vtk 顯示中文

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#include "vtkTextRenderer.h"
#include "vtkNew.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkStdString.h"
#include "vtkTextActor.h"
#include "vtkTextProperty.h"
#include "vtkSmartPointer.h"
#include "vtkUnicodeString.h"
#include <iostream>
#include <string>

int main(int argc, char *argv[])
{
    std::string uncodeFontFile("/usr/share/fonts/truetype/arphic/ukai.ttc");

    vtkSmartPointer<vtkTextRenderer> tren = vtkSmartPointer<vtkTextRenderer>::New();
    if (tren == nullptr)
    {
        std::cerr << "Object factory cannot find vtkTextRenderer override.\n";
        return EXIT_FAILURE;
    }

    if (strcmp(tren->GetClassName(), "vtkMathTextFreeTypeTextRenderer") != 0)
    {
        std::cerr << "Object factory returning unrecognized vtkTextRenderer "
            "override: " << tren->GetClassName() << std::endl;
        return EXIT_FAILURE;
    }

    std::string str = "Sample multiline\ntext rendered\nusing FreeTypeTools.";
    vtkSmartPointer<vtkTextActor> actor1 = vtkSmartPointer<vtkTextActor>::New();
    actor1->GetTextProperty()->SetFontSize(20);
    actor1->GetTextProperty()->SetColor(1.0, 0.0, 0.0);
    actor1->GetTextProperty()->SetJustificationToLeft();
    actor1->GetTextProperty()->SetVerticalJustificationToTop();
    actor1->GetTextProperty()->SetFontFamilyToTimes();
    actor1->SetInput(str.c_str());
    actor1->SetPosition(10, 590);

    vtkSmartPointer<vtkTextActor> actor2 = vtkSmartPointer<vtkTextActor>::New();
    actor2->GetTextProperty()->SetFontSize(20);
    actor2->GetTextProperty()->SetColor(0.0, 1.0, 0.0);
    actor2->GetTextProperty()->SetJustificationToRight();
    actor2->GetTextProperty()->SetVerticalJustificationToTop();
    actor2->GetTextProperty()->SetFontFamilyToCourier();
    actor2->SetInput(str.c_str());
    actor2->SetPosition(590, 590);

    vtkSmartPointer<vtkTextActor> actor3 = vtkSmartPointer<vtkTextActor>::New();
    actor3->GetTextProperty()->SetFontSize(20);
    actor3->GetTextProperty()->SetColor(0.0, 0.0, 1.0);
    actor3->GetTextProperty()->SetJustificationToLeft();
    actor3->GetTextProperty()->SetVerticalJustificationToBottom();
    actor3->GetTextProperty()->SetItalic(1);
    actor3->SetInput(str.c_str());
    actor3->SetPosition(10, 10);

    vtkSmartPointer<vtkTextActor> actor4 = vtkSmartPointer<vtkTextActor>::New();
    actor4->GetTextProperty()->SetFontSize(20);
    actor4->GetTextProperty()->SetColor(0.3, 0.4, 0.5);
    actor4->GetTextProperty()->SetJustificationToRight();
    actor4->GetTextProperty()->SetVerticalJustificationToBottom();
    actor4->GetTextProperty()->SetBold(1);
    actor4->GetTextProperty()->SetShadow(1);
    actor4->GetTextProperty()->SetShadowOffset(-3, 2);
    actor4->SetInput(str.c_str());
    actor4->SetPosition(590, 10);

    vtkSmartPointer<vtkTextActor> actor5 = vtkSmartPointer<vtkTextActor>::New();
    actor5->GetTextProperty()->SetFontSize(20);
    actor5->GetTextProperty()->SetColor(1.0, 1.0, 0.0);
    actor5->GetTextProperty()->SetJustificationToCentered();
    actor5->GetTextProperty()->SetVerticalJustificationToCentered();
    actor5->GetTextProperty()->SetBold(1);
    actor5->GetTextProperty()->SetItalic(1);
    actor5->GetTextProperty()->SetShadow(1);
    actor5->GetTextProperty()->SetShadowOffset(5, -8);
    actor5->SetInput(str.c_str());
    actor5->SetPosition(300, 300);

    vtkSmartPointer<vtkTextActor> actor6 = vtkSmartPointer<vtkTextActor>::New();
    actor6->GetTextProperty()->SetFontSize(16);
    actor6->GetTextProperty()->SetColor(1.0, 0.5, 0.2);
    actor6->GetTextProperty()->SetJustificationToCentered();
    actor6->GetTextProperty()->SetVerticalJustificationToCentered();
    actor6->GetTextProperty()->SetOrientation(45);
    actor6->SetInput(str.c_str());
    actor6->SetPosition(300, 450);

    vtkSmartPointer<vtkTextActor> actor7 = vtkSmartPointer<vtkTextActor>::New();
    actor7->GetTextProperty()->SetFontSize(16);
    actor7->GetTextProperty()->SetColor(0.5, 0.2, 1.0);
    actor7->GetTextProperty()->SetJustificationToLeft();
    actor7->GetTextProperty()->SetVerticalJustificationToCentered();
    actor7->GetTextProperty()->SetOrientation(45);
    actor7->SetInput(str.c_str());
    actor7->SetPosition(100, 156);

    vtkSmartPointer<vtkTextActor> actor8 = vtkSmartPointer<vtkTextActor>::New();
    actor8->GetTextProperty()->SetFontSize(16);
    actor8->GetTextProperty()->SetColor(0.8, 1.0, 0.3);
    actor8->GetTextProperty()->SetJustificationToRight();
    actor8->GetTextProperty()->SetVerticalJustificationToCentered();
    actor8->GetTextProperty()->SetOrientation(45);
    actor8->SetInput(str.c_str());
    actor8->SetPosition(500, 249);

