/
joy.c
executable file
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joy.c
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/*joystick上有一个ANALOG按键
ANALOG没有按下时，左边摇杆的功能和左边4个按键的功能相同，右边摇杆的功能和右边4个的按键功能相同。右边4按键的编号是1，2，3，4，侧边4个按键的编号是5，6，7，8,左边摇杆按下时编号是10，右边摇杆按下是编号是11。分别对应按键的结构体event.jbutton.button中的0到7，在这个结构体SELECT按键的编号是8，START按键的编号是9.
ANALOG按下时，左边摇杆还是原来的功能，x轴，y轴编号是0，1。而右边摇杆与左边摇杆功能一样，x轴，y轴的编号是2，3。右边按键和侧边按键的编号以及SELECT，START编号不变。
*/
#include <stdio.h>
#include <SDL/SDL.h>
//是否开启ANALOG 模式,如果没启动，编译的就可以去掉那部分代码，虽然一起编译也不会右影响
#define ANALOG 1
//初始化
void init_joystick();
//按键按下
void joy_button_down();
//按键松开
void joy_button_up();
//摇杆控制
void joy_axis_motion();
void joy_hat_motion();
void close_joystick();
//ball功能没有检测到
void joy_ball_motion();
//事件结构体
SDL_Event event;
//接收控制杆信息的指针
SDL_Joystick *stick = NULL;
int main(int argc ,char *argv[])
{
SDL_Init(SDL_INIT_EVERYTHING);
init_joystick();
while(1)
{
if(SDL_PollEvent( &event))
{
joy_axis_motion();
joy_button_down();
joy_button_up();
#if ANALOG
joy_hat_motion();
joy_ball_motion();
#endif
}
SDL_Delay(10);
}
close_joystick();
}
void init_joystick()
{
//检查是否有控制杆,检查控制杆数量
//SDL_NumJoysticks 返回控制杆数量
if(SDL_NumJoysticks() < 1)
{
//没有就退出
printf("can't find joystick!\n");
return;
}
//打开控制杆,第一个控制杆从0开始计数
stick = SDL_JoystickOpen(0);
if(stick == NULL)
{
printf("open joystick fail\n");
return;
}
}
//关闭控制杆
void close_joystick()
{
SDL_JoystickClose(stick);
}
//控制杆的轴的范围是-32768到32767,这里认为-8000到8000的范围是中间位置
void joy_axis_motion()
{
if(event.type == SDL_JOYAXISMOTION)
{ //which 为0时表示joystick设备号是0，有时候会有多个设备
if(event.jaxis.which == 0)
{
//左边摇杆x轴方向
if(event.jaxis.axis == 0)
{
if((event.jaxis.value > -8000) && (event.jaxis.value < 8000))
{
//这里认为处于轴的中间位置
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{ //左边的轴向左偏
if(event.jaxis.value < 0)
{
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{//左边的轴向右偏
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
}
}
//左边摇杆y轴方向坐标改变
else if(event.jaxis.axis == 1)
{
if((event.jaxis.value > -8000) && (event.jaxis.value < 8000))
{ //中间位置
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{ //左边的轴向上偏
if(event.jaxis.value < 0)
{
//轴向
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{ //左边的轴向下偏
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
}
}
//ANALOG模式才有
#if ANALOG
//右边摇杆x方向
else if(event.jaxis.axis == 2)
{
if((event.jaxis.value > -8000) && (event.jaxis.value < 8000))
{
//这里认为处于轴的中间位置
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{ //左边的轴向左偏
if(event.jaxis.value < 0)
{
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{//左边的轴向右偏
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
}
}
//右边摇杆y轴方向坐标改变
else if(event.jaxis.axis == 3)
{
if((event.jaxis.value > -8000) && (event.jaxis.value < 8000))
{ //中间位置
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{ //右边的轴向上偏
if(event.jaxis.value < 0)
{
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
else
{ //右边的轴向下偏
printf("event.jaxis.value = %d\n", event.jaxis.value);
}
}
}
#endif
}
}
}
void joy_button_up()
{
//检测松开按键动作
if(event.type == SDL_JOYBUTTONUP)
{ //which 为0时表示joystick设备号是0，有时候会有多个设备
