/**
* Performs one line of sight calculation between the reference position and a specified grid
* position.
*
* @param gridPosition the grid position.
* @throws InterruptedException if the operation is interrupted.
*/
protected void performIntersection(Position gridPosition) throws InterruptedException {
// Intersect the line between this grid point and the selected position.
Intersection[] intersections = this.terrain.intersect(this.referencePosition, gridPosition);
if (intersections == null || intersections.length == 0) {
// No intersection, so the line goes from the center to the grid point.
this.sightLines.add(new Position[] {this.referencePosition, gridPosition});
return;
}
// Only the first intersection is shown.
Vec4 iPoint = intersections[0].getIntersectionPoint();
Vec4 gPoint =
terrain.getSurfacePoint(
gridPosition.getLatitude(), gridPosition.getLongitude(), gridPosition.getAltitude());
// Check to see whether the intersection is beyond the grid point.
if (iPoint.distanceTo3(this.referencePoint) >= gPoint.distanceTo3(this.referencePoint)) {
// Intersection is beyond the grid point; the line goes from the center to the grid point.
this.addSightLine(this.referencePosition, gridPosition);
return;
}
// Compute the position corresponding to the intersection.
Position iPosition = this.terrain.getGlobe().computePositionFromPoint(iPoint);
// The sight line goes from the user-selected position to the intersection position.
this.addSightLine(this.referencePosition, new Position(iPosition, 0));
// Keep track of the intersection positions.
this.addIntersectionPosition(iPosition);
this.updateProgress();
}
protected void assembleHeightControlPoints() {
if (this.controlPoints.size() < 2) return;
// Add one control point for the height between the first and second vertices.
// TODO: ensure that this control point is visible
Position firstVertex = this.controlPoints.get(0).getPosition();
Position secondVertex = this.controlPoints.get(1).getPosition();
Globe globe = this.wwd.getModel().getGlobe();
// Get cartesian points for the vertices
Vec4 firstPoint = globe.computePointFromPosition(firstVertex);
Vec4 secondPoint = globe.computePointFromPosition(secondVertex);
// Find the midpoint of the line segment that connects the vertices
Vec4 halfwayPoint = firstPoint.add3(secondPoint).divide3(2.0);
Position halfwayPosition = globe.computePositionFromPoint(halfwayPoint);
this.controlPoints.add(
new ControlPointMarker(
CHANGE_HEIGHT_ACTION,
halfwayPosition,
halfwayPoint,
this.heightControlAttributes,
this.controlPoints.size()));
}
protected void requestTile(DrawContext dc, Tile tile) {
Vec4 centroid = dc.getGlobe().computePointFromPosition(tile.getSector().getCentroid(), 0);
if (this.getReferencePoint() != null)
tile.setPriority(centroid.distanceTo3(this.getReferencePoint()));
RequestTask task = new RequestTask(tile, this);
this.getRequestQ().add(task);
}
protected void assembleVertexControlPoints(DrawContext dc) {
Terrain terrain = dc.getTerrain();
ExtrudedPolygon polygon = this.getPolygon();
Position refPos = polygon.getReferencePosition();
Vec4 refPoint = terrain.getSurfacePoint(refPos.getLatitude(), refPos.getLongitude(), 0);
int altitudeMode = polygon.getAltitudeMode();
double height = polygon.getHeight();
Vec4 vaa = null;
double vaaLength = 0; // used to compute independent length of each cap vertex
double vaLength = 0;
int i = 0;
for (LatLon location : polygon.getOuterBoundary()) {
Vec4 vert;
// Compute the top/cap point.
if (altitudeMode == WorldWind.CONSTANT || !(location instanceof Position)) {
if (vaa == null) {
// Compute the vector lengths of the top and bottom points at the reference position.
vaa = refPoint.multiply3(height / refPoint.getLength3());
vaaLength = vaa.getLength3();
vaLength = refPoint.getLength3();
}
// Compute the bottom point, which is on the terrain.
