// Analysis disable once UnusedParameter
public bool RenderOrbit(RenderTexture screen, float cameraAspect)
{
if (!startupComplete || HighLogic.LoadedSceneIsEditor)
{
return(false);
}
// Make sure the parameters fit on the screen.
Vector4 displayPosition = orbitDisplayPosition;
displayPosition.z = Mathf.Min(screen.width - displayPosition.x, displayPosition.z);
displayPosition.w = Mathf.Min(screen.height - displayPosition.y, displayPosition.w);
// Here is our pixel budget in each direction:
double horizPixelSize = displayPosition.z - iconPixelSize;
double vertPixelSize = displayPosition.w - iconPixelSize;
// Find a basis for transforming values into the framework of
// vessel.orbit. The rendering framework assumes the periapsis
// is drawn directly to the right of the mainBody center of mass.
// It assumes the orbit's prograde direction is "up" (screen
// relative) at the periapsis, providing a counter-clockwise
// motion for vessel.
// Once we have the basic transform, we will add in scalars
// that will ultimately transform an arbitrary point (relative to
// the planet's center) into screen space.
Matrix4x4 screenTransform = Matrix4x4.identity;
double now = Planetarium.GetUniversalTime();
double timeAtPe = vessel.orbit.NextPeriapsisTime(now);
// Get the 3 direction vectors, based on Pe being on the right of the screen
// OrbitExtensions provides handy utilities to get these.
Vector3d right = vessel.orbit.Up(timeAtPe);
Vector3d forward = vessel.orbit.SwappedOrbitNormal();
// MOARdV: OrbitExtensions.Horizontal is unstable. I've seen it
// become (0, 0, 0) intermittently in flight. Instead, use the
// cross product of the other two.
// We flip the sign of this vector because we are using an inverted
// y coordinate system to keep the icons right-side up.
Vector3d up = -Vector3d.Cross(forward, right);
//Vector3d up = -vessel.orbit.Horizontal(timeAtPe);
screenTransform.SetRow(0, new Vector4d(right.x, right.y, right.z, 0.0));
screenTransform.SetRow(1, new Vector4d(up.x, up.y, up.z, 0.0));
screenTransform.SetRow(2, new Vector4d(forward.x, forward.y, forward.z, 0.0));
// Figure out our bounds. First, make sure the entire planet
// fits on the screen. We define the center of the vessel.mainBody
// as the origin of our coodinate system.
double maxX = vessel.mainBody.Radius;
double minX = -maxX;
double maxY = maxX;
double minY = -maxX;
if (vessel.mainBody.atmosphere)
{
maxX += vessel.mainBody.maxAtmosphereAltitude;
minX = -maxX;
maxY = maxX;
minY = -maxX;
}
// Now make sure the entire orbit fits on the screen.
Vector3 vesselPos;
// The PeR, ApR, and semiMinorAxis are all one dimensional, so we
// can just apply them directly to these values.
maxX = Math.Max(maxX, vessel.orbit.PeR);
if (vessel.orbit.eccentricity < 1.0)
{
minX = Math.Min(minX, -vessel.orbit.ApR);
maxY = Math.Max(maxY, vessel.orbit.semiMinorAxis);
minY = Math.Min(minY, -vessel.orbit.semiMinorAxis);
}
else if (vessel.orbit.EndUT > 0.0)
{
// If we're hyperbolic, let's get the SoI transition
vesselPos = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(vessel.orbit.EndUT));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
}
// Make sure the vessel shows up on-screen. Since a hyperbolic
// orbit doesn't have a meaningful ApR, we use this as a proxy for
// how far we need to extend the bounds to show the vessel.
vesselPos = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(now));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
// Account for a target vessel
var targetBody = FlightGlobals.fetch.VesselTarget as CelestialBody;
var targetVessel = FlightGlobals.fetch.VesselTarget as Vessel;
if (targetVessel != null && targetVessel.mainBody != vessel.mainBody)
{
// We only care about tgtVessel if it is in the same SoI.
