LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
static RECT rect,rect2,rect3;
static cxClient, cyClient;
static HBRUSH hBrush, hOldBrush;
POINT pt;
switch (message)
{
case WM_SIZE:
cxClient =
LOWORD(lParam);
cyClient =
HIWORD(lParam);
break;
case WM_LBUTTONDOWN:
pt.x =
LOWORD(lParam);
pt.y =
HIWORD(lParam);
if (PtInRect(&
rect2,pt))
{
MessageBox(NULL, L"clicked", L
"info", NULL);
}
break;
case WM_PAINT:
hdc = BeginPaint(hwnd, &
ps);
//处理矩形
// rect.left = cxClient / 2 - 50;
// rect.right = cxClient / 2 + 50;
// rect.top = cyClient / 2 - 50;
// rect.bottom = cyClient / 2 + 50;
hBrush = CreateSolidBrush(RGB(
255,
0,
0));
//1.fillrect 填充矩形
//FillRect(hdc, &rect, hBrush);
//2.framerect 改画笔为画刷来绘制边框
//FrameRect(hdc, &rect, hBrush);
//3.invertrect 翻转矩形内所有的像素
//InvertRect(hdc, &rect);
//4.生成矩形SetRect
SetRect(&rect, cxClient /
2 -
50, cyClient /
2 -
50, cxClient/
2 +
50, cyClient/
2 +
50);
//5.偏移矩形OffsetRect
OffsetRect(&rect, -
150, -
150);
FillRect(hdc, &
rect, hBrush);
InvertRect(hdc, &rect);
//先显示图像，后翻转
//6.增大减小，长宽同时InflateRect
SetRect(&rect, cxClient /
2 -
50, cyClient /
2 -
50, cxClient /
2 +
50, cyClient /
2 +
50);
InflateRect(&rect,
50,
30);
FillRect(hdc, &
rect, hBrush);
//7.setrectEmpty 设置矩形为空
FillRect(hdc, &rect, hBrush);
//不会显示
//8.copyrect 多用在映射中
CopyRect(&rect2, &rect);
//将rect的坐标拷贝给rect2
SetRectEmpty(&rect);
//将矩形的各个坐标设为0,则会显示rect2
hBrush = CreateSolidBrush(RGB(
255,
255,
0));
FillRect(hdc, &
rect2, hBrush);
//9.intersectrect 两个矩形交集
//10.unionrect 两个矩形并集
//11.Isrectempty 判断是否为空
//12.ptinrect 判断点是否在矩形中（重要）
EndPaint(hwnd, &
ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
转载于:https://www.cnblogs.com/ssyfj/p/8511978.html
