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#include "main.h"
#include <stdio.h>
#define DrawArc(x,y,w,h) XFillArc(display, base, gc[BEADS],x,y,w,h,0,360*64)
/*----------------------------------------------------------------------
* initAbacus, initializes the bits in the column array to represent
* the resting positions of the beads: 2 bead on top deck pos 1 & 2,
* pos 2 empty; 5 beads lower deck pos 4-8, pos 3 empty
*
* ============= Row Position (index 'r' )
* O 0
* O 1 Upper Deck
* | 2
* =============
* | 3
* O 4
* O 5 Lower Deck
* O 6
* O 7
* O 8
* =============
* passed, returns: nothing
*/
initAbacus()
{
int i;
#ifdef DEBUG
(void)fprintf(stderr," DEBUG initAbacus():\n");
#endif
/* 502d=111110011 (2 bead on top deck pos 1 & 2; 5 beads lower deck
* pos 4-8, pos 2 & 3 are empty initially) */
for(i=0; i<MAXCOLS; i++) column[i]=499;
}/* init abacus */
/*----------------------------------------------------------------------
* drawAbacus, calls the necessary routines to draw the abacus;
* for handling exposures.
*
* passed, returns: nothing
*/
drawAbacus()
{
unsigned int i;
#ifdef DEBUG
(void)fprintf(stderr," DEBUG drawAbacus():\n");
#endif
/* since the beads are XOR'd it causes problems if the window isn't
* cleared*/
XClearWindow( display, base);
drawRails();
drawFrame();
drawMidFrame();
for(i=0; i<ncols; i++) drawColumn(i);
}/* draw*/
animateBead(r,c)
unsigned int r,c;
{
int i;
if(r<3){ /* selection in upper deck*/
/* find empty row in upperdeck; pos 0,1,2*/
for(i=0; i<3; i++) if(!RowOccupied(i,column[c])) break;
if(i<r) /* if empty row is above cur bead...*/
moveBeadUp(r,c);
else
moveBeadDn(r,c);
}
else{ /* selection in upper deck*/
/* find empty row in lowerdeck; pos 3-8 */
for(i=3; i<9; i++) if(!RowOccupied(i,column[c])) break;
if(i<r) /* if empty row is above cur bead...*/
moveBeadUp(r,c);
else
moveBeadDn(r,c);
}
}/* animate bead*/
moveBeadUp(r,c)
unsigned int r,c;
{
/* keep looking for an empty position directly above*/
if(RowOccupied(r-1,column[c])) moveBeadUp(r-1,c);
undrawBead(r,c);
column[c]=column[c]-(1<<r); /* row 'r' is now empty */
drawBead(r-1,c);
column[c]=column[c]+((unsigned)1<<((r-1))); /* row 'r-1' now is occupied*/
return;
}/* move bead up*/
moveBeadDn(r,c)
unsigned int r,c;
{
/* keep looking for an empty position directly below*/
if(RowOccupied(r+1,column[c])) moveBeadDn(r+1,c);
undrawBead(r,c);
column[c]=column[c]-(1<<r); /* row 'r' is now empty */
drawBead(r+1,c);
column[c]=column[c]+((unsigned)1<<((r+1))); /* row 'r+1' now is occupied*/
}/* move bead down*/
/*----------------------------------------------------------------------
* drawColumn, calls the routines necessary to re-draw 1 complete column
*
* passed: an index (0 - ncols) representing colimn to be drawn
* returns: nothing
*/
drawColumn(col)
unsigned int col;
{
unsigned int beadnum;
for(beadnum=0; beadnum<9; beadnum++)
if(RowOccupied(beadnum,column[col])) drawBead(beadnum, col);
}/* draw column*/
/*----------------------------------------------------------------------
* drawBead, draws 1 bead
*
* passed: an index representing the column number the bead is in
* an index representing the row of the bead is in
* rows numbered 0 to 9 (7 beads + 2 blanks)
*/
drawBead(beadnum,col)
unsigned int col,beadnum;
{
if(beadnum<3) /* drawing beads on top deck*/
DrawArc( framewidth+colgap+(col*(beadwidth+colgap)),
framewidth+(beadnum*(beadheight+rowgap)), beadwidth, beadheight);
else /* drawing beads on bot deck, account for middle frame*/
DrawArc( framewidth+colgap+(col*(beadwidth+colgap)),
(2*framewidth)+(beadnum*(beadheight+rowgap)),
beadwidth, beadheight);
XFlush(display);
}
/*----------------------------------------------------------------------
* undrawBead, undraws a bead at given location (The beads are drawn using
* the XOR function so this is possible.
*/
undrawBead(beadnum,col)
unsigned int col,beadnum;
{
drawBead(beadnum,col);
}
/*----------------------------------------------------------------------
* drawFrame, drawMidFrame, drawRails, draw the rest of the abacus
* it is advisable to call drawRails before the ~Frame routines
*/
drawMidFrame()
{
XDrawLine(display, base, gc[FRAME],0,midframey+(ROWGAP<<1),
width,midframey+(ROWGAP<<1));
XFlush(display);
}/* draw mid frame*/
drawFrame()
{
XDrawRectangle(display, base, gc[FRAME], framewidth/2,framewidth/2,
width-(framewidth),height-(framewidth));
XFlush(display);
}/* draw frame*/
drawRails()
{
int i;
for(i=0; i<ncols; i++)
XDrawLine(display, base, gc[RAILS],
framewidth+colgap+(beadwidth/2)+(i*(beadwidth+colgap)),0,
framewidth+colgap+(beadwidth/2)+(i*(beadwidth+colgap)),height);
XFlush(display);
}/* draw Rails*/
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