targetVessel = null;
}
if (targetVessel != null && !targetVessel.LandedOrSplashed)
{
if (targetVessel.mainBody == vessel.mainBody)
{
double tgtPe = targetVessel.orbit.NextPeriapsisTime(now);
vesselPos = screenTransform.MultiplyPoint3x4(targetVessel.orbit.SwappedRelativePositionAtUT(tgtPe));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
if (targetVessel.orbit.eccentricity < 1.0)
{
vesselPos = screenTransform.MultiplyPoint3x4(targetVessel.orbit.SwappedRelativePositionAtUT(targetVessel.orbit.NextApoapsisTime(now)));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
}
vesselPos = screenTransform.MultiplyPoint3x4(targetVessel.orbit.SwappedRelativePositionAtUT(now));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
}
}
if (targetBody != null)
{
// Validate some values up front, so we don't need to test them later.
if (targetBody.GetOrbit() == null)
{
targetBody = null;
}
else if (targetBody.orbit.referenceBody == vessel.orbit.referenceBody)
{
// If the target body orbits our current world, let's at
// least make sure the body's location is visible.
vesselPos = screenTransform.MultiplyPoint3x4(targetBody.GetOrbit().SwappedRelativePositionAtUT(now));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
}
}
ManeuverNode node = (vessel.patchedConicSolver.maneuverNodes.Count > 0) ? vessel.patchedConicSolver.maneuverNodes[0] : null;
if (node != null)
{
double nodePe = node.nextPatch.NextPeriapsisTime(now);
vesselPos = screenTransform.MultiplyPoint3x4(node.nextPatch.SwappedRelativePositionAtUT(nodePe));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
if (node.nextPatch.eccentricity < 1.0)
{
double nodeAp = node.nextPatch.NextApoapsisTime(now);
vesselPos = screenTransform.MultiplyPoint3x4(node.nextPatch.SwappedRelativePositionAtUT(nodeAp));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
}
else if (node.nextPatch.EndUT > 0.0)
{
// If the next patch is hyperbolic, include the endpoint.
vesselPos = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(node.nextPatch.EndUT));
maxX = Math.Max(maxX, vesselPos.x);
minX = Math.Min(minX, vesselPos.x);
maxY = Math.Max(maxY, vesselPos.y);
minY = Math.Min(minY, vesselPos.y);
}
}
// Add translation. This will ensure that all of the features
// under consideration above will be displayed.
screenTransform[0, 3] = -0.5f * (float)(maxX + minX);
screenTransform[1, 3] = -0.5f * (float)(maxY + minY);
double neededWidth = maxX - minX;
double neededHeight = maxY - minY;
// Pick a scalar that will fit the bounding box we just created.
float pixelScalar = (float)Math.Min(horizPixelSize / neededWidth, vertPixelSize / neededHeight);
screenTransform = Matrix4x4.Scale(new Vector3(pixelScalar, pixelScalar, pixelScalar)) * screenTransform;
GL.Clear(true, true, backgroundColorValue);
GL.PushMatrix();
GL.LoadPixelMatrix(-displayPosition.z * 0.5f, displayPosition.z * 0.5f, displayPosition.w * 0.5f, -displayPosition.w * 0.5f);
GL.Viewport(new Rect(displayPosition.x, screen.height - displayPosition.y - displayPosition.w, displayPosition.z, displayPosition.w));
lineMaterial.SetPass(0);
GL.Begin(GL.LINES);
// Draw the planet:
Vector3 focusCenter = screenTransform.MultiplyPoint3x4(new Vector3(0.0f, 0.0f, 0.0f));
// orbitDriver is null on the sun, so we'll just use white instead.
GL.Color((vessel.mainBody.orbitDriver == null) ? new Color(1.0f, 1.0f, 1.0f) : vessel.mainBody.orbitDriver.orbitColor);
DrawCircle(focusCenter.x, focusCenter.y, (float)(vessel.mainBody.Radius * pixelScalar), orbitPoints);
if (vessel.mainBody.atmosphere)
{
// Use the atmospheric ambient to color the atmosphere circle.
