[ESK32-360 Review] + TFT screen display function and expansion (2)

jinglixixi

[ESK32-360 Review] + TFT screen display function and expansion (2) [Copy link]

 

2. Extension of drawing functions

To implement the drawing function, first add the point drawing function, then add the line drawing function and the area filling function.

The added point drawing function is:

void LCD_dotDraw(u16 X_Location, u16 Y_Location, u16 Color)
{
    LCD_StarterSet(X_Location, Y_Location);
 LCD_WriteRAMPrior();
 LCD_WriteRAM(Color);
}

The added line drawing function is:

void LCD_DrawLine(u16 x1, u16 y1, u16 x2, u16 y2, u16 Color)
{
 u16 t;
 s16 xerr=0,yerr=0,delta_x,delta_y,distance;
 u16 incx,incy,uRow,uCol;
 delta_x=x2-x1;
 delta_y=y2-y1;
 uRow=x1;
 uCol=y1;
 if(delta_x>0)incx=1;
 else if(delta_x==0)incx=0;
 else { incx=-1; delta_x=-delta_x; }

 if(delta_y>0)incy=1;
 else if(delta_y==0)incy=0;
 else { incy=-1; delta_y=-delta_y; }

 if( delta_x>delta_y) distance=delta_x;
 else distance=delta_y;

 for(t=0;t<=distance+1;t++)
 {
 LCD_dotDraw(uRow,uCol,Color);
 xerr+=delta_x ;
 yerr+=delta_y ;
 if(xerr>distance)
 {
 xerr-=distance;
 uRow+=incx;
 }
 if(yerr>distance)
 {
 yerr-=distance;
 uCol+=incy;
 }
 }
}

Added area filling function:

void LCD_fill(u16 x,u16 y,u16 Height,u16 Width,u16 Color)
{
 u16 i,j;

 for(j=0;j<Height;j++)
 {
LCD_StarterSet(x,y);
 LCD_WriteRAMPrior();
 for (i = Width; i > 0; i--)
 {
 LCD_WriteRAM(Color);
 }
x++;
 }
}

With these three functions, we can easily display the waveform of the data when performing A/D acquisition. See you later!

宋元浩

You can try to port littlevgl, it will be enough if it has some drawing functions

jinglixixi

Song Yuanhao posted on 2020-8-7 09:55 You can try to port littlevgl. It is enough to have some drawing functions

I haven’t had much contact with it before, I’ll learn more about it later.