vert = terrain.getSurfacePoint(location.getLatitude(), location.getLongitude(), 0);
double delta = vaLength - vert.dot3(refPoint) / vaLength;
vert = vert.add3(vaa.multiply3(1d + delta / vaaLength));
} else if (altitudeMode == WorldWind.RELATIVE_TO_GROUND) {
vert =
terrain.getSurfacePoint(
location.getLatitude(),
location.getLongitude(),
((Position) location).getAltitude());
} else // WorldWind.ABSOLUTE
{
vert =
terrain
.getGlobe()
.computePointFromPosition(
location.getLatitude(),
location.getLongitude(),
((Position) location).getAltitude() * terrain.getVerticalExaggeration());
}
Position vertexPosition = this.wwd.getModel().getGlobe().computePositionFromPoint(vert);
this.controlPoints.add(
new ControlPointMarker(
MOVE_VERTEX_ACTION, vertexPosition, vert, this.vertexControlAttributes, i));
i++;
}
}
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();
}
// Draw the scale label
private void drawLabel(DrawContext dc, String text, Vec4 screenPoint) {
TextRenderer textRenderer =
OGLTextRenderer.getOrCreateTextRenderer(dc.getTextRendererCache(), this.defaultFont);
Rectangle2D nameBound = textRenderer.getBounds(text);
int x = (int) (screenPoint.x() - nameBound.getWidth() / 2d);
int y = (int) screenPoint.y();
textRenderer.begin3DRendering();
textRenderer.setColor(this.getBackgroundColor(this.color));
textRenderer.draw(text, x + 1, y - 1);
textRenderer.setColor(this.color);
textRenderer.draw(text, x, y);
textRenderer.end3DRendering();
}
/**
* Add a vertex to the polygon's outer boundary.
*
* @param mousePoint the point at which the mouse was clicked. The new vertex will be placed as
* near as possible to this point, at the elevation of the polygon.
*/
protected void addVertex(Point mousePoint) {
// Try to find the edge that is closest to a ray passing through the screen point. We're trying
// to determine
// the user's intent as to which edge a new two control points should be added to.
Line ray = this.wwd.getView().computeRayFromScreenPoint(mousePoint.getX(), mousePoint.getY());
Vec4 pickPoint = this.intersectPolygonAltitudeAt(ray);
double nearestDistance = Double.MAX_VALUE;
int newVertexIndex = 0;
// Loop through the control points and determine which edge is closest to the pick point
for (int i = 0; i < this.controlPoints.size(); i++) {
ControlPointMarker thisMarker = (ControlPointMarker) this.controlPoints.get(i);
ControlPointMarker nextMarker =
(ControlPointMarker) this.controlPoints.get((i + 1) % this.controlPoints.size());
Vec4 pointOnEdge =
AirspaceEditorUtil.nearestPointOnSegment(thisMarker.point, nextMarker.point, pickPoint);
if (!AirspaceEditorUtil.isPointBehindLineOrigin(ray, pointOnEdge)) {
double d = pointOnEdge.distanceTo3(pickPoint);
if (d < nearestDistance) {
newVertexIndex = i + 1;
nearestDistance = d;
}
}
}
Position newPosition = this.wwd.getModel().getGlobe().computePositionFromPoint(pickPoint);
// Copy the outer boundary list
ArrayList<Position> positionList = new ArrayList<Position>(this.controlPoints.size());
for (LatLon position : this.getPolygon().getOuterBoundary()) {
positionList.add((Position) position);
}
// Add the new vertex
positionList.add(newVertexIndex, newPosition);
this.getPolygon().setOuterBoundary(positionList);
}
/**
* Computes the lat/lon of the pickPoint over the world map
*
* @param dc the current <code>DrawContext</code>
* @param locationSW the screen location of the bottom left corner of the map
* @param mapSize the world map screen dimension in pixels
* @return the picked Position
*/
protected Position computePickPosition(DrawContext dc, Vec4 locationSW, Dimension mapSize) {
Position pickPosition = null;
Point pickPoint = dc.getPickPoint();
if (pickPoint != null) {
Rectangle viewport = dc.getView().getViewport();
// Check if pickpoint is inside the map
if (pickPoint.getX() >= locationSW.getX()
&& pickPoint.getX() < locationSW.getX() + mapSize.width
&& viewport.height - pickPoint.getY() >= locationSW.getY()
&& viewport.height - pickPoint.getY() < locationSW.getY() + mapSize.height) {
double lon = (pickPoint.getX() - locationSW.getX()) / mapSize.width * 360 - 180;
double lat =
(viewport.height - pickPoint.getY() - locationSW.getY()) / mapSize.height * 180 - 90;
double pickAltitude = 1000e3;
pickPosition = new Position(Angle.fromDegrees(lat), Angle.fromDegrees(lon), pickAltitude);
}
}
return pickPosition;
}
/**
* Compute points on either side of a line segment. This method requires a point on the line, and
* either a next point, previous point, or both.
