//use chain as state machines to slice a single task to many frames

void DrawStart(void){//draw start screen
        if(d==0){//reset menu
            SelSong=0;
            SelLevel=0;
            if (clean==1){cleanscreen();} //clean screen
            else d++;
        }
        else if(d==1){//print title1
            video_puts(50,16,parapara);
            d++;
        }
        else if(d==2){//init menu
            video_puts(15,51,SetSong);
            video_puts(15,61,song0);
            d++;
        }
        else if(d==3){
            video_puts(15,71,song1);
            video_puts(15,81,song2);
            d++;
        }
        else if(d==4){
            video_puts(70,51,level); 
            video_puts(70,61,practice); 
            d++;
        }
        else if(d==5){
            video_puts(70,71,basic);
            video_puts(70,81,hard);
            d++;
        }
        else if(d==6){ 
            video_putchar(5, 61, 40); 
            video_putchar(60, 61, 40);
            d++;
        }
        else if(d==7){//init highlight effects
            video_highlight(14,61+10*SelSong,46,67+10*SelSong);
            d++;
        }
        else if(d==8){
            video_highlight(69,61+10*SelLevel,106,67+10*SelLevel);
            d++;
        }
        else if(d==9){//draw logo
            video_putarrow(10,16,10);
            video_putarrow(17,16,11);
            video_putarrow(24,16,12);
            video_putarrow(31,16,13);
            d++;
        }
        else if(d==10){//draw logo
            video_putarrow(10,23,14);
            video_putarrow(17,23,15);
            video_putarrow(24,23,16);
            video_putarrow(31,23,17);
            d++;
        }
        else if(d==11){//print title2
            video_puts(58,30,revolution);
            d++;
        }
        else if(d==12){//draw screen finished
            d=0;
            draw=0;
        }
}
void DrawPlaying(void){//draw playing mode screen
     if (d==0){
            if (clean==1){cleanscreen();} //clean screen first
            else d++;
     }
     else if (d==1){//init animation edges
            video_line(43,1,43,98,1);
            video_line(85,1,85,98,1); 
            video_line(64,1,64,98,1); 
            video_line(43,10,85,10,1); 
            video_line(43,20,85,20,1); 
            d++;
     }
     else if (d==2){//statistic information 
            video_putsmalls(4,60,perfect1);
            video_putsmalls(88,60,perfect1);
            video_putsmalls(4,76,good1);
            video_putsmalls(88,76,good1);
            video_putsmalls(4,84,miss1);
            video_putsmalls(88,84,miss1);
            d++;
     }
     else if (d==3){//the pattern of detecting hands waving
            video_putarrow(30,8,1); 
            video_putarrow(20,16,3);
            video_putarrow(30,24,7);
            d++;
     }
     else if (d==4){
            video_putarrow(90,8,1); 
            video_putarrow(100,16,5); 
            video_putarrow(90,24,7);
            d++;
     }
     else if (d==5){//init animation arrows
            lpat[0]=pattern[SelSong][0][0];
            rpat[0]=pattern[SelSong][1][0];
            lpat[1]=pattern[SelSong][0][1];
            rpat[1]=pattern[SelSong][1][1];
            lpat[2]=pattern[SelSong][0][2];
            rpat[2]=pattern[SelSong][1][2];
            lpat[3]=pattern[SelSong][0][3];
            rpat[3]=pattern[SelSong][1][3];
            lpat[4]=pattern[SelSong][0][4];
            rpat[4]=pattern[SelSong][1][4];
            ypos[0]=15;
            ypos[1]=33;
            ypos[2]=51;
            ypos[3]=69;
            ypos[4]=87;
            patflag=0;
            patnum=4;
            d++;
     }
     else if (d==6){//draw arrows
            video_putarrow(xl,ypos[0],lpat[0]);
            video_putarrow(xr,ypos[0],rpat[0]);
            video_putarrow(xl,ypos[1],lpat[1]);
            video_putarrow(xr,ypos[1],rpat[1]); 
            video_putarrow(xl,ypos[2],lpat[2]);
            video_putarrow(xr,ypos[2],rpat[2]); 
            video_putarrow(xl,ypos[3],lpat[3]);
            video_putarrow(xr,ypos[3],rpat[3]); 
            video_putarrow(xl,ypos[4],lpat[4]);
            video_putarrow(xr,ypos[4],rpat[4]);
            d++;
     }
     else if (d==7){//reset time, statistics data, animation variables, sensors signals
            minute=time_minute;
            sec=time_second;
            compare_pat=0;
            L_done=0;
            R_done=0;
            L_good=0; 
            R_good=0;
            L_perfect=0;
            R_perfect=0;
            L_miss=0;
            R_miss=0;
            time=0; 
            patflag=0;
            compare_pat=patflag+1;
            patnum=0;
            state_y_R=no_state_y_R;
            state_z_R=no_state_z_R;
            state_y_L=no_state_y_L;
            state_z_L=no_state_z_L;
            axis_flag=0;
            LHU=0;
            LHR=0;
            LHD=0;
            LHL=0;
            RHU=0;
            RHR=0;
            RHD=0;
            RHL=0;
            d=0;
            draw=0;
     }
}
void DrawResult(void){//draw statistic screen and calculate result
        if(d==0){
            if (clean==1) cleanscreen();//clean screen first
            else d++;       
        }
        else if(d==1){//init screen
            video_puts(30,11,statistics);
            video_puts(30,81,score); 
            d++;
        }
        else if(d==2){
            video_puts(5,41,hitrate);
            video_puts(5,51,good1);    
            d++;
        }
        else if(d==3){
            video_puts(64,31,left);
            video_puts(92,31,right);
            d++;
        }
        else if(d==4){
            video_puts(5,71,miss1);
            video_puts(5,61,perfect1);
            d++;
        }
        else if(d==5){//calculate hit rates for both hands
            L_hitrate=100*(L_good+L_perfect)/(L_good+L_perfect+L_miss); 
            d++;
        }
        else if(d==6){
            R_hitrate=100*(R_good+R_perfect)/(R_good+R_perfect+R_miss); 
            d++;
        }
        else if(d==7){//calculate scores
            final_score=(L_perfect+R_perfect)*4+(L_good+R_good)*3+(R_hitrate+L_hitrate);
            d++;
        }
        else if(d==8){
            final_score=final_score*(4+(int)SelLevel);
            d++;
        }
        else if(d==9){
            sprintf(ts,"%d",final_score );
            video_puts(70,81,ts);
            d++;
        }
        else if(d==10){//print result
            sprintf(ts,"%d",R_perfect );
            video_puts(96,61,ts);
            sprintf(ts,"%d",R_miss );
            video_puts(96,71,ts);
            sprintf(ts,"%d",L_perfect );
            video_puts(72,61,ts);
            sprintf(ts,"%d",L_miss );
            video_puts(72,71,ts);
            d++;
        }
        else if(d==11){
            sprintf(ts,"%d\%",R_hitrate );
            video_puts(96,41,ts); 
            sprintf(ts,"%d",R_good );
            video_puts(96,51,ts);
     
            sprintf(ts,"%d\%",L_hitrate );
            video_puts(72,41,ts); 
            sprintf(ts,"%d",L_good );
            video_puts(72,51,ts);
            d++;
        }
        else if(d==12){
            d=0;
            draw=0;
            
        }
}