mirror of
https://github.com/kichikuou/xsystem35-sdl2.git
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97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* screen_quake.c: スクリーン全体を揺らす
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*
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* Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
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* 1998- <masaki-c@is.aist-nara.ac.jp>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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. See the
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* GNU General Public License for more details.
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*
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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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*/
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/* $Id: screen_quake.c,v 1.1 2003/04/22 16:29:52 chikama Exp $ */
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "portab.h"
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#include "system.h"
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// #include "LittleEndian.h"
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#include "ags.h"
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#include "input.h"
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#include "sact.h"
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#include "sprite.h"
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#include "randMT.h"
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#define M_PIf ((float)M_PI)
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typedef void entrypoint (float step, int p1, int p2, int *retx, int *rety);
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// 上下左右方向の揺らし
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static void quake0(float step, int ampx, int ampy, int *adjx, int *adjy) {
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static int i = 0;
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*adjx = (int)(genrand() * ampx/2);
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*adjy = (int)(genrand() * ampy/2);
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*adjx *= ((-1)*(i%2) + ((i+1)%2));
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*adjy *= ((-1)*((i+1)%2) + (i%2));
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i++;
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}
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// 回転の揺らし
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static void quake1(float curstep, int diam, int round, int *adjx, int *adjy) {
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float R = (1 - curstep) * diam / 2;
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float th = curstep * 2 * M_PIf * round;
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*adjx = (int)(R * cosf(th));
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*adjy = (int)(R * sinf(th));
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}
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/*
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画面揺らし
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@param wType: 0=縦横, 1:回転
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@param wParam1: wType=0のときx方向の振幅
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wType=1のとき振幅
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@param wParam2: wType=0のときy方向の振幅
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wType=1のとき回転数
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@param wCount: 時間(1/100秒)
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@param nfKeyEnable: キー抜け (1で有効)
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*/
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void sp_quake_screen(int type, int p1, int p2, int time, int cancel) {
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int sttime, edtime, curtime;
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int key;
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entrypoint *cb[2] = {quake0, quake1};
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if (type > 1) return;
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sttime = sys_get_ticks();
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edtime = time * 10 + sttime;
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while ((curtime = sys_get_ticks()) < edtime) {
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int adjx, adjy;
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cb[type]((float)(curtime - sttime)/(edtime - sttime), p1, p2, &adjx, &adjy);
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ags_setViewArea(adjx, adjy, main_surface->w, main_surface->h);
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ags_updateFull();
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key = sys_keywait(10, cancel ? KEYWAIT_CANCELABLE : KEYWAIT_NONCANCELABLE);
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if (cancel && key) break;
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}
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ags_setViewArea(0, 0, main_surface->w, main_surface->h);
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ags_updateFull();
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}
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