S3C2440 测试程序（六） LCD显示实验2_触摸小图片切换大图片 -

实验效果：
点击屏幕中的6副小图片，可将该小图片切换成全屏图片。
1、欲实现小图片，需将原来图片压缩，此处压缩成原来的1/8。代码如下：

本文引用地址: http://www.21ic.com/app/mcu/201807/784563.htm

void Paint_Bmp_Small(int x0,int y0,int h,int l,int k,unsigned char bmp[])

{
//从[x0,y0]至[h/k,l/k]为止被显示被压缩了1/k的图片

int x,y;

U32 c;

int p = 0;

h = h/k;

l = l/k;

for( y = 0 ; y < l ; y++ ) // l=240/k
{

for( x = 0 ; x < h ; x++ ) // h=320/k

{

c = bmp[p+1] | (bmp[p]<<8) ; // bmp[] 680个为1line，总的480line

if ( ( (x0+x) < SCR_XSIZE_TFT) && ( (y0+y) < SCR_YSIZE_TFT) )

LCD_BUFFER[y0+y][x0+x] = c ;

p = p + 2*k ; //每line的每2个像素都跳过K个值

}

p = p+640*(k-1); //640个为1line，就是说每2line中间都跳过K-1个line

}

}

2、在原有触摸屏取坐标值程序中添加截取此6张图的点击区域的代码：

if((xdata-xdata_save > 5)||(xdata-xdata_save < -5)
||(ydata-ydata_save > 5)||(ydata-ydata_save < -5))

{

Uart_Printf("X_value = %d,Y_value = %d,X_data = %d,Y_data = %dn",xdata,ydata,xdata_save,ydata_save);

if(( xdata >= 135)&&( xdata <= 226))

{
// 6张图的坐标区域

if(( ydata >=91 )&&( ydata <= 205))

gPictureNum = 1;

else if(( ydata >=233 )&&( ydata <= 347))

gPictureNum = 2;

else if(( ydata >=375 )&&( ydata <= 489))

gPictureNum = 3;

else if(( ydata >=517 )&&( ydata <= 631))

gPictureNum = 4;

else if(( ydata >=659 )&&( ydata <= 773))

gPictureNum = 5;

else if(( ydata >=802 )&&( ydata <= 916))

gPictureNum = 6;

}

}
3、主程序显示代码：

while(1)

{

if(gPictureNum)

{

switch(gPictureNum)

{

case 1:

LCD_displayScreen(0,0,0);

Paint_Bmp(0,0,320,240,picture1_320_240);

break;

case 2:

LCD_displayScreen(0,0,0);

Paint_Bmp(0,0,320,240,picture2_320_240);

break;

case 3:

LCD_displayScreen(0,0,0);
Paint_Bmp(0,0,320,240,picture3_320_240);
break;

case 4:

LCD_displayScreen(0,0,0);

Paint_Bmp(0,0,320,240,picture4_320_240);

break;

case 5:

LCD_displayScreen(0,0,0);

Paint_Bmp(0,0,320,240,picture5_320_240);

break;

case 6:

LCD_displayScreen(0,0,0);

Paint_Bmp(0,0,320,240,picture6_320_240);

break;

default:

LCD_displayScreen(0,0,0);

Uart_Printf("Clear Screen! n");

}

gPictureNum = 0;

}

Paint_Bmp_Small(20,200,320,240,8,picture6_320_240);

Paint_Bmp_Small(70,200,320,240,8,picture5_320_240);

Paint_Bmp_Small(120,200,320,240,8,picture4_320_240);

Paint_Bmp_Small(170,200,320,240,8,picture3_320_240);

Paint_Bmp_Small(220,200,320,240,8,picture2_320_240);

Paint_Bmp_Small(270,200,320,240,8,picture1_320_240);

}

}