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Add demonstration of affine transformations to drawing sample

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This adds a demonstration of drawing with affine 2D transformation applied
to wxDC. Transformation paramaters (translation, scale, rotation angle)
can be set/reset with new menu "Transformation".
This commit is contained in:
Artur Wieczorek
2019-12-27 20:17:19 +01:00
parent a7f31db8cd
commit bb9c8b11de
1 changed files with 145 additions and 0 deletions
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145
samples/drawing/drawing.cpp
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@@ -286,6 +286,13 @@ public:
int m_yLogicalOrigin;
bool m_xAxisReversed,
m_yAxisReversed;
#if wxUSE_DC_TRANSFORM_MATRIX
wxDouble m_transform_dx;
wxDouble m_transform_dy;
wxDouble m_transform_scx;
wxDouble m_transform_scy;
wxDouble m_transform_rot;
#endif // wxUSE_DC_TRANSFORM_MATRIX
wxColour m_colourForeground, // these are _text_ colours
m_colourBackground;
wxBrush m_backgroundBrush;
@@ -377,6 +384,11 @@ enum
LogicalOrigin_Set,
LogicalOrigin_Restore,
#if wxUSE_DC_TRANSFORM_MATRIX
TransformMatrix_Set,
TransformMatrix_Reset,
#endif // wxUSE_DC_TRANSFORM_MATRIX
#if wxUSE_COLOURDLG
Colour_TextForeground,
Colour_TextBackground,
@@ -2119,6 +2131,91 @@ void MyCanvas::UseGraphicRenderer(wxGraphicsRenderer* renderer)
}
#endif // wxUSE_GRAPHICS_CONTEXT
#if wxUSE_DC_TRANSFORM_MATRIX
#include <wx/valnum.h>
class TransformDataDialog : public wxDialog
{
public:
TransformDataDialog(wxWindow* parent, wxDouble dx, wxDouble dy, wxDouble scx, wxDouble scy, wxDouble rotAngle)
: wxDialog(parent, wxID_ANY, "Affine transformation parameters")
, m_dx(dx)
, m_dy(dy)
, m_scx(scx)
, m_scy(scy)
, m_rotAngle(rotAngle)
{
wxBoxSizer* sizer = new wxBoxSizer(wxVERTICAL);
const int border = wxSizerFlags::GetDefaultBorder();
wxFlexGridSizer* paramSizer = new wxFlexGridSizer(2, wxSize(border, border));
paramSizer->Add(new wxStaticText(this, wxID_ANY, "Translation X:"), wxSizerFlags().CentreVertical());
wxFloatingPointValidator<wxDouble> val_dx(1, &m_dx, wxNUM_VAL_NO_TRAILING_ZEROES);
paramSizer->Add(new wxTextCtrl(this, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, 0, val_dx), wxSizerFlags().CentreVertical());
paramSizer->Add(new wxStaticText(this, wxID_ANY, "Translation Y:"), wxSizerFlags().CentreVertical());
wxFloatingPointValidator<wxDouble> val_dy(1, &m_dy, wxNUM_VAL_NO_TRAILING_ZEROES);
paramSizer->Add(new wxTextCtrl(this, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, 0, val_dy), wxSizerFlags().CentreVertical());
paramSizer->Add(new wxStaticText(this, wxID_ANY, "Scale X (0.2 - 5):"), wxSizerFlags().CentreVertical());
wxFloatingPointValidator<wxDouble> val_scx(2, &m_scx, wxNUM_VAL_NO_TRAILING_ZEROES);
paramSizer->Add(new wxTextCtrl(this, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, 0, val_scx), wxSizerFlags().CentreVertical());
paramSizer->Add(new wxStaticText(this, wxID_ANY, "Scale Y (0.2 - 5):"), wxSizerFlags().CentreVertical());
wxFloatingPointValidator<wxDouble> val_scy(2, &m_scy, wxNUM_VAL_NO_TRAILING_ZEROES);
paramSizer->Add(new wxTextCtrl(this, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, 0, val_scy), wxSizerFlags().CentreVertical());
paramSizer->Add(new wxStaticText(this, wxID_ANY, "Rotation angle (deg):"), wxSizerFlags().CentreVertical());
wxFloatingPointValidator<wxDouble> val_rot(1, &m_rotAngle, wxNUM_VAL_NO_TRAILING_ZEROES);
paramSizer->Add(new wxTextCtrl(this, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, 0, val_rot), wxSizerFlags().CentreVertical());
sizer->Add(paramSizer, wxSizerFlags().DoubleBorder());
