X Window Graphics

Module Graphics provides a convenient interface in Parallaxis for generating graphics, based on the X window system. Like read/write operations, graphics operations do not generate runtime errors, but set the variable Done according to the success of an operation. Type CARDINAL restricts INTEGER to positive numbers (>= 0). 
TYPE binary = BOOLEAN; 
     gray   = [0..255]; 
     color  = RECORD 
                red, green, blue: gray 
              END;
PROCEDURE OpenWindow(title: ARRAY OF CHAR;
width,height: CARDINAL): CARDINAL;
Open a new window with specified title bar and size in pixels, return window number, activate new window

PROCEDURE GetScreenSize(VAR width,height: CARDINAL);
Returns size in pixels of whole screen

PROCEDURE GetWindowSize(VAR width,height: CARDINAL);
Returns size in pixels of active window

PROCEDURE SelectWindow(window_num: CARDINAL);
Activate a window

PROCEDURE CloseWindow(window_num: CARDINAL);
Close a window

PROCEDURE SetPixel(c: VECTOR OF color);
All active PEs write one pixel each, assuming a 2-dim. grid configuration of appropriate size, image will be truncated or left partly unchanged if PE grid size does not match image size

PROCEDURE Set1Pixel(x,y: CARDINAL; c: color);
Set a single pixel

PROCEDURE Get1Pixel(x,y: CARDINAL; c: color);
Get a single pixel

PROCEDURE Line(x1,y1, x2,y2: CARDINAL);
Draw a line from y1,x1 to y2,x2

PROCEDURE DrawAt(x,y: CARDINAL);
Set position for subsequent drawing commands (lower left character position, initial: 0,0), position will be update by each drawing command

PROCEDURE Draw(c: CHAR);
Draw character c in window

PROCEDURE DrawString(s: ARRAY OF CHAR);
Draw string s in window

PROCEDURE DrawInt(i,l: INTEGER);
Draw integer i in window, using l print spaces

PROCEDURE DrawReal(r: REAL; l: CARDINAL);
Draw real r in window, using l print spaces

PROCEDURE DrawFixPt(r: REAL; l,m: CARDINAL);
Draw integer i in window, using l print spaces and m decimals

PROCEDURE DrawBool(b: BOOLEAN);
Draw boolean value b in window

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