c++builder 用png 图片做的窗体背景半透明 加入动画效果

//--------------------------------------------------------------------------- #include <vcl.h> #pragma hdrstop #include "Unit1.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; //--------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { } void ScreenCapture ( void ) { RECT r ; // 声明一个块 GetWindowRect ( GetDesktopWindow () , & r ); // 获取桌面窗口将其放到 r 中 （ R 是一个块） TCanvas * tCanvas = new TCanvas ; // 定义一个新的 canvas tCanvas -> Handle = GetDC ( NULL ); // GetDC 函数返回的是当前窗口客户区的描述表。 Form1 -> img_paint -> Canvas -> CopyRect // 开始复制 ( Rect ( 0,0,Form1 -> img_paint ->Width, Form1 -> img_paint->Height ) , // 复制到图象控件 img1 的指定区域 tCanvas, Rect ( Form1->Left + Form1->img_paint->Left, Form1->Top + Form1->img_paint->Top, Form1->Left + Form1->img_paint->Left + Form1->img_paint ->Width, Form1->Top + Form1->img_paint->Top + Form1->img_paint->Height ) ); //delete tCanvas ; } int last_left=-1; int last_top=-1; //--------------------------------------------------------------------------- void __fastcall TForm1::tmr1Timer(TObject *Sender) { static int count=0; if(last_left!=Left || last_top!=Top) { count=1; } if(count) { count--; ScreenCapture(); last_left=Left; last_top=Top; } else { static int count2=0; if(!((count2++)%5)) { ScreenCapture(); } } /* for(int y=0;y<128;y++) { for(int x=0;x<256;x++) { //这种方式是比较慢的,主要慢在从图片控件取点与画点上 unsigned long color1=img_paint->Canvas->Pixels[x][y]; unsigned long r1=(color1>>16)&0xff; unsigned long g1=(color1>> 8)&0xff; unsigned long b1=(color1>> 0)&0xff; unsigned long color2=img_ss->Canvas->Pixels[x][y]; unsigned long r2=(color2>>16)&0xff; unsigned long g2=(color2>> 8)&0xff; unsigned long b2=(color2>> 0)&0xff; unsigned long per=20; if(y>=64) { per=80; } unsigned long r3=( r1*per + r2*(100-per) )/100; unsigned long g3=( g1*per + g2*(100-per) )/100; unsigned long b3=( b1*per + b2*(100-per) )/100; unsigned long color3=(r3<<16)|(g3<<8)|(b3<<0); img_rs->Canvas->Pixels[x][y]=TColor(color3); } } */ img_2->Left+=2; if(img_2->Left>Width+img_2->Width) { img_2->Left=0-img_2->Width; } img_1->Left-=1; if(img_1->Left<(0-img_1->Width)) { img_1->Left=Width+img_1->Width; } } //--------------------------------------------------------------------------- void __fastcall TForm1::lbl_1Click(TObject *Sender) { this->Close(); } //--------------------------------------------------------------------------- void __fastcall TForm1::img_paintMouseDown(TObject *Sender, TMouseButton Button, TShiftState Shift, int X, int Y) { ReleaseCapture (); SendMessage ( Handle,WM_SYSCOMMAND,SC_MOVE | HTCAPTION,0 ); } //--------------------------------------------------------------------------- void __fastcall TForm1::FormPaint(TObject *Sender) { last_left=-1; last_top=-1; } //--------------------------------------------------------------------------- void __fastcall TForm1::FormCreate(TObject *Sender) { /* HWND hDesktop; hDesktop=FindWindow("Progman",NULL); if(hDesktop) this->ParentWindow=hDesktop; this->BringToFront(); BringWindowToTop(this->Handle); */ } //--------------------------------------------------------------------------- void __fastcall TForm1::FormActivate(TObject *Sender) { last_left=-1; last_top=-1; } //--------------------------------------------------------------------------- void __fastcall TForm1::FormResize(TObject *Sender) { last_left=-1; last_top=-1; } //---------------------------------------------------------------------------