wxSizer *btnSizer = CreateSeparatedButtonSizer(wxOK | wxCANCEL);
sizer->Add(btnSizer, wxSizerFlags().Expand().Border());
SetSizerAndFit(sizer);
}
virtual bool TransferDataFromWindow() wxOVERRIDE
{
if ( !wxDialog::TransferDataFromWindow() )
return false;
if ( m_scx < 0.2 || m_scx > 5.0 || m_scy < 0.2 || m_scy > 5.0 )
{
if ( !wxValidator::IsSilent() )
wxBell();
return false;
}
return true;
}
void GetTransformationData(wxDouble* dx, wxDouble* dy, wxDouble* scx, wxDouble* scy, wxDouble* rotAngle) const
{
if ( dx )
*dx = m_dx;
if ( dy )
*dy = m_dy;
if ( scx )
*scx = m_scx;
if ( scy )
*scy = m_scy;
if ( rotAngle )
*rotAngle = m_rotAngle;
}
private:
wxDouble m_dx;
wxDouble m_dy;
wxDouble m_scx;
wxDouble m_scy;
wxDouble m_rotAngle;
};
#endif // wxUSE_DC_TRANSFORM_MATRIX
// ----------------------------------------------------------------------------
// MyFrame
// ----------------------------------------------------------------------------
@@ -2258,6 +2355,13 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
menuLogical->Append( LogicalOrigin_Set, "Set to (&100, 100)\tShift-Ctrl-1" );
menuLogical->Append( LogicalOrigin_Restore, "&Restore to normal\tShift-Ctrl-0" );
#if wxUSE_DC_TRANSFORM_MATRIX
wxMenu *menuTransformMatrix = new wxMenu;
menuTransformMatrix->Append(TransformMatrix_Set, "Set &transformation matrix");
menuTransformMatrix->AppendSeparator();
menuTransformMatrix->Append(TransformMatrix_Reset, "Restore to &normal");
#endif // wxUSE_DC_TRANSFORM_MATRIX
wxMenu *menuColour = new wxMenu;
#if wxUSE_COLOURDLG
menuColour->Append( Colour_TextForeground, "Text &foreground..." );
@@ -2275,6 +2379,9 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
menuBar->Append(menuUserScale, "&Scale");
menuBar->Append(menuAxis, "&Axis");
menuBar->Append(menuLogical, "&Origin");
#if wxUSE_DC_TRANSFORM_MATRIX
menuBar->Append(menuTransformMatrix, "&Transformation");
#endif // wxUSE_DC_TRANSFORM_MATRIX
menuBar->Append(menuColour, "&Colours");
// ... and attach this menu bar to the frame
@@ -2292,6 +2399,13 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
m_yLogicalOrigin = 0;
m_xAxisReversed =
m_yAxisReversed = false;
#if wxUSE_DC_TRANSFORM_MATRIX
m_transform_dx = 0.0;
m_transform_dy = 0.0;
m_transform_scx = 1.0;
m_transform_scy = 1.0;
m_transform_rot = 0.0;
#endif // wxUSE_DC_TRANSFORM_MATRIX
m_backgroundMode = wxBRUSHSTYLE_SOLID;
m_colourForeground = *wxBLACK;
m_colourBackground = *wxLIGHT_GREY;
@@ -2539,6 +2653,27 @@ void MyFrame::OnOption(wxCommandEvent& event)
m_xAxisReversed = !m_xAxisReversed;
break;
#if wxUSE_DC_TRANSFORM_MATRIX
case TransformMatrix_Set:
{
TransformDataDialog dlg(this, m_transform_dx, m_transform_dy,
m_transform_scx, m_transform_scy, m_transform_rot);
if ( dlg.ShowModal() == wxID_OK )
{
dlg.GetTransformationData(&m_transform_dx, &m_transform_dy,
&m_transform_scx, &m_transform_scy, &m_transform_rot);
}
}
break;
case TransformMatrix_Reset:
m_transform_dx = 0.0;
m_transform_dy = 0.0;
m_transform_scx = 1.0;
m_transform_scy = 1.0;
m_transform_rot = 0.0;
break;
#endif // wxUSE_DC_TRANSFORM_MATRIX
#if wxUSE_COLOURDLG
case Colour_TextForeground:
m_colourForeground = SelectColour();
@@ -2591,6 +2726,16 @@ void MyFrame::OnBoundingBoxUpdateUI(wxUpdateUIEvent& evt)
void MyFrame::PrepareDC(wxDC& dc)
{
#if wxUSE_DC_TRANSFORM_MATRIX
if ( dc.CanUseTransformMatrix() )
{
wxAffineMatrix2D mtx;
mtx.Translate(m_transform_dx, m_transform_dy);
mtx.Rotate(wxDegToRad(m_transform_rot));
mtx.Scale(m_transform_scx, m_transform_scy);
dc.SetTransformMatrix(mtx);
}
#endif // wxUSE_DC_TRANSFORM_MATRIX
dc.SetLogicalOrigin( m_xLogicalOrigin, m_yLogicalOrigin );
dc.SetAxisOrientation( !m_xAxisReversed, m_yAxisReversed );
dc.SetUserScale( m_xUserScale, m_yUserScale );