Hp Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 292)

288 Programming in HP PPL

Note that {Color, [Alpha], triangle_1, ..., triangle_n} is

also a valid form to avoid respecifying the same color for

each triangle.

rotation_matrix is a matrix between sizes 2*2 to 3*4 that

specifies the rotation and translation of the point using

usual 3D and 4D geometry.

{eye_x, eye_y, eye_z} defines the eye position

(projection).

{3Dxmin, 3Dxmax, 3Dymin, 3Dymax, 3Dzmin, 3Dzmax}

is used to perform 3D clipping on the pretransformed

objects.

Each point is rotated and translated through a

multiplication by the rotation_matrix. It is then projected

on the view plan using the eye position calculated by the

following equation: x=eye_z/z*x-eye_x and y=eye_z/

z*y-eye_y.

Each triangle is clipped in 3D, if 3D clipping data is

provided.

If "N" is specified, the Z coordinates are normalized

between 0 and 255 after rotation, providing easier

zClipping.

If zstring is provided, per pixel z clipping happens using

the z value string (see the following).

TRIANGLE_P returns a string which contains all the

transformed points. If you plan to call TRIANGLE or LINE

multiple times in a row using the same points and

transformation, you can do so by replacing the

points_definition with this string and omitting the

transformation definition in subsequent calls to TRIANGLE

and LINE.

About zstring:

TRIANGLE_P([G]) returns a string adapted for z clipping.

To use z clipping, call TRIANGLE_P to create a z clipping

string (initialized at 255 for each pixels). You can then call

TRIANGLE_P with appropriate z (0-255) values for each

of the triangle vertices and TRIANGLE_P will not draw

pixels farther than the already drawn pixels. ZString is

automatically updated as appropriate.

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Hp Prime Graphing Wireless Calculator Instrukcja Użytkownika Strona 292