GL.Color(vessel.mainBody.atmosphericAmbientColor);
DrawCircle(focusCenter.x, focusCenter.y, (float)((vessel.mainBody.Radius + vessel.mainBody.maxAtmosphereAltitude) * pixelScalar), orbitPoints);
}
if (targetVessel != null && !targetVessel.LandedOrSplashed)
{
GL.Color(iconColorTargetValue);
if (!targetVessel.orbit.activePatch && targetVessel.orbit.eccentricity < 1.0 && targetVessel.orbit.referenceBody == vessel.orbit.referenceBody)
{
// For some reason, activePatch is false for targetVessel.
// If we have a stable orbit for the target, use a fallback
// rendering method:
ReallyDrawOrbit(targetVessel.orbit, vessel.orbit.referenceBody, screenTransform, orbitPoints);
}
else
{
DrawOrbit(targetVessel.orbit, vessel.orbit.referenceBody, screenTransform, orbitPoints);
}
}
foreach (CelestialBody moon in vessel.orbit.referenceBody.orbitingBodies)
{
if (moon != targetBody)
{
GL.Color(moon.orbitDriver.orbitColor);
ReallyDrawOrbit(moon.GetOrbit(), vessel.orbit.referenceBody, screenTransform, orbitPoints);
}
}
if (targetBody != null)
{
GL.Color(iconColorTargetValue);
ReallyDrawOrbit(targetBody.GetOrbit(), vessel.orbit.referenceBody, screenTransform, orbitPoints);
}
if (node != null)
{
GL.Color(orbitColorNextNodeValue);
DrawOrbit(node.nextPatch, vessel.orbit.referenceBody, screenTransform, orbitPoints);
}
if (vessel.orbit.nextPatch != null && vessel.orbit.nextPatch.activePatch)
{
GL.Color(orbitColorNextNodeValue);
DrawOrbit(vessel.orbit.nextPatch, vessel.orbit.referenceBody, screenTransform, orbitPoints);
}
// Draw the vessel orbit
GL.Color(orbitColorSelfValue);
DrawOrbit(vessel.orbit, vessel.orbit.referenceBody, screenTransform, orbitPoints);
// Done drawing lines. Reset color to white, so we don't mess up anyone else.
GL.Color(Color.white);
GL.End();
// Draw target vessel icons.
Vector3 transformedPosition;
foreach (CelestialBody moon in vessel.orbit.referenceBody.orbitingBodies)
{
if (moon != targetBody)
{
transformedPosition = screenTransform.MultiplyPoint3x4(moon.getTruePositionAtUT(now) - vessel.orbit.referenceBody.getTruePositionAtUT(now));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, moon.orbitDriver.orbitColor, MapIcons.OtherIcon.PLANET);
}
}
if (targetVessel != null || targetBody != null)
{
var orbit = (targetVessel != null) ? targetVessel.GetOrbit() : targetBody.GetOrbit();
double tClosestApproach, dClosestApproach;
if (targetVessel != null && targetVessel.LandedOrSplashed)
{
orbit = JUtil.ClosestApproachSrfOrbit(vessel.orbit, targetVessel, out tClosestApproach, out dClosestApproach);
}
else
{
dClosestApproach = JUtil.GetClosestApproach(vessel.orbit, orbit, out tClosestApproach);
DrawNextPe(orbit, vessel.orbit.referenceBody, now, iconColorTargetValue, screenTransform);
DrawNextAp(orbit, vessel.orbit.referenceBody, now, iconColorTargetValue, screenTransform);
}
if (targetBody != null)
{
transformedPosition = screenTransform.MultiplyPoint3x4(targetBody.getTruePositionAtUT(now) - vessel.orbit.referenceBody.getTruePositionAtUT(now));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, iconColorTargetValue, MapIcons.OtherIcon.PLANET);
}
else
{
transformedPosition = screenTransform.MultiplyPoint3x4(orbit.SwappedRelativePositionAtUT(now));
DrawIcon(transformedPosition.x, transformedPosition.y, targetVessel.vesselType, iconColorTargetValue);
}
if (vessel.orbit.AscendingNodeExists(orbit))
{
double anTime = vessel.orbit.TimeOfAscendingNode(orbit, now);
if (anTime < vessel.orbit.EndUT || (vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ESCAPE && vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ENCOUNTER))
{
transformedPosition = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(anTime));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, orbitColorSelfValue, MapIcons.OtherIcon.AN);
}
}
if (vessel.orbit.DescendingNodeExists(orbit))
{
double dnTime = vessel.orbit.TimeOfDescendingNode(orbit, now);
if (dnTime < vessel.orbit.EndUT || (vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ESCAPE && vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ENCOUNTER))
{
transformedPosition = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(dnTime));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, orbitColorSelfValue, MapIcons.OtherIcon.DN);
}
}
Orbit o = GetPatchAtUT(vessel.orbit, tClosestApproach);
if (o != null)
{
Vector3d encounterPosition = o.SwappedRelativePositionAtUT(tClosestApproach) + o.referenceBody.getTruePositionAtUT(tClosestApproach) - vessel.orbit.referenceBody.getTruePositionAtUT(tClosestApproach);
transformedPosition = screenTransform.MultiplyPoint3x4(encounterPosition);
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, iconColorClosestApproachValue, MapIcons.OtherIcon.SHIPATINTERCEPT);
}
// Unconditionally try to draw the closest approach point on
// the target orbit.