*
* @param point Center point about which to compute side points.
* @param prev Previous point on the line. May be null if {@code next} is non-null.
* @param next Next point on the line. May be null if {@code prev} is non-null.
* @param leftPositions Left position will be added to this list.
* @param rightPositions Right position will be added to this list.
* @param halfWidth Distance from the center line to the left or right lines.
* @param globe Current globe.
*/
protected void generateParallelPoints(
Vec4 point,
Vec4 prev,
Vec4 next,
List<Position> leftPositions,
List<Position> rightPositions,
double halfWidth,
Globe globe) {
if ((point == null) || (prev == null && next == null)) {
String message = Logging.getMessage("nullValue.PointIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (leftPositions == null || rightPositions == null) {
String message = Logging.getMessage("nullValue.PositionListIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (globe == null) {
String message = Logging.getMessage("nullValue.GlobeIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
Vec4 offset;
Vec4 normal = globe.computeSurfaceNormalAtPoint(point);
// Compute vector in the direction backward along the line.
Vec4 backward = (prev != null) ? prev.subtract3(point) : point.subtract3(next);
// Compute a vector perpendicular to segment BC, and the globe normal vector.
Vec4 perpendicular = backward.cross3(normal);
double length;
// If both next and previous points are supplied then calculate the angle that bisects the angle
// current, next, prev.
if (next != null && prev != null && !Vec4.areColinear(prev, point, next)) {
// Compute vector in the forward direction.
Vec4 forward = next.subtract3(point);
// Calculate the vector that bisects angle ABC.
offset = forward.normalize3().add3(backward.normalize3());
offset = offset.normalize3();
// Compute the scalar triple product of the vector BC, the normal vector, and the offset
// vector to
// determine if the offset points to the left or the right of the control line.
double tripleProduct = perpendicular.dot3(offset);
if (tripleProduct < 0) {
offset = offset.multiply3(-1);
}
// Determine the length of the offset vector that will keep the left and right lines parallel
// to the control
// line.
Angle theta = backward.angleBetween3(offset);
if (!Angle.ZERO.equals(theta)) length = halfWidth / theta.sin();
else length = halfWidth;
} else {
offset = perpendicular.normalize3();
length = halfWidth;
}
offset = offset.multiply3(length);
// Determine the left and right points by applying the offset.
Vec4 ptRight = point.add3(offset);
Vec4 ptLeft = point.subtract3(offset);
// Convert cartesian points to geographic.
Position posLeft = globe.computePositionFromPoint(ptLeft);
Position posRight = globe.computePositionFromPoint(ptRight);
leftPositions.add(posLeft);
rightPositions.add(posRight);
}
/**
* Compute the label's screen position from its geographic position.
*
* @param dc Current draw context.
