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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkMathTextUtilities.h"
#include "vtkContext2D.h"
#include "vtkContextItem.h"
#include "vtkContextScene.h"
#include "vtkContextView.h"
#include "vtkIntArray.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkPath.h"
#include "vtkPen.h"
#include "vtkPoints.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkTextProperty.h"
//------------------------------------------------------------------------------
class StringToPathContextTest : public vtkContextItem
{
public:
static StringToPathContextTest* New();
vtkTypeMacro(StringToPathContextTest, vtkContextItem);
// Paint event for the chart, called whenever the chart needs to be drawn
bool Paint(vtkContext2D* painter) override;
void SetPath(vtkPath* path) { this->Path = path; }
protected:
vtkPath* Path;
};
//------------------------------------------------------------------------------
int TestStringToPath(int vtkNotUsed(argc), char* vtkNotUsed(argv)[])
{
// Set up a 2D context view, context test object and add it to the scene
vtkNew<vtkContextView> view;
view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
view->GetRenderWindow()->SetSize(325, 150);
vtkNew<StringToPathContextTest> test;
view->GetScene()->AddItem(test);
vtkNew<vtkPath> path;
vtkNew<vtkTextProperty> tprop;
vtkMathTextUtilities::GetInstance()->StringToPath(
"$\\frac{-b\\pm\\sqrt{b^2-4ac}}{2a}$", path, tprop, view->GetRenderWindow()->GetDPI());
test->SetPath(path);
view->GetRenderWindow()->SetMultiSamples(0);
view->GetInteractor()->Initialize();
view->GetInteractor()->Start();
return EXIT_SUCCESS;
}
// Make our new derived class to draw a diagram
vtkStandardNewMacro(StringToPathContextTest);
// This function aims to test the primitives provided by the 2D API.
bool StringToPathContextTest::Paint(vtkContext2D* painter)
{
// RGB color lookup table by path point code:
double color[4][3];
color[vtkPath::MOVE_TO][0] = 1.0;
color[vtkPath::MOVE_TO][1] = 0.0;
color[vtkPath::MOVE_TO][2] = 0.0;
color[vtkPath::LINE_TO][0] = 0.0;
color[vtkPath::LINE_TO][1] = 1.0;
color[vtkPath::LINE_TO][2] = 0.0;
color[vtkPath::CONIC_CURVE][0] = 0.0;
color[vtkPath::CONIC_CURVE][1] = 0.0;
color[vtkPath::CONIC_CURVE][2] = 1.0;
color[vtkPath::CUBIC_CURVE][0] = 1.0;
color[vtkPath::CUBIC_CURVE][1] = 0.0;
color[vtkPath::CUBIC_CURVE][2] = 1.0;
vtkPoints* points = this->Path->GetPoints();
vtkIntArray* codes = this->Path->GetCodes();
if (points->GetNumberOfPoints() != codes->GetNumberOfTuples())
{
return false;
}
// scaling factor and offset to ensure that the points will fit the view:
double scale = 5.16591;
double offset = 20.0;
// Draw the control points, colored by codes:
double point[3];
painter->GetPen()->SetWidth(2);
for (vtkIdType i = 0; i < points->GetNumberOfPoints(); ++i)
{
points->GetPoint(i, point);
int code = codes->GetValue(i);
painter->GetPen()->SetColorF(color[code]);
painter->DrawPoint(point[0] * scale + offset, point[1] * scale + offset);
}
return true;
}
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