Hp Prime Graphing Wireless Calculator Uživatelský manuál stáhnout pdf (Strana 281)

Programming in HP PPL 277

Drawing

There are 10 built-in graphics variables in the HP Prime,

called G0–G9. G0 is always the current screen graphic.

G1 to G9 can be used to store temporary graphic objects

(called GROBs for short) when programming applications

that use graphics. They are temporary and thus cleared

when the calculator turns off.

Twenty-six functions can be used to modify graphics

variables. Thirteen of them work with Cartesian

coordinates using the Cartesian plane defined in the

current app by the variables Xmin, Xmax, Ymin, and

Ymax.

The remaining thirteen work with pixel coordinates where

the pixel 0,0 is the top left pixel of the GROB, and 320,

240 is the bottom right. Functions in this second set have

a _P suffix to the function name.

C→PX Converts from Cartesian coordinates to screen coordinates.

Syntax: C

→

PX(x,y) or C

→

PX({x,y})

DRAWMENU Syntax: DRAWMENU(string1, string2,…

string6)

Draws a six-button menu at the bottom of the display, with

labels string1, string2, …, string6.

Example:

DRAWMENU("ABC", "", "DEF") creates a menu with

the first and third buttons labelled ABC and DEF,

respectively. The other four menu keys are blank.

FREEZE Syntax: FREEZE

Pauses program execution until a key is pressed. This

prevents the screen from being redrawn after the end of

the program execution, leaving the modified display on

the screen for the user to see.

PX→C Converts from screen coordinates to Cartesian

coordinates.

RGB Syntax: RGB(R, G, B, [A])

1 2 ... 276 277 278 279 280 281 282 283 284 285 286 ... 333 334

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Hp Prime Graphing Wireless Calculator Uživatelský manuál Strana 281