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--Bent Arc Particle
local finalMagnitude = parameters["BentArcFinalMagnitude"]
local velocity = parameters["BentArcVelocity"]
local AzimuthStartRadians = parameters["BentArcAzimuthStartRadians"]
local ElevationStartRadians = parameters["BentArcElevationStartRadians"]
local AzimuthChangeRadians = parameters["BentArcAzimuthChangeRadians"]
local ElevationChangeRadians = parameters["BentArcElevationChangeRadians"]
local magnitude
if finalMagnitude then
local magnitudeProgress = progress
end
elseif velocity then
end
local bendProgress = progress
end
local AzimuthRadians = zo_lerp(AzimuthStartRadians, AzimuthStartRadians + AzimuthChangeRadians, bendProgress)
local ElevationRadians = zo_lerp(ElevationStartRadians, ElevationStartRadians + ElevationChangeRadians, bendProgress)
--Spherical coordinates to Cartesian
--X is right, Y is up, Z is toward the screen
return x, y, z
end
end
end
--Control particles expect that Y is down
end
end
-- Physics Particle
end
local MAX_ACCELERATIONS = 5
local ACCELERATION_ELEVATION_RADIANS_PARAMETER_NAMES = {}
local ACCELERATION_MAGNITUDE_PARAMETER_NAMES = {}
for accelerationIndex = 1, MAX_ACCELERATIONS do
table.insert(ACCELERATION_ELEVATION_RADIANS_PARAMETER_NAMES, "PhysicsAccelerationElevationRadians" .. accelerationIndex)
table.insert(ACCELERATION_MAGNITUDE_PARAMETER_NAMES, "PhysicsAccelerationMagnitude" .. accelerationIndex)
end
local initialVelocityElevationRadians = parameters["PhysicsInitialVelocityElevationRadians"]
if initialVelocityElevationRadians then
local initialVelocityMagnitude = parameters["PhysicsInitialVelocityMagnitude"]
if initialVelocityMagnitude then
end
end
local combinedAccelerationX = 0
local combinedAccelerationY = 0
for accelerationIndex = 1, MAX_ACCELERATIONS do
local accelerationElevationRadians = parameters[ACCELERATION_ELEVATION_RADIANS_PARAMETER_NAMES[accelerationIndex]]
if not accelerationElevationRadians then
break
end
local accelerationMagnitude = parameters[ACCELERATION_MAGNITUDE_PARAMETER_NAMES[accelerationIndex]]
if not accelerationMagnitude then
break
end
combinedAccelerationX = combinedAccelerationX + accelerationX
combinedAccelerationY = combinedAccelerationY + accelerationY
end
end
--Numerical can do complex calculations like drag, but it does so by doing calculations in intervals, since it's not a simple equation of time
end
do
local DEFAULT_MIN_STEPS_PER_SECOND = 30
local MAX_STEPS_FOR_UPDATE = 10
local minStepsPerSecond = parameters["PhysicsMinStepsPerSecond"] or DEFAULT_MIN_STEPS_PER_SECOND
end
local timeSinceLastUpdateS = timeS - lastUpdateTimeS
if timeSinceLastUpdateS < stepsIntervalS then
stepsIntervalS = timeSinceLastUpdateS
-- If we've hit a long spike since the last update, split the delta into equal intervals looping up to MAX_STEPS_FOR_UPDATE times to catch up
stepsIntervalS = timeSinceLastUpdateS / MAX_STEPS_FOR_UPDATE
end
repeat
local dragVelocityChangeX = velocityX * dragMultiplier * stepsIntervalS
local dragVelocityChangeY = velocityY * dragMultiplier * stepsIntervalS
velocityX = velocityX + velocityChangePerStepX - dragVelocityChangeX
velocityY = velocityY + velocityChangePerStepY - dragVelocityChangeY
----------------------------------------------------------------------
displacementX = displacementX + (velocityX * stepsIntervalS)
displacementY = displacementY + (velocityY * stepsIntervalS)
lastUpdateTimeS = lastUpdateTimeS + stepsIntervalS
until (lastUpdateTimeS + stepsIntervalS) > timeS
--Control particles expect that Y is down
end
end
--Analytical calculates physics as a direct equation of elapsed time. Does not support complex functionality like drag
end
--Control particles expect that Y is down
end
--Stationary Paricle
end
-- Offset is handled in the base update, and SetPosition takes that into consideration
end
--Leaf Particle
--A leaf like motion to the right and down from the origin, based on following sections of a tangent curve. Specify the top and bottom (y-values) and the leaf will move through that
--section of the tangent curve. Descent is a factor on the tangent curve (0, infinity). Higher descents make a steeper curve, while lower descents mean a gentler curve. Fall height is the
--UI space height that the curve will be mapped to. The code that orients the leaf to the direction of travel assumes that the leaf point is a 0 degrees on the unit circle. If that is not true
--it can be corrected by rotating the leaf using LeafTextureRotationRadians.
end
--Inverse of y = -descent * tan(x)
end
end
end
local sectionTopY = parameters["LeafSectionTop"]
local sectionBottomY = parameters["LeafSectionBottom"]
local descent = parameters["LeafDescent"]
local sectionHeight = sectionTopY - sectionBottomY
local fallHeight = parameters["LeafFallHeight"]
local leafTextureRotationRadians = parameters["LeafTextureRotationRadians"]
--We move linearly from 0 to fallHeight along the Y (This means that the more the curve travels in the X the faster it goes through that section. It is not constant velocity).
local offsetY = fallHeight * progress
--Figure out where we are vertically on the section of the tangent curve
--Find the X the corresponds to that Y
--Convert that to an offset from the starting X value
--Finally, scale this offset to UI coordinates using the correspondence between the section height and the fall height to determine the scaling factor
local offsetX = (sectionOffsetX / sectionHeight) * fallHeight
--The derivative of -descent * tan(x) is -descent/cos^2(x). Orient the texture 0 radian point to the direction of travel.
local slope = -descent / (cosSectionX * cosSectionX)
local tumbleRadians = parameters["LeafTumbleRadians"]
self.textureControl:SetTextureRotation(math.atan(slope) + leafTextureRotationRadians + tumbleRadians * progress)
end |