transformedPosition = screenTransform.MultiplyPoint3x4(orbit.SwappedRelativePositionAtUT(tClosestApproach));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, iconColorClosestApproachValue, MapIcons.OtherIcon.TGTATINTERCEPT);
}
else
{
if (vessel.orbit.AscendingNodeEquatorialExists())
{
double anTime = vessel.orbit.TimeOfAscendingNodeEquatorial(now);
if (anTime < vessel.orbit.EndUT || (vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ESCAPE && vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ENCOUNTER))
{
transformedPosition = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(anTime));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, orbitColorSelfValue, MapIcons.OtherIcon.AN);
}
}
if (vessel.orbit.DescendingNodeEquatorialExists())
{
double dnTime = vessel.orbit.TimeOfDescendingNodeEquatorial(now);
if (dnTime < vessel.orbit.EndUT || (vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ESCAPE && vessel.orbit.patchEndTransition != Orbit.PatchTransitionType.ENCOUNTER))
{
transformedPosition = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(dnTime));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, orbitColorSelfValue, MapIcons.OtherIcon.DN);
}
}
}
// Draw orbital features
DrawNextPe(vessel.orbit, vessel.orbit.referenceBody, now, iconColorPEValue, screenTransform);
DrawNextAp(vessel.orbit, vessel.orbit.referenceBody, now, iconColorAPValue, screenTransform);
if (vessel.orbit.nextPatch != null && vessel.orbit.nextPatch.activePatch)
{
transformedPosition = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(vessel.orbit.EndUT));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, orbitColorSelfValue, MapIcons.OtherIcon.EXITSOI);
Orbit nextPatch = vessel.orbit.nextPatch.nextPatch;
if (nextPatch != null && nextPatch.activePatch)
{
transformedPosition = screenTransform.MultiplyPoint3x4(nextPatch.SwappedRelativePositionAtUT(nextPatch.EndUT) + nextPatch.referenceBody.getTruePositionAtUT(nextPatch.EndUT) - vessel.orbit.referenceBody.getTruePositionAtUT(nextPatch.EndUT));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, orbitColorNextNodeValue, MapIcons.OtherIcon.EXITSOI);
}
}
if (node != null && node.nextPatch.activePatch)
{
DrawNextPe(node.nextPatch, vessel.orbit.referenceBody, now, orbitColorNextNodeValue, screenTransform);
DrawNextAp(node.nextPatch, vessel.orbit.referenceBody, now, orbitColorNextNodeValue, screenTransform);
transformedPosition = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(node.UT));
DrawIcon(transformedPosition.x, transformedPosition.y, VesselType.Unknown, orbitColorNextNodeValue, MapIcons.OtherIcon.NODE);
}
// Draw ownship icon
transformedPosition = screenTransform.MultiplyPoint3x4(vessel.orbit.SwappedRelativePositionAtUT(now));
DrawIcon(transformedPosition.x, transformedPosition.y, vessel.vesselType, iconColorSelfValue);
GL.PopMatrix();
GL.Viewport(new Rect(0, 0, screen.width, screen.height));
return(true);
}