*/
protected void computeGeometry(DrawContext dc) {
// Project the label position onto the viewport
Position pos = this.getPosition();
if (pos == null) return;
this.placePoint = dc.computeTerrainPoint(pos.getLatitude(), pos.getLongitude(), 0);
this.screenPlacePoint = dc.getView().project(this.placePoint);
this.eyeDistance = this.placePoint.distanceTo3(dc.getView().getEyePoint());
boolean orientationReversed = false;
if (this.orientationPosition != null) {
// Project the orientation point onto the screen
Vec4 orientationPlacePoint =
dc.computeTerrainPoint(
this.orientationPosition.getLatitude(), this.orientationPosition.getLongitude(), 0);
Vec4 orientationScreenPoint = dc.getView().project(orientationPlacePoint);
this.rotation = this.computeRotation(this.screenPlacePoint, orientationScreenPoint);
// The orientation is reversed if the orientation point falls to the right of the screen
// point. Text is
// never drawn upside down, so when the orientation is reversed the text flips vertically to
// keep the text
// right side up.
orientationReversed = (orientationScreenPoint.x <= this.screenPlacePoint.x);
}
this.computeBoundsIfNeeded(dc);
Offset offset = this.getOffset();
Point2D offsetPoint =
offset.computeOffset(this.bounds.getWidth(), this.bounds.getHeight(), null, null);
// If a rotation is applied to the text, then rotate the offset as well. An offset in the x
// direction
// will move the text along the orientation line, and a offset in the y direction will move the
// text
// perpendicular to the orientation line.
if (this.rotation != null) {
double dy = offsetPoint.getY();
// If the orientation is reversed we need to adjust the vertical offset to compensate for the
// flipped
// text. For example, if the offset normally aligns the top of the text with the place point
// then without
// this adjustment the bottom of the text would align with the place point when the
// orientation is
// reversed.
if (orientationReversed) {
dy = -(dy + this.bounds.getHeight());
}
Vec4 pOffset = new Vec4(offsetPoint.getX(), dy);
Matrix rot = Matrix.fromRotationZ(this.rotation.multiply(-1));
pOffset = pOffset.transformBy3(rot);
offsetPoint = new Point((int) pOffset.getX(), (int) pOffset.getY());
}
int x = (int) (this.screenPlacePoint.x + offsetPoint.getX());
int y = (int) (this.screenPlacePoint.y - offsetPoint.getY());
this.screenPoint = new Point(x, y);
this.screenExtent = this.computeTextExtent(x, y, this.rotation);
}
protected void drawIcon(DrawContext dc) {
if (this.getIconFilePath() == null) return;
GL gl = dc.getGL();
OGLStackHandler ogsh = new OGLStackHandler();
try {
// Initialize texture if necessary
Texture iconTexture = dc.getTextureCache().getTexture(this.getIconFilePath());
if (iconTexture == null) {
this.initializeTexture(dc);
iconTexture = dc.getTextureCache().getTexture(this.getIconFilePath());
if (iconTexture == null) {
String msg = Logging.getMessage("generic.ImageReadFailed");
Logging.logger().finer(msg);
return;
}
}
gl.glDisable(GL.GL_DEPTH_TEST);
double width = this.getScaledIconWidth();
double height = this.getScaledIconHeight();
// Load a parallel projection with xy dimensions (viewportWidth, viewportHeight)
// into the GL projection matrix.