if(event.jbutton.which == 0)
{
switch (event.jbutton.button)
{
case 0: //按键1
printf("button_number = %d\n", 0);
break;
case 1: //按键2
printf("button_number = %d\n", 1);
break;
case 2: //按键3
printf("button_number = %d\n", 2);
break;
case 3: //按键4
printf("button_number = %d\n", 3);
break;
case 4: //按键5
printf("button_number = %d\n", 4);
break;
case 5: //按键6
printf("button_number = %d\n", 5);
break;
case 6: //按键7
printf("button_number = %d\n", 6);
break;
case 7: //按键8
printf("button_number = %d\n", 7);
break;
case 8: //SELECT
printf("button_number = %d\n", 8);
break;
case 9: //START
printf("button_number = %d\n", 9);
break;
case 10: //左边摇杆松开
printf("button_number = %d\n", 10);
break;
case 11: //右边摇杆松开
printf("button_number = %d\n", 11);
break;
}
}
}
}
//=========joystick down==============
void joy_button_down()
{
//检测按键按下的动作
if(event.type == SDL_JOYBUTTONDOWN)
{ //which 为0是表示joystick设备号是0，有时会有多个设备
if(event.jbutton.which == 0)
{
switch (event.jbutton.button)
{
case 0: //按键1
printf("button_number = %d\n", 0);
break;
case 1: //按键2
printf("button_number = %d\n", 1);
break;
case 2: //按键3
printf("button_number = %d\n", 2);
break;
case 3: //按键4
printf("button_number = %d\n", 3);
break;
case 4: //按键5
printf("button_number = %d\n", 4);
break;
case 5: //按键6
printf("button_number = %d\n", 5);
break;
case 6: //按键7
printf("button_number = %d\n", 6);
break;
case 7: //按键8
printf("button_number = %d\n", 7);
break;
case 8: //SELECT
printf("button_number = %d\n", 8);
break;
case 9: //START
printf("button_number = %d\n", 9);
break;
case 10: //左边摇杆按下
printf("button_number = %d\n", 10);
break;
case 11: //右边摇杆按下
printf("button_number = %d\n", 11);
break;
}
}
}
}
//ANALOG模式时
//左边4个按键的value值，上为1，左为2，下位4，右为8
void joy_hat_motion()
{
if(event.type == SDL_JOYHATMOTION)
{
if(event.jhat.which == 0)
{
if(event.jhat.hat == 0)
{
switch (event.jhat.value)
{
case 0: //center
printf("value = %d\n", event.jhat.value);
break;
case 1: //up
printf("value = %d\n", event.jhat.value);
break;
case 3: //rightup
printf("value = %d\n", event.jhat.value);
break;
case 2: //right
printf("value = %d\n", event.jhat.value);
break;
case 6: //rightdown
printf("value = %d\n", event.jhat.value);
break;
case 4: //down
printf("value = %d\n", event.jhat.value);
break;
case 12: //leftdown
printf("value = %d\n", event.jhat.value);
break;
case 8: //left
printf("value = %d\n", event.jhat.value);
break;
case 9: //leftup
printf("value = %d\n", event.jhat.value);
break;
}
}
}
}
}
//使用手头上的joystcik没有测到，具体是什么情况不是很清楚
void joy_ball_motion()
{
if(event.type == SDL_JOYBALLMOTION)
{
printf("ballmotion");
if(event.jball.which == 0)
{
printf("xrel = %d yrel = %d\n", event.jball.xrel, event.jball.yrel);
if(event.jball.ball == 0)
{
printf("xrel = %d yrel = %d\n", event.jball.xrel, event.jball.yrel);
}
if(event.jball.ball == 1)
{
printf("xrel = %d yrel = %d\n", event.jball.xrel, event.jball.yrel);
}
if(event.jball.ball == 2)
{
printf("xrel = %d yrel = %d\n", event.jball.xrel, event.jball.yrel);
}
if(event.jball.ball == 3)
{
printf("xrel = %d yrel = %d\n", event.jball.xrel, event.jball.yrel);
}
}
}
}