[-blogs-]Cimg代码初探

#include "CImg_demo.h"
// Include CImg library header.
#include "CImg.h"
using namespace cimg_library;
#undef min
#undef max
void main()
{
     cimg::info();
     //各类RGB定值
     const unsigned char
         white[]  = { 255, 255, 255 }, black[] = { 0, 0, 0 },     red[] = { 120, 50, 80 },
         yellow[] = { 200, 155, 0 },   green[] = { 30, 200, 70 }, purple[] = { 175, 32, 186 },
         blue[]   = { 55, 140, 185 },  grey[] = { 127, 127, 127 };
     float
         rx = 0, ry = 0, t = 0, gamma = 0, vgamma = 0, T = 0.9f,
         nrx = (float)(2*cimg::crand()),
         nry = (float)(2*cimg::crand());
     int y0 = 2*13;
     //图像显示
     CImg<unsigned char> back(1,2,1,3,10), fore, text, img;//back fore text img都是界面背景
     back.fillC(0,1,0,10,10,235).resize(640,480,1,3,3).get_shared_channel(2).noise(10,1).draw_plasma();//绿宝石界面
      fore.assign(back.width(),50,1,1,0).draw_text(20,y0-5,"** CImg %u.%u.%u Samples **",grey,0,1,24,
     cimg_version/100,(cimg_version/10)%10,cimg_version%10);
     (fore+=fore.get_dilate(3).dilate(3)).resize(-100,-100,1,3);
     cimg_forXY(fore,x,y)
     if (fore(x,y)==127) fore(x,y,0) = fore(x,y,1) = fore(x,y,2) = 1;
     else if (fore(x,y)) {
     const float val = cimg::min(255.0f,7.0f*(y-3));
     fore(x,y,0) = (unsigned char)(val/1.5f);
     fore(x,y,1) = (unsigned char)val;
     fore(x,y,2) = (unsigned char)(val/1.1f);
     }
    
     fore.resize(back,0).draw_image(20,y0+2*13,text|=text.get_dilate(3)>>4);
     //创建显示的窗体
     CImgDisplay disp(back,"CImg Library Samples",0,false,true);
     disp.move((disp.screen_width()-disp.window_width())/2,(disp.screen_height()-disp.window_height())/2);
     img = back; back*=0.15f;
      for (y0+=2*13; !disp.is_closed() && !disp.is_keyQ() && !disp.is_keyESC(); ) {
           while ( !disp.is_closed() && !disp.is_keyQ() && !disp.is_keyESC()) {
                img*=0.85f; img+=back;
                for (int i = 0; i<60; ++i) {
                    const float
                        mx = (float)(img.width()/2+(img.width()/2-30)*((1-gamma)*std::cos(3*t+rx*i*18.0f*cimg::PI/180) +
                        gamma*std::cos(3*t+nrx*i*18.0f*cimg::PI/180))),
                        my = (float)(img.height()/2+(img.height()/2-30)*((1-gamma)*std::sin(4*t+ry*i*18.0f*cimg::PI/180) +
                        gamma*std::sin(4*t+nry*i*18.0f*cimg::PI/180))),
                        mz = (float)(1.3f + 1.2f*((1-gamma)*std::sin(2*t+(rx+ry)*i*20*cimg::PI/180) +
                        gamma*std::sin(2*t+(nrx+nry)*i*20*cimg::PI/180)));
                    const int j = i%5;
                    //具体画圆
                    img.draw_circle((int)mx,(int)my,(int)(10*mz),j!=0?(j!=1?(j!=2?(j!=3?green:red):yellow):purple):blue,0.2f).
                        draw_circle((int)(mx+4*mz),(int)(my-4),(int)(3*mz),white,0.1f).
                        draw_circle((int)mx,(int)my,(int)(10*mz),black,0.2f,~0U);
                }
                const unsigned char *ptrs = fore.data();
                cimg_for(img,ptrd,unsigned char) 
                { 
                    const unsigned char val = *(ptrs++);
                    if (val) *ptrd = val; 
}
                //显示菜单条
                int y = disp.mouse_y();
                if (y>=y0 && y<y0+27*13) {
                    y = (y/13)*13+7;
                    for (int yy = y-7; yy<=y+6; ++yy) img.draw_rectangle(0,yy,0,1,img.width()-1,yy,0,1,(unsigned char)(130-15*cimg::abs(yy-y)));
                    img.draw_triangle(2,y-4,2,y+4,8,y,yellow).draw_triangle(img.width()-2,y-4,img.width()-2,y+4,img.width()-8,y,yellow);
                }
                gamma+=vgamma; 
                if (gamma>1) 
                { 
                    gamma = vgamma = 0; 
                    rx = nrx;
                    ry = nry; 
                    nrx=(float)(2*cimg::crand());
                    nry=(float)(2*cimg::crand());
                }
                t+=0.006f; T+=0.005f; if (T>1) { T-=(float)(1+cimg::crand()); vgamma = 0.03f; }
                disp.resize(disp,false).display(img).wait(25);
           }
      }
    
     getchar();
}