java.awt.Rectangle viewport = dc.getView().getViewport();
ogsh.pushProjectionIdentity(gl);
double maxwh = width > height ? width : height;
gl.glOrtho(0d, viewport.width, 0d, viewport.height, -0.6 * maxwh, 0.6 * maxwh);
// Translate and scale
ogsh.pushModelviewIdentity(gl);
double scale = this.computeScale(viewport);
Vec4 locationSW = this.computeLocation(viewport, scale);
gl.glTranslated(locationSW.x(), locationSW.y(), locationSW.z());
// Scale to 0..1 space
gl.glScaled(scale, scale, 1);
gl.glScaled(width, height, 1d);
if (!dc.isPickingMode()) {
gl.glEnable(GL.GL_BLEND);
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
// Draw background color behind the map
gl.glColor4ub(
(byte) this.backColor.getRed(),
(byte) this.backColor.getGreen(),
(byte) this.backColor.getBlue(),
(byte) (this.backColor.getAlpha() * this.getOpacity()));
dc.drawUnitQuad();
// Draw world map icon
gl.glColor4d(1d, 1d, 1d, this.getOpacity());
gl.glEnable(GL.GL_TEXTURE_2D);
iconTexture.bind();
TextureCoords texCoords = iconTexture.getImageTexCoords();
dc.drawUnitQuad(texCoords);
gl.glBindTexture(GL.GL_TEXTURE_2D, 0);
gl.glDisable(GL.GL_TEXTURE_2D);
// Draw crosshair for current location
gl.glLoadIdentity();
gl.glTranslated(locationSW.x(), locationSW.y(), locationSW.z());
// Scale to width x height space
gl.glScaled(scale, scale, 1);
// Set color
float[] colorRGB = this.color.getRGBColorComponents(null);
gl.glColor4d(colorRGB[0], colorRGB[1], colorRGB[2], this.getOpacity());
// Draw crosshair
Position groundPos = this.computeGroundPosition(dc, dc.getView());
if (groundPos != null) {
int x = (int) (width * (groundPos.getLongitude().degrees + 180) / 360);
int y = (int) (height * (groundPos.getLatitude().degrees + 90) / 180);
int w = 10; // cross branch length
// Draw
gl.glBegin(GL.GL_LINE_STRIP);
gl.glVertex3d(x - w, y, 0);
gl.glVertex3d(x + w + 1, y, 0);
gl.glEnd();
gl.glBegin(GL.GL_LINE_STRIP);
gl.glVertex3d(x, y - w, 0);
gl.glVertex3d(x, y + w + 1, 0);
gl.glEnd();
}
// Draw view footprint in map icon space
if (this.showFootprint) {
this.footPrintPositions = this.computeViewFootPrint(dc, 32);
if (this.footPrintPositions != null) {
gl.glBegin(GL.GL_LINE_STRIP);
LatLon p1 = this.footPrintPositions.get(0);
for (LatLon p2 : this.footPrintPositions) {
int x = (int) (width * (p2.getLongitude().degrees + 180) / 360);
int y = (int) (height * (p2.getLatitude().degrees + 90) / 180);
// Draw
if (LatLon.locationsCrossDateline(p1, p2)) {
int y1 = (int) (height * (p1.getLatitude().degrees + 90) / 180);
gl.glVertex3d(x < width / 2 ? width : 0, (y1 + y) / 2, 0);
gl.glEnd();
gl.glBegin(GL.GL_LINE_STRIP);
gl.glVertex3d(x < width / 2 ? 0 : width, (y1 + y) / 2, 0);
}
gl.glVertex3d(x, y, 0);
p1 = p2;
}
gl.glEnd();
}
}
// Draw 1px border around and inside the map
gl.glBegin(GL.GL_LINE_STRIP);
gl.glVertex3d(0, 0, 0);
gl.glVertex3d(width, 0, 0);
gl.glVertex3d(width, height - 1, 0);
gl.glVertex3d(0, height - 1, 0);
gl.glVertex3d(0, 0, 0);
gl.glEnd();
} else {
// Picking
this.pickSupport.clearPickList();
this.pickSupport.beginPicking(dc);
// Where in the world are we picking ?
Position pickPosition =
computePickPosition(
dc, locationSW, new Dimension((int) (width * scale), (int) (height * scale)));
Color color = dc.getUniquePickColor();
int colorCode = color.getRGB();
this.pickSupport.addPickableObject(colorCode, this, pickPosition, false);
gl.glColor3ub((byte) color.getRed(), (byte) color.getGreen(), (byte) color.getBlue());
dc.drawUnitQuad();
this.pickSupport.endPicking(dc);
this.pickSupport.resolvePick(dc, dc.getPickPoint(), this);
}
} finally {
dc.restoreDefaultDepthTesting();
dc.restoreDefaultCurrentColor();
if (dc.isPickingMode()) dc.restoreDefaultBlending();
ogsh.pop(gl);
}
}
/**
* Determine the positions that make up the arrowhead.
*
* @param dc Current draw context.
* @param startPosition Position of the arrow's base.
* @param endPosition Position of the arrow head tip.
* @return Positions that define the arrowhead.
