Question

C++中怎么定义setpixel

Answer 1

#include <Windows.h>
#include <math.h>

void drawCircle(HWND hWnd){
HDC hdc=GetDC(hWnd);
RECT rc; GetClientRect(hWnd,&rc); int xo=rc.right/2, yo=rc.bottom/2;
int r=50, x=0,y=0;
float a=0, da=3.1415/32; DWORD co=0x0000FF;
for(int i=0; i<64; i++){
x=xo+r*cos(a), y=yo+r*sin(a);
SetPixel(hdc,x,y,co); co+=0x020300; // SetPixel的三个参数 ......
a+=da;
}
ReleaseDC(hWnd,hdc);
}