本设计根据tslib中提供的ts_test程序修改而来,本设计中ts_test.c还依赖于tslib中的其他文件,若想直接编译,可置于tslib中的test文件夹中,替换到原来的文件。本设计根据tslib中提供的API取得X,Y坐标,根据得到的X,Y,打开fb0,映射进入内存(出于速度的考虑),进行划线,对线条进行了加粗处理,并随机生成颜色,最终形成灿烂的笔画。
ts_test.c
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include<linux/fb.h>
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#include "tslib.h"
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#include "fbutils.h"
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unsigned char *fbp;
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struct fb_var_screeninfo vinfo;
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struct fb_fix_screeninfo finfo;
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void drawpoint(unsigned int x,unsigned int y,unsigned int *color)
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{
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unsigned char *fbp0;
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fbp0=fbp;
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fbp0+=y*vinfo.xres*vinfo.bits_per_pixel/8+x*vinfo.bits_per_pixel/8;
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memcpy(fbp0,color,vinfo.bits_per_pixel/8);
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}
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void drawline(unsigned int x0,unsigned int y0,unsigned int x1,unsigned int y1,unsigned int *color)
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{
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unsigned int x=x0;
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unsigned int y=y0;
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int s0,s1,s2;
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while(x!=x1||y!=y1)
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{
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drawpoint(x,y,color);//以下为加粗直线
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drawpoint(x+1,y,color);
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drawpoint(x,y+1,color);
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drawpoint(x+1,y+1,color);
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drawpoint(x+2,y,color);
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drawpoint(x,y+2,color);
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drawpoint(x+2,y+2,color);
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if(x0>=x1&&y0>=y1) //求直线下一点的算法。
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{
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s0=abs((x-x0-1)*(y0-y1)-(y-y0)*(x0-x1));
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s1=abs((x-x0)*(y0-y1)-(y-y0-1)*(x0-x1));
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s2=abs((x-x0-1)*(y0-y1)-(y-y0-1)*(x0-x1));
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s0<=s1?(s0<=s2?x=x-1:(x=x-1,y=y-1)):(s1<=s2?y=y-1:(x=x-1,y=y-1));
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}
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else if(x0>=x1&&y0<=y1)
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{
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s0=abs((x-x0-1)*(y0-y1)-(y-y0)*(x0-x1));
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s1=abs((x-x0)*(y0-y1)-(y-y0+1)*(x0-x1));
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s2=abs((x-x0-1)*(y0-y1)-(y-y0+1)*(x0-x1));
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s0<=s1?(s0<=s2?x=x-1:(x=x-1,y=y+1)):(s1<=s2?y=y+1:(x=x-1,y=y+1));
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}
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else if(x0<=x1&&y0>=y1)
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{
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s0=abs((x-x0+1)*(y0-y1)-(y-y0)*(x0-x1));
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s1=abs((x-x0)*(y0-y1)-(y-y0-1)*(x0-x1));
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s2=abs((x-x0+1)*(y0-y1)-(y-y0-1)*(x0-x1));
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s0<=s1?(s0<=s2?x=x+1:(x=x+1,y=y-1)):(s1<=s2?y=y-1:(x=x+1,y=y-1));
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}
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else if(x0<=x1&&y0<=y1)
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{
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s0=abs((x-x0+1)*(y0-y1)-(y-y0)*(x0-x1));
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s1=abs((x-x0)*(y0-y1)-(y-y0+1)*(x0-x1));
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s2=abs((x-x0+1)*(y0-y1)-(y-y0+1)*(x0-x1));
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s0<=s1?(s0<=s2?x=x+1:(x=x+1,y=y+1)):(s1<=s2?y=y+1:(x=x+1,y=y+1));
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}
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}
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drawpoint(x,y,color);
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}
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int mrand(int x,int y) //生成x到y之间的随机数。
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{
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int i;
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struct timeval tpstart;
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gettimeofday(&tpstart,NULL);
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srand(tpstart.tv_usec); //微秒级产生随机数种子
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return (rand()%(y-x+1)+x);
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}
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static int palette [] =
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{
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0x000000, 0xffe080, 0xffffff, 0xe0c0a0, 0x304050, 0x80b8c0
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};
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#define NR_COLORS (sizeof (palette) / sizeof (palette [0]))
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struct ts_button {
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int x, y, w, h;
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char *text;
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int flags;
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#define BUTTON_ACTIVE 0x00000001
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};
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/* [inactive] border fill text [active] border fill text */
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static int button_palette [6] =
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{
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1, 4, 2,
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1, 5, 0
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};
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#define NR_BUTTONS 2
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static struct ts_button buttons [NR_BUTTONS];
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static void sig(int sig)
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{
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close_framebuffer();
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fflush(stderr);
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printf("signal %d caught\n", sig);
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fflush(stdout);
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exit(1);
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}
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static void button_draw (struct ts_button *button)
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{
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int s = (button->flags & BUTTON_ACTIVE) ? 3 : 0;
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rect (button->x, button->y, button->x + button->w - 1,
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button->y + button->h - 1, button_palette [s]);
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fillrect (button->x + 1, button->y + 1,
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button->x + button->w - 2,
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button->y + button->h - 2, button_palette [s + 1]);
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put_string_center (button->x + button->w / 2,
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button->y + button->h / 2,
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button->text, button_palette [s + 2]);
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}
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static int button_handle (struct ts_button *button, struct ts_sample *samp)
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{
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int inside = (samp->x >= button->x) && (samp->y >= button->y) &&
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(samp->x < button->x + button->w) &&
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(samp->y < button->y + button->h);
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if (samp->pressure > 0) {
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if (inside) {
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if (!(button->flags & BUTTON_ACTIVE)) {
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button->flags |= BUTTON_ACTIVE;
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button_draw (button);
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}
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} else if (button->flags & BUTTON_ACTIVE) {
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button->flags &= ~BUTTON_ACTIVE;
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button_draw (button);