*/
protected List<Position> computeArrowheadPositions(
DrawContext dc, Position startPosition, Position endPosition) {
Globe globe = dc.getGlobe();
// Arrowhead looks like this:
// _
// A\ | 1/2 width
// ________B\ _|
// Pt. 1 /
// C/
// | |
// Length
Vec4 p1 = globe.computePointFromPosition(startPosition);
Vec4 pB = globe.computePointFromPosition(endPosition);
// Find vector in the direction of the arrow
Vec4 vB1 = p1.subtract3(pB);
double arrowLengthFraction = this.getArrowLength();
// Find the point at the base of the arrowhead
Vec4 arrowBase = pB.add3(vB1.multiply3(arrowLengthFraction));
Vec4 normal = globe.computeSurfaceNormalAtPoint(arrowBase);
// Compute the length of the arrowhead
double arrowLength = vB1.getLength3() * arrowLengthFraction;
double arrowHalfWidth = arrowLength * this.getArrowAngle().tanHalfAngle();
// Compute a vector perpendicular to the segment and the normal vector
Vec4 perpendicular = vB1.cross3(normal);
perpendicular = perpendicular.normalize3().multiply3(arrowHalfWidth);
// Find points A and C
Vec4 pA = arrowBase.add3(perpendicular);
Vec4 pC = arrowBase.subtract3(perpendicular);
return TacticalGraphicUtil.asPositionList(globe, pA, pB, pC);
}
/**
* Compute the positions of the arrow head of the graphic's legs.
*
* @param dc Current draw context
* @param base Position of the arrow's starting point.
* @param tip Position of the arrow head tip.
* @param arrowLength Length of the arrowhead as a fraction of the total line length.
* @param arrowAngle Angle of the arrow head.
* @return Positions required to draw the arrow head.
*/
protected List<Position> computeArrowheadPositions(
DrawContext dc, Position base, Position tip, double arrowLength, Angle arrowAngle) {
// Build a triangle to represent the arrowhead. The triangle is built from two vectors, one
// parallel to the
// segment, and one perpendicular to it.
Globe globe = dc.getGlobe();
Vec4 ptA = globe.computePointFromPosition(base);
Vec4 ptB = globe.computePointFromPosition(tip);
// Compute parallel component
Vec4 parallel = ptA.subtract3(ptB);
Vec4 surfaceNormal = globe.computeSurfaceNormalAtPoint(ptB);
// Compute perpendicular component
Vec4 perpendicular = surfaceNormal.cross3(parallel);
double finalArrowLength = arrowLength * parallel.getLength3();
double arrowHalfWidth = finalArrowLength * arrowAngle.tanHalfAngle();
perpendicular = perpendicular.normalize3().multiply3(arrowHalfWidth);
parallel = parallel.normalize3().multiply3(finalArrowLength);
// Compute geometry of direction arrow
Vec4 vertex1 = ptB.add3(parallel).add3(perpendicular);
Vec4 vertex2 = ptB.add3(parallel).subtract3(perpendicular);
return TacticalGraphicUtil.asPositionList(globe, vertex1, vertex2, ptB);
}
// Rendering
public void draw(DrawContext dc) {
GL gl = dc.getGL();
boolean attribsPushed = false;
boolean modelviewPushed = false;
boolean projectionPushed = false;
try {
gl.glPushAttrib(
GL.GL_DEPTH_BUFFER_BIT
| GL.GL_COLOR_BUFFER_BIT
| GL.GL_ENABLE_BIT
| GL.GL_TEXTURE_BIT
| GL.GL_TRANSFORM_BIT
| GL.GL_VIEWPORT_BIT
| GL.GL_CURRENT_BIT);
attribsPushed = true;
gl.glDisable(GL.GL_TEXTURE_2D); // no textures
gl.glEnable(GL.GL_BLEND);
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
gl.glDisable(GL.GL_DEPTH_TEST);
double width = this.size.width;
double height = this.size.height;
// Load a parallel projection with xy dimensions (viewportWidth, viewportHeight)
// into the GL projection matrix.
