickLayer = dc.getCurrentLayer();
}
@Override
protected void doRender(DrawContext dc) {
if (this.frameTimestamp != dc.getFrameTimeStamp()) {
this.assembleControlPoints(dc);
this.frameTimestamp = dc.getFrameTimeStamp();
}
this.markerRenderer.render(dc, this.controlPoints);
if (this.annotation != null && isShowAnnotation()) {
this.annotation.render(dc);
}
}
/**
* Determine if this label intersects the view or pick frustum.
*
* @param dc Current draw context.
* @return True if this label intersects the active frustum (view or pick). Otherwise false.
*/
protected boolean intersectsFrustum(DrawContext dc) {
View view = dc.getView();
Frustum frustum = view.getFrustumInModelCoordinates();
// Test the label's model coordinate point against the near and far clipping planes.
if (this.placePoint != null
&& (frustum.getNear().distanceTo(this.placePoint) < 0
|| frustum.getFar().distanceTo(this.placePoint) < 0)) {
return false;
}
if (dc.isPickingMode()) return dc.getPickFrustums().intersectsAny(this.screenExtent);
else return view.getViewport().intersects(this.screenExtent);
}
public void init(DrawContext ctx) {
if (enabled) {
try {
BaseDocument doc = ctx.getEditorUI().getDocument();
blocks =
FindSupport.getFindSupport()
.getBlocks(blocks, doc, ctx.getStartOffset(), ctx.getEndOffset());
} catch (BadLocationException e) {
blocks = new int[] {-1, -1};
}
coloring = null; // reset so it will be re-read
curInd = 0;
}
}
/**
* Compute the lat/lon position of the view center
*
* @param dc the current DrawContext
* @param view the current View
* @return the ground position of the view center or null
*/
protected Position computeGroundPosition(DrawContext dc, View view) {
if (view == null) return null;
Position groundPos =
view.computePositionFromScreenPoint(
view.getViewport().getWidth() / 2, view.getViewport().getHeight() / 2);
if (groundPos == null) return null;
double elevation =
dc.getGlobe().getElevation(groundPos.getLatitude(), groundPos.getLongitude());
return new Position(
groundPos.getLatitude(),
groundPos.getLongitude(),
elevation * dc.getVerticalExaggeration());
}
protected void endDrawIcons(DrawContext dc) {
if (dc.isPickingMode()) this.pickSupport.endPicking(dc);
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
if (dc.isPickingMode()) {
gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_TEXTURE_ENV_MODE, OGLUtil.DEFAULT_TEX_ENV_MODE);
gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_SRC0_RGB, OGLUtil.DEFAULT_SRC0_RGB);
gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_COMBINE_RGB, OGLUtil.DEFAULT_COMBINE_RGB);
}
gl.glBindTexture(GL.GL_TEXTURE_2D, 0);
this.oglStackHandler.pop(gl);
}
protected void drawIconsInBatch(DrawContext dc, OrderedIcon uIcon) {
this.drawIcon(dc, uIcon);
// Draw as many as we can in a batch to save ogl state switching.
Object nextItem = dc.peekOrderedRenderables();
while (nextItem != null && nextItem instanceof OrderedIcon) {
OrderedIcon oi = (OrderedIcon) nextItem;
if (oi.getRenderer() != this) return;
dc.pollOrderedRenderables(); // take it off the queue
this.drawIcon(dc, oi);
nextItem = dc.peekOrderedRenderables();
}
}
public boolean isActive(DrawContext ctx, MarkFactory.DrawMark mark) {
boolean active;
if (mark != null) {
active = mark.activateLayer;
} else {
JTextComponent c = ctx.getEditorUI().getComponent();
active =
(c != null)
&& c.getCaret().isSelectionVisible()
&& ctx.getFragmentOffset() >= c.getSelectionStart()
&& ctx.getFragmentOffset() < c.getSelectionEnd();
}
return active;
}
public double getSizeInPixels(DrawContext dc) {
View view = dc.getView();
Vec4 centerPoint =
getSurfacePoint(dc, this.centroid.getLatitude(), this.centroid.getLongitude());
Double distance = view.getEyePoint().distanceTo3(centerPoint);
return this.size / view.computePixelSizeAtDistance(distance);
}