HP Prime: Pentcolor Demonstration

HP Prime: Pentcolor Demonstration

Introduction

The HP Prime program PENTCOLOR allows the cycler to through colors with the touch of the following buttons:

Key [ 1 ]:  Red

Key [ 2 ]:  Green

Key [ 3 ]:  Blue

Each color setting cycles through the values of 0, 64, 128, 192, and 255.  Exit the program with the Escape key ( [ Esc ] ).  This program allows the user to cycle through different colors using RGB values.

 I use two subroutines in PENTCOLOR.  The first draws the text every time the key is selected, which allows for crisp text.   The second is for value calculation.  In subroutines on the HP Prime, all variables that are used must be local.  Global variables are passed through the subroutine arguments.  

HP Prime Program:  PENTCOLOR

SBR1(); // sub routine text

// allows for crisp text

SBR2(); // sub routine calc

// saves space in main program

// main program

EXPORT PENTCOLOR()

BEGIN

// EWS 2018-05-07

LOCAL K,R,G,B;

// R,G,B are set at 0

RECT();

TEXTOUT_P("Ready! 1. Red,

2. Green, 3. Blue",0,20,4);

REPEAT

K:=GETKEY;

// Key 1, red

IF K==42 THEN

RECT();

R:=SBR2(R);

SBR1(R,G,B);

END;

// Key 2, green

IF K==43 THEN

RECT();

G:=SBR2(G);

SBR1(R,G,B);

END;

// Key 3, blue

IF K==44 THEN

RECT();

B:=SBR2(B);

SBR1(R,G,B);

END;

UNTIL K==4; // ESC key

END;

// sub routines

// all subroutines have

// all local variables

SBR1(x,y,z)

BEGIN

TEXTOUT_P("[ 1 ]: Red: "+x,

0,20,4,#FF0000h);

TEXTOUT_P("[ 2 ]: Green: "+y,

0,40,4,#00FF00h);

TEXTOUT_P("[ 3 ]: Blue: "+z,

0,60,4,#0000FFh);

TEXTOUT_P("[Esc]: Exit",

0,120,4);

// draw box

FILLPOLY_P({(160,20),(310,20),

(310,170),(160,170)},RGB(x,y,z));

END;

SBR2(t)

BEGIN

t:=t+64;

IF t==256 THEN t:=255; END;

IF t==319 THEN t:=0; END;

RETURN t;

END;

Eddie

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