java.awt.Rectangle viewport = dc.getView().getViewport();
gl.glMatrixMode(javax.media.opengl.GL.GL_PROJECTION);
gl.glPushMatrix();
projectionPushed = true;
gl.glLoadIdentity();
double maxwh = width > height ? width : height;
gl.glOrtho(0d, viewport.width, 0d, viewport.height, -0.6 * maxwh, 0.6 * maxwh);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glPushMatrix();
modelviewPushed = true;
gl.glLoadIdentity();
// Scale to a width x height space
// located at the proper position on screen
double scale = this.computeScale(viewport);
Vec4 locationSW = this.computeLocation(viewport, scale);
gl.glTranslated(locationSW.x(), locationSW.y(), locationSW.z());
gl.glScaled(scale, scale, 1);
// Compute scale size in real world
Position referencePosition = dc.getViewportCenterPosition();
if (referencePosition != null) {
Vec4 groundTarget = dc.getGlobe().computePointFromPosition(referencePosition);
Double distance = dc.getView().getEyePoint().distanceTo3(groundTarget);
this.pixelSize = dc.getView().computePixelSizeAtDistance(distance);
Double scaleSize = this.pixelSize * width * scale; // meter
String unitLabel = "m";
if (this.unit.equals(UNIT_METRIC)) {
if (scaleSize > 10000) {
scaleSize /= 1000;
unitLabel = "Km";
}
} else if (this.unit.equals(UNIT_IMPERIAL)) {
scaleSize *= 3.280839895; // feet
unitLabel = "ft";
if (scaleSize > 5280) {
scaleSize /= 5280;
unitLabel = "mile(s)";
}
}
// Rounded division size
int pot = (int) Math.floor(Math.log10(scaleSize));
if (!Double.isNaN(pot)) {
int digit = Integer.parseInt(String.format("%.0f", scaleSize).substring(0, 1));
double divSize = digit * Math.pow(10, pot);
if (digit >= 5) divSize = 5 * Math.pow(10, pot);
else if (digit >= 2) divSize = 2 * Math.pow(10, pot);
double divWidth = width * divSize / scaleSize;
// Draw scale
if (!dc.isPickingMode()) {
// Set color using current layer opacity
Color backColor = this.getBackgroundColor(this.color);
float[] colorRGB = backColor.getRGBColorComponents(null);
gl.glColor4d(
colorRGB[0],
colorRGB[1],
colorRGB[2],
(double) backColor.getAlpha() / 255d * this.getOpacity());
gl.glTranslated((width - divWidth) / 2, 0d, 0d);
this.drawScale(dc, divWidth, height);
colorRGB = this.color.getRGBColorComponents(null);
gl.glColor4d(colorRGB[0], colorRGB[1], colorRGB[2], this.getOpacity());
gl.glTranslated(-1d / scale, 1d / scale, 0d);
this.drawScale(dc, divWidth, height);
// Draw label
String label = String.format("%.0f ", divSize) + unitLabel;
gl.glLoadIdentity();
gl.glDisable(GL.GL_CULL_FACE);
drawLabel(
dc,
label,
locationSW.add3(
new Vec4(divWidth * scale / 2 + (width - divWidth) / 2, height * scale, 0)));
} else {
// Picking
this.pickSupport.clearPickList();
this.pickSupport.beginPicking(dc);
// Draw unique color across the map
Color color = dc.getUniquePickColor();
int colorCode = color.getRGB();
// Add our object(s) to the pickable list
this.pickSupport.addPickableObject(colorCode, this, referencePosition, false);
gl.glColor3ub((byte) color.getRed(), (byte) color.getGreen(), (byte) color.getBlue());
gl.glTranslated((width - divWidth) / 2, 0d, 0d);
this.drawRectangle(dc, divWidth, height);
// Done picking
this.pickSupport.endPicking(dc);
this.pickSupport.resolvePick(dc, dc.getPickPoint(), this);
}
}
}
} finally {
if (projectionPushed) {
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glPopMatrix();
}
if (modelviewPushed) {
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glPopMatrix();
}
if (attribsPushed) gl.glPopAttrib();
}
}