59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
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#include "types.h"
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#include "vga.h"
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#include "video.h"
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#include "graph.h"
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#include "math.h"
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/******************************************************************************/
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/* Affiche une ligne entre les points sp<73>cifi<66>s */
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void line(u32 x1, u32 y1, u32 x2, u32 y2, u8 color)
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{
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s32 dx,dy,sdx,sdy;
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u32 i,dxabs,dyabs,x,y,px,py;
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dx=x2-x1; /* distance horizontale de la line */
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dy=y2-y1; /* distance verticale de la line **/
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dxabs=abs(dx);
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dyabs=abs(dy);
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sdx=sgn(dx);
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sdy=sgn(dy);
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x=dyabs>>1;
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y=dxabs>>1;
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px=x1;
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py=y1;
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writepxl(px,py,color);
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if (dxabs>=dyabs) /* la ligne est plus horizontale que verticale */
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{
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for(i=0;i<dxabs;i++)
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{
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y+=dyabs;
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if (y>=dxabs)
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{
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y-=dxabs;
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py+=sdy;
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}
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px+=sdx;
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writepxl(px,py,color);
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}
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}
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else /* la ligne est plus verticale que horizontale */
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{
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for(i=0;i<dyabs;i++)
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{
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x+=dxabs;
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if (x>=dyabs)
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{
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x-=dyabs;
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px+=sdx;
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}
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py+=sdy;
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writepxl(px,py,color);
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}
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}
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}
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