public void focusOnTerrainCenter()
{
if (this.dc == null)
{
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
if (this.globe == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGlobeIsNull");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
if (this.dc.getSurfaceGeometry() == null)
{
return;
}
if (isAnimating())
{
return;
}
Matrix modelview = OrbitViewInputSupport.computeTransformMatrix(this.globe,
this.center, this.heading, this.pitch, this.roll, this.zoom);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
// The change in focus must happen seamlessly; we can't move the eye or the forward vector
// (only the center position and zoom should change).
Vec4 eyePoint = Vec4.UNIT_W.transformBy4(modelviewInv);
Vec4 forward = Vec4.UNIT_NEGATIVE_Z.transformBy4(modelviewInv);
Intersection[] intersections = this.dc.getSurfaceGeometry().intersect(new Line(eyePoint, forward));
if (intersections != null && intersections.Length > 0)
{
Vec4 viewportCenterPoint = intersections[0].getIntersectionPoint();
OrbitViewInputSupport.OrbitViewState modelCoords = OrbitViewInputSupport.computeOrbitViewState(
this.globe, modelview, viewportCenterPoint);
if (validateModelCoordinates(modelCoords))
{
setModelCoordinates(modelCoords);
}
}
}
}
}
private Matrix getModelviewInverse(Globe globe,
Position centerPosition, Angle heading, Angle pitch, Angle roll, double zoom)
{
if (globe != null && centerPosition != null && heading != null && pitch != null)
{
Matrix modelview = OrbitViewInputSupport.computeTransformMatrix(globe,
centerPosition, heading, pitch, roll, zoom);
if (modelview != null)
{
return(modelview.getInverse());
}
}
return(null);
}
public Vec4 getCurrentEyePoint()
{
if (this.globe != null)
{
Matrix modelview = OrbitViewInputSupport.computeTransformMatrix(this.globe, this.center,
this.heading, this.pitch, this.roll, this.zoom);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
return(Vec4.UNIT_W.transformBy4(modelviewInv));
}
}
}
return(Vec4.ZERO);
}
public Position getCurrentEyePosition()
{
if (this.globe != null)
{
Matrix modelview = OrbitViewInputSupport.computeTransformMatrix(this.globe, this.center,
this.heading, this.pitch, this.roll, this.zoom);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
Vec4 eyePoint = Vec4.UNIT_W.transformBy4(modelviewInv);
return(this.globe.computePositionFromPoint(eyePoint));
}
}
}
return(Position.ZERO);
}
protected void doApply(DrawContext dc)
{
if (dc == null)
{
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (dc.getGL() == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGLIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (dc.getGlobe() == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGlobeIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
// Update the draw context and the globe, then re-apply the current view property limits. Apply view property
// limits after updating the globe so that globe-specific property limits are applied correctly.
this.dc = dc;
this.globe = this.dc.getGlobe();
this.center = this.getOrbitViewLimits().limitCenterPosition(this, this.center);
this.heading = this.getOrbitViewLimits().limitHeading(this, this.heading);
this.pitch = this.getOrbitViewLimits().limitPitch(this, this.pitch);
this.roll = this.getOrbitViewLimits().limitRoll(this, this.roll);
this.zoom = this.getOrbitViewLimits().limitZoom(this, this.zoom);
//========== modelview matrix state ==========//
// Compute the current modelview matrix.
this.modelview = OrbitViewInputSupport.computeTransformMatrix(this.globe, this.center,
this.heading, this.pitch, this.roll, this.zoom);
if (this.modelview == null)
{
this.modelview = Matrix.IDENTITY;
}
// Compute the current inverse-modelview matrix.
this.modelviewInv = this.modelview.getInverse();
if (this.modelviewInv == null)
{
this.modelviewInv = Matrix.IDENTITY;
}
//========== projection matrix state ==========//
// Get the current OpenGL viewport state.
int[] viewportArray = new int[4];
this.dc.getGL().gl2.GetInteger(OpenGL.GL_VIEWPORT, 0, viewportArray);
// this.dc.getGL().glGetIntegerv(OpenGL.GL_VIEWPORT, viewportArray, 0);
this.viewport = new Rectangle(viewportArray[0], viewportArray[1], viewportArray[2], viewportArray[3]);
// Compute the current clip plane distances. The near distance depends on the far distance, so we must compute
// the far distance first.
this.farClipDistance = computeFarClipDistance();
this.nearClipDistance = computeNearClipDistance();
// Compute the current viewport dimensions.
