106 lines
3.9 KiB
C++
106 lines
3.9 KiB
C++
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/* Function prototypes, macros, structure, and global variables for
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* Turtle Graphics functions.
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*/
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/* Include only once */
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#ifndef TURTLE_H
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#define TURTLE_H
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/* Initiate and set defaults */
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short InitTurtle( struct videoconfig *vc );
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short Home( void );
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/* Control pen and color */
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int PenDown( int state );
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short SetFill( short state );
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short PenColor( short atrib );
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short BorderColor( short border );
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/* Control angle */
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short Turn( short angle );
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short TurnTo( short angle );
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/* Turtle movement */
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short Move( double distance );
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short MoveTo( double x, double y );
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short Poly( int number, double side );
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/* Rotate color index or value */
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short NextColorIndex( short ciCur );
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void NextColorValue( int fAction );
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/* Put a circle with radius <r> at current location. */
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#define Circle( r ) _ellipse_w( tc.fFill, tc.xCur-(r), tc.yCur-(r), \
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tc.xCur+(r), tc.yCur+(r) )
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/* Puts an ellipse with width <w> and height <h> at current location. */
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#define Ellipse( w, h ) _ellipse_w( tc.fFill, \
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tc.xCur-((w)/2), tc.yCur-((h)/2), \
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tc.xCur+((w)/2), tc.yCur+((h)/2) )
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/* Puts the center of a rectangle with width <w> and height <h>
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* at current location.
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*/
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#define Rectangle( w, h ) _rectangle_w( tc.fFill, \
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tc.xCur-((w)/2), tc.yCur-((h)/2), \
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tc.xCur+((w)/2), tc.yCur+((h)/2) )
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/* Gets the imagesize of an image with width <w> and height <h>
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* with left-top at current location. Returns image size.
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*/
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#define ImageSize( w, h ) _imagesize_w( tc.xCur, tc.yCur, \
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tc.xCur+(w), tc.yCur+(h) )
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/* Gets an image with width <w> and height <h> with left-top
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* at current location. Returns image buffer.
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*/
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#define GetImage( w,h,buf) _getimage_w( tc.xCur, tc.yCur, \
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tc.xCur+(w), tc.yCur+(h), buf )
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/* Puts the top-left corner of a specified image at current location
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* using a specified action (_GPSET, _GPRESET, _GAND, _GOR, _GXOR).
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*/
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#define PutImage( buf, act ) _putimage_w( tc.xCur, tc.yCur, buf, act )
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/* Fills starting at the current location and continues to border. */
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#define FillIn() _floodfill_w( tc.xCur, tc.yCur, tc.ciBorder )
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/* Returns nonzero if the current location is onscreen. */
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#define OnScreen() (!((tc.xCur < -tc.xMax) || (tc.xCur > tc.xMax) || \
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(tc.yCur < -tc.yMax) || (tc.yCur > tc.yMax)))
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/* Returns a long int mixed from red, green, and blue bytes. */
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#define RGB( r,g,b) (((long)((b) << 8 | (g)) << 8) | (r))
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/* Constants */
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#define CIRCUMFERENCE 360
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#define HALFCIRCUMFERENCE 180
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#define DEFAULT -1
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#define LIMITED 0
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#define TRUE 1
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#define FALSE 0
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#define WHITE (tc.cci - 1)
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/* Structures for configuration and other data */
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typedef struct _TURTLE
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{
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double yxRatio; /* Y to X aspect ratio */
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double xMax, yMax; /* Maximum x and y */
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double yUnit; /* Window size of one pixel */
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double xCur, yCur; /* Current position */
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short cci; /* Count of color indexes */
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short ccv; /* Count of color values */
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short ciCur; /* Current color index */
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short ciBorder; /* Current border color index */
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short angCur; /* Current angle */
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int fPenDown; /* Pen state */
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int fFill; /* Fill state */
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int fPalette; /* Palette availability */
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short xsLeft, xsRight; /* Absolute window corners */
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short ysTop, ysBot;
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} TURTLE;
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extern TURTLE tc;
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#endif /* TURTLE_H */
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