Parabola

Syntax:

    Parabola (x,  y,  p_factor,  type, modestop, optional LineColour=GLCDForeground)

Explanation:

Draws on a GLCD a parabola with equation y^2=2*p_factor*x, centered at pixel positions (x, y) .

The parabola is an unbounded curve.

The parabola can be alined either along the x axis or along the y axis.

Drawing parabola on the screen can be constrained by following two different criteria: - a branch has reached a border of the display. - both branches have reached the display border.

For a parabola centered on the display these criteria are equivalent.

Input parameters:

Parameter Controls

x, y

X, Y coordinates of the parabola vertex. X is the minimum x value of the parabola when alined along X. Y is the minimum y value of the parabola when alined along y   in pixel positions

The x or y coordinates are Word value, p_factor is word value, type and ModeStop are byte values .

p_factor

The factor such that y^2=2*p_factor*x is the equation of the parabola

type

type=1 the parabola is aligned along x axis
type=2 the parabola is aligned along y axis

modestop

modestop=1 drawing stops when a display border is encountered by a parabola branch.
modestop=2 drawing stops when all the parabolla branches encountered a border

LineColour

Color of the parabola

Example:

    'Example for a 240x320 pixels GLCD

    #include <glcd.h>

    Parabola(120, 160, 20, 1, 2, GLCDForeground)   ;  centered, p_factor=20, x_axis alined, stops when all branches have reached a a border
    Parabola(120, 160 ,20, 1, 1, GLCDForeground)   ; centered, p_factor=20, x_axis alined, stops when a border is reached
    Parabola(120, 160, 20, 2, 1, GLCDForeground)   ; centered, p_factor=20, y_axis alined, stops when a border is reached,

    Parabola(180, 80, 20, 1, 1, GLCDForeground)   ; upper right, p_factor=20, x_axis alined, stops when a border is touched,
    Parabola(60, 240, 20, 1, 2, GLCDForeground)   ; lower left, p_factor=20, x_axis alined, stops when all branches have reached a border

    Parabola(180, 80, 20, 2, 1, GLCDForeground)   ; upper right, p_factor=20, y_axis alined, stops when a border is touched,
    Parabola(60, 240, 20, 2, 2, GLCDForeground)   ; lower left, p_factor=20, y_axis alined, stops when all branches have reached a border
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