53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
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/******************************************************************************
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Plush Version 1.2
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cam.c
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Camera Control
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Copyright (c) 1996-2000, Justin Frankel
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******************************************************************************/
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#include "plush.h"
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void plCamDelete(pl_Cam *c) {
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if (c) free(c);
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}
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void plCamSetTarget(pl_Cam *c, pl_Float x, pl_Float y, pl_Float z) {
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double dx, dy, dz;
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dx = x - c->X;
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dy = y - c->Y;
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dz = z - c->Z;
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c->Roll = 0;
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if (dz > 0.0001f) {
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c->Pan = (pl_Float) (-atan(dx/dz)*(180.0/PL_PI));
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dz /= cos(c->Pan*(PL_PI/180.0));
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c->Pitch = (pl_Float) (atan(dy/dz)*(180.0/PL_PI));
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} else if (dz < -0.0001f) {
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c->Pan = (pl_Float) (180.0-atan(dx/dz)*(180.0/PL_PI));
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dz /= cos((c->Pan-180.0f)*(PL_PI/180.0));
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c->Pitch = (pl_Float) (-atan(dy/dz)*(180.0/PL_PI));
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} else {
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c->Pan = 0.0f;
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c->Pitch = -90.0f;
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}
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}
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pl_Cam *plCamCreate(pl_uInt sw, pl_uInt sh, pl_Float ar, pl_Float fov,
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pl_uChar *fb, pl_ZBuffer *zb) {
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pl_Cam *c;
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c = malloc(sizeof(pl_Cam));
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if (!c) return 0;
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memset(c,0,sizeof(pl_Cam));
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c->Fov = fov;
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c->AspectRatio = ar;
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c->ClipRight = c->ScreenWidth = sw;
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c->ClipBottom = c->ScreenHeight = sh;
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c->CenterX = sw>>1;
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c->CenterY = sh>>1;
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c->ClipBack = 8.0e30f;
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c->frameBuffer = fb;
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c->zBuffer = zb;
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c->Sort = 1;
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if (zb) c->Sort = 0;
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return (c);
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}
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