    // Mathtext tests

    // Test that escaped "$" are passed through to freetype:
    vtkSmartPointer<vtkTextActor> actor9 = vtkSmartPointer<vtkTextActor>::New();
    actor9->GetTextProperty()->SetFontSize(12);
    actor9->GetTextProperty()->SetColor(0.2, 0.5, 1.0);
    actor9->SetInput("Escaped dollar signs:\n\\$10, \\$20");
    actor9->SetPosition(100, 450);

    vtkSmartPointer<vtkTextActor> actor10 = vtkSmartPointer<vtkTextActor>::New();
    actor10->GetTextProperty()->SetFontSize(16);
    actor10->GetTextProperty()->SetColor(0.5, 0.2, 1.0);
    actor10->GetTextProperty()->SetJustificationToRight();
    actor10->GetTextProperty()->SetOrientation(45);
    actor10->SetInput("Test MathText $\\int_0^\\infty\\frac{2\\pi}"
        "{x - \\frac{z}{4}}\\,dx$");
    actor10->SetPosition(588, 433);

    // Invalid latex markup -- should fallback to freetype.
    vtkSmartPointer<vtkTextActor> actor11 = vtkSmartPointer<vtkTextActor>::New();
    actor11->GetTextProperty()->SetFontSize(15);
    actor11->GetTextProperty()->SetColor(1.0, 0.5, 0.2);
    actor11->SetInput("Test FreeType fallback:\n$\\asdf$");
    actor11->SetPosition(10, 350);

    // Both $...$ and \\$
    vtkSmartPointer<vtkTextActor> actor12 = vtkSmartPointer<vtkTextActor>::New();
    actor12->GetTextProperty()->SetFontSize(18);
    actor12->GetTextProperty()->SetColor(0.0, 1.0, 0.7);
    actor12->SetInput("Test MathText '\\$' $\\$\\sqrt[3]{8}$");
    actor12->SetPosition(10, 300);

    // $...$ without other text.
    vtkSmartPointer<vtkTextActor> actor13 = vtkSmartPointer<vtkTextActor>::New();
    actor13->GetTextProperty()->SetFontSize(18);
    actor13->GetTextProperty()->SetColor(0.2, 1.0, 1.0);
    actor13->SetInput("$A = \\pi r^2$");
    actor13->SetPosition(10, 250);

    // Numbers, using courier, Text that gets 'cut off'
    vtkSmartPointer<vtkTextActor> actor14 = vtkSmartPointer<vtkTextActor>::New();
    actor14->GetTextProperty()->SetFontSize(21);
    actor14->GetTextProperty()->SetColor(1.0, 0.0, 0.0);
    actor14->GetTextProperty()->SetJustificationToCentered();
    actor14->GetTextProperty()->SetVerticalJustificationToCentered();
    actor14->GetTextProperty()->SetBold(1);
    actor14->GetTextProperty()->SetItalic(1);
    actor14->GetTextProperty()->SetFontFamilyToCourier();
    actor14->SetInput("4.0");
    actor14->SetPosition(500, 400);

    // UTF-8 freetype handling:
    vtkSmartPointer<vtkTextActor> actor15 = vtkSmartPointer<vtkTextActor>::New();
    actor15->GetTextProperty()->SetFontFamily(VTK_FONT_FILE);
    actor15->GetTextProperty()->SetFontFile(uncodeFontFile.c_str());
    actor15->GetTextProperty()->SetJustificationToCentered();
    actor15->GetTextProperty()->SetVerticalJustificationToCentered();
    actor15->GetTextProperty()->SetFontSize(18);
    actor15->GetTextProperty()->SetColor(0.0, 1.0, 0.7);
    actor15->SetInput(u8"UTF-8 FreeType: 顯示中文\n換行顯示°");
    actor15->SetPosition(300, 110);

    // Boring rendering setup....

    vtkSmartPointer<vtkRenderer> ren = vtkSmartPointer<vtkRenderer>::New();
    ren->SetBackground(0.1, 0.1, 0.1);
    vtkSmartPointer<vtkRenderWindow> win = vtkSmartPointer<vtkRenderWindow>::New();
    win->SetSize(600, 600);
    win->AddRenderer(ren);
    vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    iren->SetRenderWindow(win);

    ren->AddActor(actor1);
    ren->AddActor(actor2);
    ren->AddActor(actor3);
    ren->AddActor(actor4);
    ren->AddActor(actor5);
    ren->AddActor(actor6);
    ren->AddActor(actor7);
    ren->AddActor(actor8);
    ren->AddActor(actor9);
    ren->AddActor(actor10);
    ren->AddActor(actor11);
    ren->AddActor(actor12);
    ren->AddActor(actor13);
    ren->AddActor(actor14);
    ren->AddActor(actor15);

    win->SetMultiSamples(0);
    win->Render();
    win->GetInteractor()->Initialize();

    iren->Start();
}