不过,这里只是用最低级的方式来画,都是通过设置像素的方式来画图,效率很低,不过不影响效果。如果要作为实际开发中使用,请使用像素块贴图方式来画图,本文只提供自定义画刷模板的基本实现。
然后通过两层循环,来控制按照像素块(我们定义的画刷)来依次绘画。一共用了四层循环,最外两层用来控制在客户区循环绘图,里面两层则是循环绘制画刷,最里边的一个函数调用就是设置像素的颜色。如果模板中的值为真(非零,就用1统一表示),0则为假。如果为1,则用红色来设置像素的颜色,如果为0则用白色设置,也就是和背景色一样的颜色,等于没有设置。你可以做一点优化,这里就不提供优化了。
那么整个实现原理,就这么简单。代码也不复杂,就是一个二维数组模板,然后就是四层循环和一个设置像素颜色函数使用。前面用了客户区大小的获取函数,其他都是基本Win32程序的结构,无须多讲。
下面来看看实现的效果图,因为我懒得麻烦,就只画了一部分自定义画刷:
【外单线实心心红心画刷】
【单线空心红心画刷】
【双线空心红心画刷】
【C++技术字样的画刷】
【C++字样的画刷】
#include "windows.h"
#include <tchar.h>
// - 项目是Unicode字符集
LRESULT CALLBACK WinProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
TCHAR Info[100]=_T("C++技术网http://www.cjjjs.com");
RECT rect;
switch (message)
{
case WM_PAINT:
{
#define ROW 20
#define COL 21
hdc = BeginPaint(hwnd,&ps);
GetClientRect(hwnd,&rect);
int templateBrush[ROW][COL]={
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,0,
0,0,0,1,0,0,0,0,1,0,0,1,0,0,0,0,1,0,0,0,0,
0,0,1,0,0,1,1,1,0,1,1,0,1,1,1,0,0,1,0,0,0,
0,1,0,0,1,1,1,1,1,0,0,1,1,1,1,1,0,0,1,0,0,
0,1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,0,0,
0,1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,0,0,
0,1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,0,0,
0,0,1,0,0,1,1,1,1,1,1,1,1,1,1,0,0,1,0,0,0,
0,0,0,1,0,0,1,1,1,1,1,1,1,1,0,0,1,0,0,0,0,
0,0,0,0,1,0,0,1,1,1,1,1,1,0,0,1,0,0,0,0,0,
0,0,0,0,0,1,0,0,1,1,1,1,0,0,1,0,0,0,0,0,0,
0,0,0,0,0,0,1,0,0,1,1,0,0,1,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
for(int i=0;i<rect.right;i+=COL)
{
for (int j=0;j<rect.bottom;j+=ROW)
{
for (int n=0;n<COL;n++)
{
for (int m=0;m<ROW;m++)
{
SetPixel(hdc,i+n,j+m,templateBrush[m][n]?RGB(255,0,0):RGB(255,255,255));
}
}
}
}
EndPaint(hwnd,&ps);
}
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrev,LPSTR lpCmd,int iShow)
{
TCHAR ClassName[] = _T("MyClass");
TCHAR title1[] = _T("C++技术网http://www.cjjjs.com");
WNDCLASS wndClass;
wndClass.cbClsExtra=0;
wndClass.cbWndExtra=0;
wndClass.hbrBackground= (HBRUSH)GetStockObject(WHITE_BRUSH);
wndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndClass.hInstance = hInstance;
wndClass.lpfnWndProc = WinProc;
wndClass.lpszClassName = ClassName;
wndClass.lpszMenuName=NULL;
wndClass.style=CS_HREDRAW|CS_VREDRAW;
if(!RegisterClass(&wndClass))return 0;
HWND hwnd = CreateWindow(ClassName,title1,WS_OVERLAPPEDWINDOW,0,0,440,400,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}