VTK显示中文

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最新推荐文章于 2025-06-16 10:59:34 发布

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文章标签： VTK中文显示 VTK文本显示 vtkTextRenderer vtkTextActor vtkTextProperty

本文链接：https://blog.youkuaiyun.com/webzhuce/article/details/89768957

博客介绍了VTK中文显示相关内容。vtk 5.x版本显示中文困难，需修改底层代码，而从vtk 6.1开始，中文支持问题不大，关键是文字用utf - 8格式，对vtkTextProperty指定中文字体文件，还给出示例代码重点演示中文显示。

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基本概念

vtk 5.x版本显示中文是一个比较困难的问题，基本上需要修改底层代码。从vtk 6.1开始，其实中文支持已经不是大问题了。VTK开始支持使用指定的ttf字体文件进行显示了。关键是两个问题：文字使用utf-8格式，比如textActor.SetInput()；对vtkTextProperty直接指定使用中文字体文件，比如，simhei.ttf 。例如

vtkNew<vtkTextProperty> tprop;
tprop->SetFontFamily(VTK_FONT_FILE); 
tprop->SetFontFile(“/path/to/some/font/file.ttf”);

示例演示

我们绘制不同要求的文字，重点演示如何显示中文。代码如下。

/**********************************************************************

Copyright (c) Mr.Bin. All rights reserved.
For more information visit: http://blog.youkuaiyun.com/webzhuce

**********************************************************************/
#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 <windows.h>
#include <iostream>
#include <string>

int main(int argc, char *argv[])
{
	if (argc < 2)
	{
		cerr << "Missing font filename." << endl;
		return EXIT_FAILURE;
	}

	std::string uncodeFontFile(argv[1]);

	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: 显示中文\n换行显示");
	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();
	win->GetInteractor()->Start();

	return EXIT_SUCCESS;
}

运行结果

在这里插入图片描述

参考资料

无