mirror of
https://github.com/eddyem/stm32samples.git
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109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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* This file is part of the TETRIS project.
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* Copyright 2021 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "adcrandom.h"
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#include "balls.h"
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#include "screen.h"
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#include "proto.h"
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#include "usb.h"
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extern uint32_t volatile Tms;
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// fraction of 1 for fixed point
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#define FIXPOINT (10000)
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// max pause in ms to add next ball
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#define MAXPAUSEADDBALL (5000)
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// max speed in fractions per millisecond
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#define SPEEDMAX (300)
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// max balls amount
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#define NBALLSMAX (20)
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// coordinates/speeds in fractions
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static int
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x[NBALLSMAX], y[NBALLSMAX],
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xnew[NBALLSMAX], ynew[NBALLSMAX],
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xspeed[NBALLSMAX], yspeed[NBALLSMAX];
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static uint8_t colr[NBALLSMAX];
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static int Nballs = 0;
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static uint32_t TlastB, Taddb;
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static void clear_balls(){
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for(int i = 0; i < Nballs; ++i)
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DrawPix(x[i]/FIXPOINT, y[i]/FIXPOINT, 0);
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}
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static void draw_balls(){
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for(int i = 0; i < Nballs; ++i){
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x[i] = xnew[i]; y[i] = ynew[i];
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DrawPix(x[i]/FIXPOINT, y[i]/FIXPOINT, colr[i]);
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}
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}
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static void add_ball(){
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if(Nballs == NBALLSMAX) return;
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uint8_t c = getRand() & 0xff;
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if(c == 0) c = 1;
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colr[Nballs] = c;
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x[Nballs] = SCREEN_WIDTH*FIXPOINT/2;
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y[Nballs] = SCREEN_HEIGHT*FIXPOINT/2;
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xspeed[Nballs] = ((int)getRand()) % SPEEDMAX;
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yspeed[Nballs] = ((int)getRand()) % SPEEDMAX;
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++Nballs;
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Taddb = Tms + getRand() % MAXPAUSEADDBALL;
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}
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void balls_init(){
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Nballs = 0;
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setBGcolor(COLOR_BLACK);
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ClearScreen();
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ScreenON();
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TlastB = Tms;
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add_ball();
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}
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//#define abs(x) ((x<0) ? -x : x)
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void process_balls(){
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if(Tms == TlastB) return;
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if(Nballs < NBALLSMAX && Taddb < Tms){
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add_ball();
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}
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int diff = (int)(Tms - TlastB);
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for(int i = 0; i < Nballs; ++i){
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xnew[i] = x[i] + xspeed[i]*diff;
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ynew[i] = y[i] + yspeed[i]*diff;
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inline void xrev(){xspeed[i] = -xspeed[i]; xnew[i] = x[i] + xspeed[i]*diff;}
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inline void yrev(){yspeed[i] = -yspeed[i]; ynew[i] = y[i] + yspeed[i]*diff;}
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if(xnew[i] < 0) xrev();
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else if(xnew[i] > SCREEN_WIDTH*FIXPOINT) xrev();
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if(ynew[i] < 0) yrev();
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else if(ynew[i] > SCREEN_HEIGHT*FIXPOINT) yrev();
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int nx = xnew[i]/FIXPOINT, ny = ynew[i]/FIXPOINT;
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int dx = nx - x[i]/FIXPOINT, dy = ny - y[i]/FIXPOINT;
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if((dx || dy) && GetPix(nx, ny)){ // change direction in case of collisions
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xrev(); yrev();
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xspeed[i] += getRand() & 3; // and randomly change speed
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yspeed[i] += getRand() & 3;
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}
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}
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clear_balls();
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draw_balls();
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TlastB = Tms;
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}
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