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BezierCurve

BezierCurve​

Description

A bezier curve for smooth animations. Implicitly treats P0 and P3 as 0,0 and 1,1 respectively, and allows for 1 dimensional sampling.

Functions

recalculateCoefficients​

Description

Recalculates the coefficients based on the positions.

Definition

recalculateCoefficients()

Code

function BezierCurve:recalculateCoefficients()
    self.cx = 3 * self.positionX1
    self.bx = 3 * ( self.positionX2 - self.positionX1) - self.cx
    self.ax = 1 - self.cx - self.bx

    self.cy = 3 * self.positionY1
    self.by = 3 * ( self.positionY2 - self.positionY1) - self.cy
    self.ay = 1 - self.cy - self.by
end

setPositionX1​

Description

Sets the position X 1 value to the given value, clamped between 0 and 1.

Definition

setPositionX1(float newValue)

Arguments

floatnewValueThe new value to use. Will be clamped between 0 and 1.

Code

function BezierCurve:setPositionX1(newValue)
    --#debug Assert.isType(newValue, "number", "Position X 1 must be a number")
    self.positionX1 = math.clamp(newValue, 0 , 1 )
    self:recalculateCoefficients()
end

setPositionX2​

Description

Sets the position X 2 value to the given value, clamped between 0 and 1.

Definition

setPositionX2(float newValue)

Arguments

floatnewValueThe new value to use. Will be clamped between 0 and 1.

Code

function BezierCurve:setPositionX2(newValue)
    --#debug Assert.isType(newValue, "number", "Position X 2 must be a number")
    self.positionX2 = math.clamp(newValue, 0 , 1 )
    self:recalculateCoefficients()
end

setPositionY1​

Description

Sets the position Y 1 value to the given value.

Definition

setPositionY1(float newValue)

Arguments

floatnewValueThe new value to use.

Code

function BezierCurve:setPositionY1(newValue)
    --#debug Assert.isType(newValue, "number", "Position Y 1 must be a number")
    self.positionY1 = math.clamp(newValue, 0 , 1 )
    self:recalculateCoefficients()
end

setPositionY2​

Description

Sets the position Y 2 value to the given value.

Definition

setPositionY2(float newValue)

Arguments

floatnewValueThe new value to use.

Code

function BezierCurve:setPositionY2(newValue)
    --#debug Assert.isType(newValue, "number", "Position Y 2 must be a number")
    self.positionY2 = math.clamp(newValue, 0 , 1 )
    self:recalculateCoefficients()
end