[TOC]
滑动事件
lcd.c
#include"lcd.h"
/*
Init_LCD:初始化显示屏
参数为空
返回值 int*
成功 返回映射区域的首地址
失败 返回NULL
*/
int *Init_LCD(int *fd)
{
//1.打开帧缓冲
*fd = open("/dev/fb0",O_RDWR);
if(-1 == *fd)
{
perror("open fail");
return NULL;
}
//2.映射
int *plcd = mmap(NULL,800*480*4
,PROT_READ | PROT_WRITE,
MAP_SHARED,*fd,0);
if(MAP_FAILED == plcd)
{
perror("mmap fail");
return NULL;
}
return plcd;
}
/*
Uninit_LCD:解初始化屏幕
@fd:帧缓冲的文件描述符
@plcd:
返回值:无
*/
void Uninit_LCD(int fd,int *plcd)
{
//1.解映射
munmap(plcd,800*480*4);
//2.关闭帧缓冲
close(fd);
}
void Lcd_draw_point(int x,int y,int color,int *plcd)
{
if(NULL == plcd)
{
printf("error:plcd == NULL\n");
return ;
}
if(x>=0&&x<800&&y>=0&&y<480)
{
*(plcd+800*y+x) = color;
}
}
/*
Bmp_display:在屏幕的指定的位置显示bmp图片
@bmp_file：图片的路径名
@x0 y0 图片左上角在屏幕上的坐标
@plcd:帧缓冲映射区域的首地址
返回值：
-1 失败
0 成功
*/
int Bmp_display(const char *bmp_file,int x0,int y0,int *plcd)
{
if(plcd == NULL || !(x0>=0&&x0<800&&y0>=0&&y0<480))
{
return -1;
}
//1.打开图片
int fd = open(bmp_file,O_RDONLY);
if(-1 == fd)
{
printf("%s",bmp_file);
perror("open fail");
return -1;
}
//2.判断到底是不是一张bmp图片
char buf[4]={0};
read(fd,buf,2);
if(buf[0]!=0x42 || buf[1]!=0x4D)
{
printf("NOT BMP\n");
close(fd);
return -1;
}
//3.解析图片 宽 高 色深
lseek(fd,0x12,SEEK_SET);
read(fd,buf,4);
int width = buf[3]<<24 | buf[2]<<16 | buf[1]<<8 | buf[0];
lseek(fd,0x16,SEEK_SET);
read(fd,buf,4);
int height = buf[3]<<24 | buf[2]<<16 | buf[1]<<8 | buf[0];
lseek(fd,0x1c,SEEK_SET);
read(fd,buf,2);
short depth = buf[1]<<8 | buf[0];
if(!(depth == 24 || depth == 32))
{
printf("NOT SUPPORT!\n");
close(fd);
return -1;
}
printf("%s:%d*%d depth:%d\n",bmp_file,width,height,depth);
//4.获取像素数组
int line_vaild_bytes=abs(width)*depth/8;
int line_bytes;//一行总字节数=有效字节数+赖子数
int laizi = 0;
if(line_vaild_bytes%4)
{
laizi = 4 - line_vaild_bytes%4;
}
line_bytes = line_vaild_bytes + laizi;
int total_bytes = line_bytes*abs(height);//整个像素数组的大小
//从文件中读取像素数组
lseek(fd,54,SEEK_SET);
unsigned char piexl[total_bytes];
read(fd,piexl,total_bytes);
//5.在屏幕的对应位置显示即可
unsigned char a,r,g,b;
int color;
int i=0;
int x,y;
//遍历整个像素数组
for(y=0;y<abs(height);y++)
{
for(x=0;x<abs(width);x++)
{
b=piexl[i++];
g=piexl[i++];
r=piexl[i++];
if(depth==32)
{
a=piexl[i++];
}
else
{
a=0;//不透明
}
color=a<<24|r<<16|g<<8|b;
Lcd_draw_point(width>0?x+x0:x0+abs(width)-x-1,
height>0?y0+abs(height)-y-1:y0+y,color,plcd);
}
//每一行末尾可能存在赖子
i+=laizi;
}
close(fd);
return 0;
}
lcd.h
#ifndef __LCD_H__
#define __LCD_H__
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/mman.h>
#include <stdlib.h>
/*宏定义*/
#define FILE_PATH "/dev/fb0"
/*函数声明*/
int *Init_LCD(int *fd);
void Uninit_LCD(int fd,int *plcd);
void Lcd_draw_point(int x,int y,int color,int *plcd);
int Bmp_display(const char *bmp_file,int x0,int y0,int *plcd);
#endif
touch.h
#ifndef __TOUCH_H__
#define __TOUCH_H__
#include<stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <linux/input.h>//输入子系统
#define UP 1
#define DOWN 2
#define LEFT 3
#define RIGHT 4
/*按一下屏幕，终端打印屏幕坐标*/
void getTouch(int* x,int* y);
int getTouchWay();
#endif
touch.c
int getTouchWay()
{
int x_start = -1;
int y_start = -1;
int x_end = -1;
int y_end = -1;
//1.打开触摸屏
int fd = open("/dev/input/event0",O_RDONLY);
if(-1 == fd)
{
perror("open ScreenTouch failed\n");
return -1;
}
//2.操作
struct input_event ev;
while(1)
{
int ev_long=read(fd,&ev,sizeof(ev));
if(ev_long != sizeof(ev))
{
continue;
}
//
// if(ev.type == EV_KEY && ev.code == BTN_TOUCH && ev.value == 0)
// {
// break;
// }
if(ev.type == EV_ABS)
{
// if(ev.code == ABS_PRESSURE && ev.value == 0)
// {
// break;
// }
if(ev.code == ABS_X)
{
if(x_start == -1)
{
x_start = ev.value;
}
x_end = ev.value;
}
if(ev.code == ABS_Y)
{
if(y_start == -1)
{
y_start = ev.value;
}
y_end = ev.value;
}
}
if(abs(x_end - x_start) > abs(y_end - y_start))
{
if(x_end - x_start > 0)
{
printf("RIGHT\n");
return RIGHT;
}
else
{
printf("LEFT\n");
return LEFT;
}
}
if(abs(x_end - x_start) < abs(y_end - y_start))
{
if(y_end - y_start > 0)
{
printf("DOWN\n");
return DOWN;
}
else
{
printf("UP\n");
return UP;
}
}
}
}
main.c
#include"touch.h"
#include"lcd.h"
int main(int argc,char **argv)
{
int fd=-1;
int* plcd = Init_LCD(&fd);
int x=-1,y=-1;
long int i=0;
int flag=0;
char* str[]={"1.bmp","2.bmp","3.bmp","4.bmp","5.bmp","6.bmp","7.bmp","8.bmp","9.bmp","10.bmp"};
//初始化屏幕
for(y=0;y<480;y++)
{
for(x=0;x<800;x++)
{
Lcd_draw_point(x,y,0x58962564,plcd);
}
}
Bmp_display("start.bmp",300,180,plcd);
while(1)
{
getTouch(&x,&y);
printf("( %d , %d )\n",x,y);
if(300<x&&500>x&&180<y&&300>y)
{
flag=1;
break;
}
}
while(flag)
{
int act= getTouchWay();
Bmp_display(str[i],0,0,plcd);
if(3==act)
{
i--;
if(i<0)
{
i=9;
}
}
if(4==act)
{
i++;
if(10==i)
{
i=0;
}
}
if(1==act)
{
break;
}
}
Uninit_LCD(fd,plcd);
//getTouch();
}