/********************************** LCD12864曲線顯示*******************************************/
/*********作者：王勝文。QQ：95201972  email：nunk@163.com 希望與大家交流2007。08。03**********/


#include<reg51.h>
#include<drive_functions.h>
#include<math.h>
//#include<get_keys.h>
#define Graphic_Clear 0x01   //檫除點
#define Graphic_Not 0x02     //反相點
#define Graphic_Draw 0x03	 //畫點

uchar j=0,i=0;
uchar r=32;
/***********************在LCD上任意坐標畫點********************************/

void DrawPoint(uchar X,uchar Y,uchar Type) 
{ 									//X，Y化點的坐標Type畫點的類型：反相點，檫除點，畫點
                                                    
   uchar DX = (Y >> 3);               //計算出屬于哪個字節 
   uchar BX = Y - (DX << 3);           //計算出屬于字節哪一位 
   uchar TempData = 0; 
    
    
   if (X > 63) 
   { 
    chip_select=2;
      X -= 64; 
   } 
   else 
   { 
      chip_select=1; 
   } 

   SetPage(DX);             //設行地址
   SetColumn(X); 			//設列地址
    
   TempData = ReadData();   //讀出所畫點所在字節的內容
    
   switch (Type)            //對該字節進行相應操作
   { 
       case Graphic_Clear:
          					TempData &= ~(1<<BX); 
         					break; 
      case Graphic_Not:
         					TempData ^= (1 << BX); 
          					break; 
      case Graphic_Draw: 
          					TempData |= (1 << BX);  
							break;
	  default:				break;
   } 
    
   SetPage(DX);            //設置行地址
   SetColumn(X);  			//設置列地址
   WriteData(TempData); 	//把修改后的字節送回LCD，達到畫點目的
} 

/********插值法畫任意兩點之間直線的函數，函數中只用加減法，程序運行效率很高**********/

DrawLine(uchar x1,uchar y1,uchar x2,uchar y2)
{                           //x1,y1起點坐標；x2,y2終點坐標；
    uchar x,y; 
    uchar d_x,d_y;     	
    uchar err=0;
    uchar temp=0;

    if(y2<y1){x=x1;y=y1;x1=x2;y1=y2;x2=x;y2=y;}
    d_y=y2-y1;
    if (d_y==0)
        {
        if (x1>x2) {x=x1;x1=x2;x2=x;}
        for ( x=x1;x<=x2;x++ ) DrawPoint(x,y1,Graphic_Draw);
        }
    else
        {
    if(x2>=x1){temp=1;d_x=x2-x1;}else d_x=x1-x2;
    x=x1;y=y1;DrawPoint(x,y,Graphic_Draw);
    if(temp&&(d_y<=d_x))
        while(x!=x2)
            {if(err<0){x=x+1;err=err+(y2-y);}
            else {x=x+1;y=y+1;err=err+(y2-y)-(x2-x);}
            DrawPoint(x,y,Graphic_Draw);
            }
    else if(temp&&(d_y>d_x))
        while(y!=y2)
            {d_x=x2-x;d_y=y2-y; 
            if(err<0){x=x+1;y=y+1;err=err+d_y-d_x;}
            else {y=y+1;err=err-d_x;}
            DrawPoint(x,y,Graphic_Draw);
            }
    else if(!temp&&(d_y<=d_x))
        while(x!=x2)
            {d_x=x-x2;d_y=y2-y; 
            if(err<0){x=x-1;err=err+d_y;}
            else {x=x-1;y=y+1;err=err+d_y-d_x;}
            DrawPoint(x,y,Graphic_Draw);
            }
    else if(!temp &&(d_y>d_x))
        while(y!=y2)
            {d_x=x-x2;d_y=y2-y; 
            if(err<0){x=x-1;y=y+1;err=err+d_y-d_x;}
            else {y=y+1;err=err-d_x;}
            DrawPoint(x,y,Graphic_Draw);
            }
        }    
}                                  


/***********************************************************************/

void DrawLevel(void)
{

for(i=0;i<127;i++){DrawPoint(i,32,Graphic_Draw);}//畫水平直線

}

/************************************************************************************/

void DrawSineWave(void)
{
	uchar xn=0;
	uchar yn=32;
	uchar i;
	uchar xi,yi;
for(i=0;i<127;i++)
	{
		xi=i;
		yi=(sin(i*0.1)*32)+32;

		DrawLine(xn,yn,xi,yi);      //在一系列零散的點上，兩點兩點之間連線，從而得到一條曲線
		
		xn=i;
		yn=yi;
		
		}  
		}

/*************************************************************************************/

void DrawCircle(uchar x0,uchar y0,uchar r)//x0,y0為圓心坐標，r為圓半徑
{
uchar xn,yn,xi,yi;
unsigned int j;

xn=cos(0)*r+x0;
yn=sin(0)*r+y0;

for(j=0;j<630;j++)
	{
		xi=(cos(j*0.01)*r)+x0;
		yi=(sin(j*0.01)*r)+y0;

		DrawLine(xn,yn,xi,yi);      //在一系列零散的點上，兩點兩點之間連線，從而得到一條曲線
		
		xn=xi;
		yn=yi;
}

}

/**************************************************************************************************/

void DrawRetic(uchar x0,uchar y0,uchar x1,uchar y1)//畫正方形，x0,y0為左上角坐標，x1,y1為右下角坐標
{
	uchar i;
	for(i=0;i<=x1-x0;i++){  DrawPoint(x0+i,y0,Graphic_Draw);  DrawPoint(x0+i,y1,Graphic_Draw);  }
	for(i=0;i<=y1-y0;i++){  DrawPoint(x0,y0+i,Graphic_Draw);  DrawPoint(x1,y0+i,Graphic_Draw);  }
	}


/**************************************************************************************************/

void DrawTrigle(uchar x1,uchar y1,uchar x2,uchar y2,uchar x3,uchar y3)//畫三角形，三個坐標為三角形頂點
{
//	DrawLine(x1,y1,x2,y2);
//	DrawLine(x2,y2,x3,y3);
//	DrawLine(x1,y1,x3,y3);
	
}

/******************************** main **********************************************************/

void main(void)
{

ClearLCD();

while(1)
{

ClearLCD();
DrawLevel();
DrawLine(63,0,63,63);
DrawSineWave();

//DrawCircle(63,32,r);
//r-=4;
//}

//DrawRetic(10,10,30,30);
//DrawTrigle(0,0,80,60,120,0);
}

}