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}
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} else if (button->flags & BUTTON_ACTIVE) {
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button->flags &= ~BUTTON_ACTIVE;
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button_draw (button);
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return 1;
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}
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return 0;
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}
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static void refresh_screen ()
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{
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int i;
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fillrect (0, 0, xres - 1, yres - 1, 0);
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put_string_center (xres/2, yres/4, "Enjoy the writing! ", 1);
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put_string_center (xres/2, yres/4+20,"Touch screen to move crosshair", 2);
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for (i = 0; i < NR_BUTTONS; i++)
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button_draw (&buttons [i]);
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}
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int main()
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{
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int fd;
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long int screensize;
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int color=0x00ff0000;//榛樿?red
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if((fd=open("/dev/fb0",O_RDWR))<0)
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{
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perror("fail to open");
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return 0;
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}
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if (ioctl(fd,FBIOGET_FSCREENINFO, &finfo))
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{
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perror("fail to get");
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return 0;
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}
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if (ioctl(fd,FBIOGET_VSCREENINFO, &vinfo))
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{
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perror("fail to get");
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return 0;
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}
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screensize=vinfo.xres*vinfo.yres*vinfo.bits_per_pixel/8;
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fbp=(unsigned char *)mmap(0,screensize,PROT_READ | PROT_WRITE,MAP_SHARED,fd, 0);
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struct tsdev *ts;
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int x, y;
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unsigned int i;
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unsigned int mode = 0;
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char *tsdevice=NULL;
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signal(SIGSEGV, sig);
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signal(SIGINT, sig);
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signal(SIGTERM, sig);
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if ((tsdevice = getenv("TSLIB_TSDEVICE")) == NULL) {
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#ifdef USE_INPUT_API
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tsdevice = strdup ("/dev/input/event0");
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#else
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tsdevice = strdup ("/dev/touchscreen/ucb1x00");
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#endif /* USE_INPUT_API */
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}
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ts = ts_open (tsdevice, 0);
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if (!ts) {
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perror (tsdevice);
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exit(1);
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}
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if (ts_config(ts)) {
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perror("ts_config");
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exit(1);
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}
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if (open_framebuffer()) {
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close_framebuffer();
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exit(1);
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}
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x = xres/2;
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y = yres/2;
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for (i = 0; i < NR_COLORS; i++)
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setcolor (i, palette [i]);
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/* Initialize buttons */
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memset (&buttons, 0, sizeof (buttons));
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buttons [0].w = buttons [1].w = xres / 4;
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buttons [0].h = buttons [1].h = 20;
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buttons [0].x = xres / 4 - buttons [0].w / 2;
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buttons [1].x = (3 * xres) / 4 - buttons [0].w / 2;
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buttons [0].y = buttons [1].y = 10;
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buttons [0].text = "Drag";
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buttons [1].text = "Draw";
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refresh_screen ();
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while (1) {
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struct ts_sample samp;
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int ret;
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/* Show the cross */
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if ((mode & 15) != 1)
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put_cross(x, y, 2 | XORMODE);
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ret = ts_read(ts, &samp, 1); //璇诲叆
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/* Hide it */
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if ((mode & 15) != 1)
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put_cross(x, y, 2 | XORMODE);
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if (ret < 0) {
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perror("ts_read");
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close_framebuffer();
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exit(1);
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}
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if (ret != 1)
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{
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continue;
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}
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for (i = 0; i < NR_BUTTONS; i++)
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if (button_handle (&buttons [i], &samp))
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switch (i) {
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case 0:
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mode = 0;
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refresh_screen ();
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break;
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case 1:
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mode = 1;
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refresh_screen ();
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break;
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}
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printf("%ld.%06ld: %6d %6d %6d\n", samp.tv.tv_sec, samp.tv.tv_usec,
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samp.x, samp.y, samp.pressure);
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if (samp.pressure > 0)
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{
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if (mode == 0x80000001)
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{
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color=mrand(0x00000000,0x00ffffff);//随机生成颜色,可能因屏幕不同而范围不同。
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drawline(x,y,samp.x,samp.y,&color);
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}
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x = samp.x;
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y = samp.y;
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mode |= 0x80000000;
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}
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else
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{
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mode &= ~0x80000000;
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}
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}
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close_framebuffer();
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}
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