52 lines
1.0 KiB
C
52 lines
1.0 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 "2d.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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for (i = 0; i < dxabs; i++) {
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y += dyabs;
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if (y >= dxabs) {
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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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} else { /* la ligne est plus verticale que horizontale */
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for (i = 0; i < dyabs; i++) {
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x += dxabs;
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if (x >= dyabs) {
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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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