/*************************************************
函数名：LCD_DrawPoint
功能：画一个点
入口参数：无
返回值：无
*************************************************/
void Gui_DrawPoint(u16 x,u16 y,u16 Data)
{
Lcd_SetXY(x,y);
Lcd_WriteData(Data>>8);
Lcd_WriteData(Data);
}
unsigned int Lcd_ReadPoint(uint16_t x, uint16_t y)
{
unsigned int Data;
Lcd_SetXY(x, y);
Lcd_ReadData();
Data=Lcd_ReadData();
//Lcd_WriteData(Data);
return Data;
}
/*****************************************
TFT
******************************************/
unsigned int Lcd_ReadPoint(u16 x,u16 y)
{
unsigned int Data;
Lcd_SetXY(x,y);
//Lcd_ReadData();//
//Data=Lcd_ReadData();
Lcd_WriteData(Data);
return Data;
}
void Lcd_Puts(unsigned char x,unsigned char y, unsigned char *str) //向1602写一个字符串
{
unsigned char * string = str;
Lcd_SetXY(x,y);
while(*string)
{
Lcd_Write_Data(*string);
string++;
}
}
/**
* @brief Gui draw Line.
* @param x0,y0,x1,y1,Color.
* @retval None
*/
void Gui_DrawLine(uint16_t x0, uint16_t y0,uint16_t x1, uint16_t y1,uint16_t Color)
{
/* -difference in x's
-difference in y's
-dx,dy * 2
-amount in pixel space to move during drawing
-amount in pixel space to move during drawing
-the discriminant i.e. error i.e. decision variable
-used for looping */
int dx,dy,dx2,dy2,x_inc,y_inc,error,index;
LCD_CS_CLR;
Lcd_SetXY(x0,y0);
/* Calculate X distance */
dx = x1-x0;
/* Calculate Y distance */
dy = y1-y0;
if (dx>=0)
{
x_inc = 1;
}
else
{
x_inc = -1;
dx = -dx;
}
if (dy>=0)
{
y_inc = 1;
}
else
{
y_inc = -1;
dy = -dy;
}
dx2 = dx << 1;
dy2 = dy << 1;
if (dx > dy)
{
/* initialize error */
error = dy2 - dx;
/* draw the line */
for (index=0; index <= dx; index++)
{
Gui_DrawPoint(x0,y0,Color);
/* test if error has overflowed */
if (error >= 0)
{
error-=dx2;
/* move to next line */
y0+=y_inc;
}
/* adjust the error term */
error+=dy2;
/* move to the next pixel */
x0+=x_inc;
}
}
else
{
/* initialize error term */
error = dx2 - dy;
/* draw the linedraw the line*/
for (index=0; index <= dy; index++)
{
/* set the pixel */
Gui_DrawPoint(x0,y0,Color);
/* test if error overflowed */
if (error >= 0)
{
error-=dy2;
/* move to next line */
x0+=x_inc;
}
/* adjust the error term */
error+=dx2;
/* move to the next pixel */
y0+=y_inc;
}
}
LCD_CS_SET;
}
//画线函数，使用Bresenham 画线算法
void Gui_DrawLine(u16 x0, u16 y0,u16 x1, u16 y1,u16 Color)
{
int dx, // difference in x's
dy, // difference in y's
dx2, // dx,dy * 2
dy2,
x_inc, // amount in pixel space to move during drawing
y_inc, // amount in pixel space to move during drawing
error, // the discriminant i.e. error i.e. decision variable
index; // used for looping
Lcd_SetXY(x0,y0);
dx = x1-x0;//计算x距离
dy = y1-y0;//计算y距离
if (dx>=0)
{
x_inc = 1;
}
else
{
x_inc = -1;
dx = -dx;
}
if (dy>=0)
{
y_inc = 1;
}
else
{
y_inc = -1;
dy = -dy;
}
dx2 = dx << 1;
dy2 = dy << 1;
if (dx > dy)//x距离大于y距离，那么每个x轴上只有一个点，每个y轴上有若干个点
{//且线的点数等于x距离，以x轴递增画点
// initialize error term
error = dy2 - dx;
// draw the line
for (index=0; index <= dx; index++)//要画的点数不会超过x距离
{
//画点
Gui_DrawPoint(x0,y0,Color);
// test if error has overflowed
if (error >= 0) //是否需要增加y坐标值
{
error-=dx2;
// move to next line
y0+=y_inc;//增加y坐标值
} // end if error overflowed
// adjust the error term
error+=dy2;
// move to the next pixel
x0+=x_inc;//x坐标值每次画点后都递增1
} // end for
} // end if |slope| <= 1
else//y轴大于x轴，则每个y轴上只有一个点，x轴若干个点
{//以y轴为递增画点
// initialize error term
error = dx2 - dy;
// draw the line
for (index=0; index <= dy; index++)
{
// set the pixel
Gui_DrawPoint(x0,y0,Color);
// test if error overflowed
if (error >= 0)
{
error-=dy2;
// move to next line
x0+=x_inc;
} // end if error overflowed
// adjust the error term
error+=dx2;
// move to the next pixel
y0+=y_inc;
} // end for
} // end else |slope| > 1
}
/**
* @brief Draw a point on the lcd.
* @param x,y,Data
* @retval None
*/
void Gui_DrawPoint(uint16_t x,uint16_t y,uint16_t Data)
{
Lcd_SetXY(x,y);
Lcd_WriteData(Data>>8);
Lcd_WriteData(Data);
}
