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Add test of setting clipping region for transformed (rotated) wxGraphicsContext

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See #17622
This commit is contained in:
Artur Wieczorek
2016-08-09 20:49:58 +02:00
parent 0f31e05cb8
commit e3be67a756
1 changed files with 78 additions and 2 deletions
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80
tests/graphics/clippingbox.cpp
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@@ -100,11 +100,11 @@ public:
virtual void setUp() { wxASSERT( m_dc ); }
virtual wxDC* GetDC(wxMemoryDC* dc) = 0;
private:
protected:
void CheckBox(int x, int y, int width, int height,
const wxBitmap& bmpRef = wxNullBitmap, int posTolerance = 0);
void CheckClipWithBitmap(const wxBitmap& bmpRef, int posTolerance = 0);
protected:
void InitialState();
void InitialStateWithTransformedDC();
void OneRegion();
@@ -258,6 +258,8 @@ protected:
m_gcdc->GetGraphicsContext()->Flush();
}
void OneRegionWithRotatedGC();
private:
CPPUNIT_TEST_SUITE( ClippingBoxTestCaseGCDC );
CPPUNIT_TEST( InitialState );
@@ -269,6 +271,7 @@ private:
CPPUNIT_TEST( OneRegionAndReset );
CPPUNIT_TEST( OneRegionAndEmpty );
CPPUNIT_TEST( OneRegionWithTransformedDC );
CPPUNIT_TEST( OneRegionWithRotatedGC );
CPPUNIT_TEST( TwoRegionsOverlapping );
CPPUNIT_TEST( TwoRegionsOverlappingNegDim );
CPPUNIT_TEST( TwoRegionsNonOverlapping );
@@ -329,6 +332,7 @@ private:
CPPUNIT_TEST( OneRegionAndReset );
CPPUNIT_TEST( OneRegionAndEmpty );
CPPUNIT_TEST( OneRegionWithTransformedDC );
CPPUNIT_TEST( OneRegionWithRotatedGC );
CPPUNIT_TEST( TwoRegionsOverlapping );
CPPUNIT_TEST( TwoRegionsOverlappingNegDim );
CPPUNIT_TEST( TwoRegionsNonOverlapping );
@@ -393,6 +397,7 @@ private:
CPPUNIT_TEST( OneRegionAndReset );
CPPUNIT_TEST( OneRegionAndEmpty );
CPPUNIT_TEST( OneRegionWithTransformedDC );
CPPUNIT_TEST( OneRegionWithRotatedGC );
CPPUNIT_TEST( TwoRegionsOverlapping );
CPPUNIT_TEST( TwoRegionsOverlappingNegDim );
CPPUNIT_TEST( TwoRegionsNonOverlapping );
@@ -449,6 +454,7 @@ private:
CPPUNIT_TEST( OneRegionAndReset );
CPPUNIT_TEST( OneRegionAndEmpty );
CPPUNIT_TEST( OneRegionWithTransformedDC );
CPPUNIT_TEST( OneRegionWithRotatedGC );
CPPUNIT_TEST( TwoRegionsOverlapping );
CPPUNIT_TEST( TwoRegionsOverlappingNegDim );
CPPUNIT_TEST( TwoRegionsNonOverlapping );
@@ -719,6 +725,30 @@ void ClippingBoxTestCaseBase::CheckBox(int x, int y, int width, int height,
#endif // wxUSE_IMAGE
}
void ClippingBoxTestCaseBase::CheckClipWithBitmap(const wxBitmap& bmpRef, int posTolerance)
{
// Update wxDC contents.
FlushDC();
#if wxUSE_IMAGE
wxImage img = m_bmp.ConvertToImage();
// If reference bitmap is given then it has to be
// compared with current bitmap.
if ( bmpRef.IsOk() )
{
wxImage imgRef = bmpRef.ConvertToImage();
// Figures created by clipping and drawing procedures
// can be slightly different (shifted by few pixels) due
// to the different algorithms they can use so we need
// to perform a "fuzzy" comparison of the images,
// tolerating some drift of the pixels.
if ( !CompareImageFuzzy(img, imgRef, posTolerance) )
CPPUNIT_FAIL( "Invalid shape of the clipping region" );
}
#endif // wxUSE_IMAGE
}
// Actual tests
void ClippingBoxTestCaseBase::InitialState()
@@ -1222,3 +1252,49 @@ void ClippingBoxTestCaseBase::TwoDevRegionsNonOverlappingNegDim()
m_dc->Clear();
CheckBox(0, 0, 0, 0);
}
void ClippingBoxTestCaseGCDC::OneRegionWithRotatedGC()
{
// Setting one rectangular clipping region for rotated graphics context.
const double rotAngle = 1.0*M_PI/180.0;
const int rectX = 16;
const int rectY = 14;
const int rectW = 60;
const int rectH = 55;
// Draw image with reference rectangle (rotated).
wxBitmap bmpRef(s_dcSize);
{
wxMemoryDC memDC(bmpRef);
wxGraphicsRenderer* r = m_gcdc->GetGraphicsContext()->GetRenderer();
wxGraphicsContext* gcRef = r->CreateContext(memDC);
gcRef->SetAntialiasMode(wxANTIALIAS_NONE);
gcRef->DisableOffset();
gcRef->SetBrush(wxBrush(s_bgColour, wxBRUSHSTYLE_SOLID));
gcRef->SetPen(*wxTRANSPARENT_PEN);
gcRef->DrawRectangle(0, 0, s_dcSize.GetWidth(), s_dcSize.GetHeight());
gcRef->Rotate(rotAngle);
gcRef->SetBrush(wxBrush(s_fgColour, wxBRUSHSTYLE_SOLID));
gcRef->SetPen(wxPen(s_fgColour));
gcRef->DrawRectangle(rectX, rectY, rectW, rectH);
delete gcRef;
}
// Set clipping region for rotated wxGC.
wxGraphicsContext* gc = m_gcdc->GetGraphicsContext();
gc->SetAntialiasMode(wxANTIALIAS_NONE);
gc->DisableOffset();
gc->Rotate(rotAngle);
gc->Clip(rectX, rectY, rectW, rectH);
// Fill in clipping region.
gc->SetBrush(wxBrush(s_fgColour, wxBRUSHSTYLE_SOLID));
gc->DrawRectangle(-50, -50, s_dcSize.GetWidth()+100, s_dcSize.GetHeight()+100);
// Compare filled in clipping region with reference rectangle.
// Rotated rectangles created by clipping and drawing procedures
// can be slightly different (shifted by few pixels) due
// to the different algorithms used for different operations
// so we need to perform a "fuzzy" comparison of the images,
// tolerating some drift of the pixels.
CheckClipWithBitmap(bmpRef, 1);
}