74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
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Copyright (C) 2015-2019 Parallel Realities
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "starfield.h"
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static Star stars[MAX_STARS];
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void initStars(void)
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{
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int i;
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memset(stars, 0, sizeof(Star) * MAX_STARS);
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for (i = 0 ; i < MAX_STARS ; i++)
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{
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stars[i].x = rand() % app.winWidth;
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stars[i].y = rand() % app.winHeight;
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stars[i].speed = 5 + rand() % 35;
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stars[i].speed *= 0.1;
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}
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}
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void doStars(float dx, float dy)
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{
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int i;
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for (i = 0 ; i < MAX_STARS ; i++)
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{
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stars[i].x -= (dx * stars[i].speed);
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stars[i].y -= (dy * stars[i].speed);
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stars[i].x = mod(stars[i].x, app.winWidth - 1);
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stars[i].y = mod(stars[i].y, app.winHeight - 1);
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}
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}
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void drawStars(void)
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{
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int i;
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int c;
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for (i = 0 ; i < MAX_STARS ; i++)
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{
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c = 64 * stars[i].speed;
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SDL_SetRenderDrawColor(app.renderer, c, c, c, 255);
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SDL_RenderDrawPoint(app.renderer, stars[i].x, stars[i].y);
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if (c >= 240)
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{
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SDL_RenderDrawPoint(app.renderer, stars[i].x + 1, stars[i].y + 1);
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}
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}
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}
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