double viewportWidth = this.viewport.getWidth() <= 0.0 ? 1.0 : this.viewport.getWidth();
double viewportHeight = this.viewport.getHeight() <= 0.0 ? 1.0 : this.viewport.getHeight();
// Compute the current projection matrix.
this.projection = Matrix.fromPerspective(this.fieldOfView,
viewportWidth, viewportHeight,
this.nearClipDistance, this.farClipDistance);
// Compute the current frustum.
this.frustum = Frustum.fromPerspective(this.fieldOfView,
(int)viewportWidth, (int)viewportHeight,
this.nearClipDistance, this.farClipDistance);
//========== load GL matrix state ==========//
loadGLViewState(dc, this.modelview, this.projection);
//========== after apply (GL matrix state) ==========//
afterDoApply();
}
public void setOrientation(Position eyePosition, Position centerPosition)
{
if (eyePosition == null || centerPosition == null)
{
String message = Logging.getMessage("nullValue.PositionIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (this.globe == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGlobeIsNull");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
Vec4 newEyePoint = this.globe.computePointFromPosition(eyePosition);
Vec4 newCenterPoint = this.globe.computePointFromPosition(centerPosition);
if (newEyePoint == null || newCenterPoint == null)
{
String message = Logging.getMessage("View.ErrorSettingOrientation", eyePosition, centerPosition);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
// If eye lat/lon != center lat/lon, then the surface normal at the center point will be a good value
// for the up direction.
Vec4 up = this.globe.computeSurfaceNormalAtPoint(newCenterPoint);
// Otherwise, estimate the up direction by using the *current* heading with the new center position.
Vec4 forward = newCenterPoint.subtract3(newEyePoint).normalize3();
if (forward.cross3(up).getLength3() < 0.001)
{
Matrix modelview = OrbitViewInputSupport.computeTransformMatrix(
this.globe, centerPosition, this.heading, Angle.ZERO, Angle.ZERO, 1);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
up = Vec4.UNIT_Y.transformBy4(modelviewInv);
}
}
}
if (up == null)
{
String message = Logging.getMessage("View.ErrorSettingOrientation", eyePosition, centerPosition);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
OrbitViewInputSupport.OrbitViewState modelCoords = OrbitViewInputSupport.computeOrbitViewState(
this.globe, newEyePoint, newCenterPoint, up);
if (!validateModelCoordinates(modelCoords))
{
String message = Logging.getMessage("View.ErrorSettingOrientation", eyePosition, centerPosition);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
setModelCoordinates(modelCoords);
}
/** Sets the point of rotation for heading and pitch changes to the surface position at the viewport center. */
public void focusOnViewportCenter()
{
if (this.isAnimating())
{
return;
}
if (this.dc == null)
{
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
if (this.globe == null)
{
String message = Logging.getMessage("nullValue.DrawingContextGlobeIsNull");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
Position viewportCenterPos = this.dc.getViewportCenterPosition();
if (viewportCenterPos == null)
{
String message = Logging.getMessage("nullValue.DrawingContextViewportCenterIsNull");
Logging.logger().severe(message);
throw new IllegalStateException(message);
}
// We want the actual "geometric point" here, which must be adjusted for vertical exaggeration.
Vec4 viewportCenterPoint = this.globe.computePointFromPosition(
viewportCenterPos.getLatitude(), viewportCenterPos.getLongitude(),
this.globe.getElevation(viewportCenterPos.getLatitude(), viewportCenterPos.getLongitude())
* dc.getVerticalExaggeration());
if (viewportCenterPoint != null)
{
Matrix modelview = OrbitViewInputSupport.computeTransformMatrix(this.globe,
this.center, this.heading, this.pitch, this.roll, this.zoom);
if (modelview != null)
{
Matrix modelviewInv = modelview.getInverse();
if (modelviewInv != null)
{
// The change in focus must happen seamlessly; we can't move the eye or the forward vector
// (only the center position and zoom should change). Therefore we pick a point along the
// forward vector, and *near* the viewportCenterPoint, but not necessarily at the
// viewportCenterPoint itself.
Vec4 eyePoint = Vec4.UNIT_W.transformBy4(modelviewInv);
Vec4 forward = Vec4.UNIT_NEGATIVE_Z.transformBy4(modelviewInv);
double distance = eyePoint.distanceTo3(viewportCenterPoint);
Vec4 newCenterPoint = Vec4.fromLine3(eyePoint, distance, forward);
OrbitViewInputSupport.OrbitViewState modelCoords = OrbitViewInputSupport.computeOrbitViewState(
this.globe, modelview, newCenterPoint);
if (validateModelCoordinates(modelCoords))
{
setModelCoordinates(modelCoords);
}
}
}
}
}
