mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
synced 2026-09-28 17:58:09 +03:00
103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
// アフィン変換 (回転)
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static void do_aff(surface_t *in, surface_t *out, int deg, double zx, double zy) {
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int xs = in->width / 2;
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int ys = in->height / 2;
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double r = deg * M_PI / 180;
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double c = cos(r);
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double s = sin(r);
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double x, y;
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int i, j, m, n;
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switch(in->depth) {
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case 16: {
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WORD *src, *dst;
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for (i = -ys; i < ys; i++) {
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for (j = -xs; j < xs; j++) {
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y = (j * s + i * c) / zy;
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x = (j * c - i * s) / zx;
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if (y > 0) m = (int)y;
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else m = (int)(y -1);
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if (x > 0) n = (int)x;
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else n = (int)(x -1);
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src = (WORD *)GETOFFSET_PIXEL(in, n+xs, m+ys);
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dst = (WORD *)GETOFFSET_PIXEL(out, j+xs, i+ys);
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if ((m >= -ys) && (m < ys) && (n >= -xs) && (n < xs)) {
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*dst = *src;
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}
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}
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}
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break;
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}
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case 24:
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case 32: {
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DWORD *src, *dst;
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for (i = -ys; i < ys; i++) {
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for (j = -xs; j < xs; j++) {
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y = (j * s + i * c) / zy;
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x = (j * c - i * s) / zx;
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if (y > 0) m = (int)y;
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else m = (int)(y -1);
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if (x > 0) n = (int)x;
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else n = (int)(x -1);
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src = (DWORD *)GETOFFSET_PIXEL(in, n+xs, m+ys);
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dst = (DWORD *)GETOFFSET_PIXEL(out, j+xs, i+ys);
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if ((m >= -ys) && (m < ys) && (n >= -xs) && (n < xs)) {
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*dst = *src;
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}
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}
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}
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break;
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}}
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}
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//回転アウト
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static void ec20_cb(surface_t *sfsrc, surface_t *sfdst) {
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//１回転だけ
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int maxstep, curstep;
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maxstep = 360;
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curstep = maxstep * (ecp.curtime - ecp.sttime)/ (ecp.edtime - ecp.sttime);
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sf_copyall(sf0, sfdst);
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do_aff(sfsrc, sf0, curstep, 1- (double)curstep / maxstep, 1- (double)curstep / maxstep);
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ags_updateFull();
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ecp.oldstep = curstep;
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}
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//回転イン
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static void ec21_cb(surface_t *sfsrc, surface_t *sfdst) {
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int maxstep, curstep;
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maxstep = 360;
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curstep = maxstep * (ecp.curtime - ecp.sttime)/ (ecp.edtime - ecp.sttime);
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sf_copyall(sf0, sfsrc);
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do_aff(sfdst, sf0, curstep, (double)curstep / maxstep, (double)curstep / maxstep);
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ags_updateFull();
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ecp.oldstep = curstep;
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}
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//回転アウト(時計回り)
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static void ec22_cb(surface_t *sfsrc, surface_t *sfdst) {
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int maxstep, curstep;
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maxstep = 360;
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curstep = maxstep * (ecp.curtime - ecp.sttime)/ (ecp.edtime - ecp.sttime);
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sf_copyall(sf0, sfdst);
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do_aff(sfsrc, sf0, -curstep, 1- (double)curstep / maxstep, 1- (double)curstep / maxstep);
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ags_updateFull();
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ecp.oldstep = curstep;
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}
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//回転イン(時計回り)
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static void ec23_cb(surface_t *sfsrc, surface_t *sfdst) {
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int maxstep, curstep;
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maxstep = 360;
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curstep = maxstep * (ecp.curtime - ecp.sttime)/ (ecp.edtime - ecp.sttime);
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sf_copyall(sf0, sfsrc);
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do_aff(sfdst, sf0, -curstep, (double)curstep / maxstep, (double)curstep / maxstep);
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ags_updateFull();
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ecp.oldstep = curstep;
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}
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