以下代码出现在我的 WinProc:
if(message == WM_CREATE)
{
//Do WM_CREATE stuff
}
else
{
switch(message)
{
case WM_KEYDOWN:
{
switch(wParam)
{
case VK_LEFT:
{
//declare new variable here
D2D1_RECT_F bounds;
HRESULT hr = pDemoApp->mpGeometryGroup->GetBounds(pDemoApp->mTransform, &bounds);
}
}
}
}
}
这种声明和使用变量的方式有问题吗?
我在声明和使用bounds之后设置了断点(仍在作用域内),但是在调试器的“Locals”窗口中似乎找不到它。出了什么问题?
我不想在帖子中发布一堆无关的代码,但这是完整的WinProc。
LRESULT CALLBACK DemoApp::WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
LRESULT result = 0;
if (message == WM_CREATE)
{
LPCREATESTRUCT pcs = (LPCREATESTRUCT)lParam;
DemoApp *pDemoApp = (DemoApp *)pcs->lpCreateParams;
::SetWindowLongPtrW(
hwnd,
GWLP_USERDATA,
PtrToUlong(pDemoApp)
);
result = 1;
}
else
{
DemoApp *pDemoApp = reinterpret_cast<DemoApp *>(static_cast<LONG_PTR>(
::GetWindowLongPtrW(
hwnd,
GWLP_USERDATA
)));
bool wasHandled = false;
if (pDemoApp)
{
switch (message)
{
case WM_SIZE:
{
UINT width = LOWORD(lParam);
UINT height = HIWORD(lParam);
pDemoApp->OnResize(width, height);
}
result = 0;
wasHandled = true;
break;
case WM_DISPLAYCHANGE:
{
InvalidateRect(hwnd, NULL, FALSE);
}
result = 0;
wasHandled = true;
break;
case WM_PAINT:
{
pDemoApp->OnRender();
ValidateRect(hwnd, NULL);
}
result = 0;
wasHandled = true;
break;
case WM_KEYDOWN:
{
D2D1_SIZE_F rtSize = pDemoApp->mpRenderTarget->GetSize();
static float angle = 0.0f;
switch(wParam)
{
case VK_LEFT:
{
angle -= 90;
if(angle < -360)
angle = 0;
D2D1_RECT_F bounds;
HRESULT hr = pDemoApp->mpGeometryGroup->GetBounds(pDemoApp->mTransform, &bounds);
pDemoApp->mTransform = D2D1::Matrix3x2F::Rotation(
angle,
D2D1::Point2F((bounds.right + bounds.left)/2, (bounds.bottom + bounds.top)/2)
);
hr = hr;
InvalidateRect(hwnd, NULL, FALSE);
break;
}
case VK_RIGHT:
{
angle += 90;
if(angle > 360)
angle = 0;
D2D1_RECT_F bounds;
pDemoApp->mpGeometryGroup->GetBounds(pDemoApp->mTransform, &bounds);
pDemoApp->mTransform = D2D1::Matrix3x2F::Rotation(
angle,
D2D1::Point2F((bounds.right + bounds.left)/2, (bounds.bottom + bounds.top)/2)
);
InvalidateRect(hwnd, NULL, FALSE);
break;
}
case VK_DOWN:
{
pDemoApp->mTransform = pDemoApp->mTransform * D2D1::Matrix3x2F::Translation(
0.0f,
5.0f);
InvalidateRect(hwnd, NULL, FALSE);
break;
}
}
}
result = 0;
wasHandled = true;
break;
case WM_LBUTTONDOWN:
{
FLOAT xPos, yPos;
xPos = LOWORD(lParam);
yPos = HIWORD(lParam);
BOOL contains = false;
pDemoApp->mpGeometryGroup->FillContainsPoint(
D2D1::Point2F(xPos, yPos),
pDemoApp->mTransform,
&contains);
if(contains)
MessageBoxA(hwnd, "Hooray!", NULL, NULL);
D2D1_GEOMETRY_RELATION relation;
pDemoApp->mpGeometryGroup->CompareWithGeometry(
pDemoApp->mpSecondGeometryGroup,
pDemoApp->mTransform,
0.001f,
&relation);
if(relation == D2D1_GEOMETRY_RELATION_CONTAINS ||
relation == D2D1_GEOMETRY_RELATION_IS_CONTAINED ||
relation == D2D1_GEOMETRY_RELATION_OVERLAP)
{
MessageBoxA(hwnd, "overlap or contains.", 0, 0);
}
}
result = 0;
wasHandled = true;
break;
case WM_DESTROY:
{
PostQuitMessage(0);
}
result = 1;
wasHandled = true;
break;
}
}
if (!wasHandled)
{
result = DefWindowProc(hwnd, message, wParam, lParam);
}
}
return result;
}
GetBounds
返回,它可能会跳出包含边界的“范围”。请在此行后面加上hr = hr;
并查看是否有所帮助。 - Mooing Duck