本篇内容主要讲解“c++如何使用tinyxml构建基本的SVG图形”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“c++如何使用tinyxml构建基本的SVG图形”吧!
Clion的目录
CMakelists.txt
cmake_minimum_required(VERSION 3.16)
project(untitled)
set(CMAKE_CXX_STANDARD 14)
include_directories(${CMAKE_SOURCE_DIR})
add_executable(untitled main.cpp tinystr.cpp tinyxml.cpp tinyxmlparser.cpp tinyxmlerror.cpp )代码
#include <iostream>
#include<string>
#include "tinyxml.h"
using namespace std;
void createCircleSVG(TiXmlDocument &xml_doc) {
// 添加XML声明
xml_doc.LinkEndChild(new TiXmlDeclaration("1.0", "GBK", ""));
// 添加根元素
TiXmlElement *xml_html = new TiXmlElement("html");
xml_doc.LinkEndChild(xml_html);
// 嵌套子元素
TiXmlElement *xml_body = new TiXmlElement("body");
xml_html->LinkEndChild(xml_body);
TiXmlElement *xml_h2 = new TiXmlElement("h2");
xml_h2->LinkEndChild(new TiXmlText("My first SVG"));
xml_body->LinkEndChild(xml_h2);
TiXmlElement *xml_circle = new TiXmlElement("circle");
xml_circle->SetAttribute("cx", "100");
xml_circle->SetAttribute("cy", "50");
xml_circle->SetAttribute("r", "40");
xml_circle->SetAttribute("stroke", "black");
xml_circle->SetAttribute("stroke-width", "2");
xml_circle->SetAttribute("fill", "red");
TiXmlElement *xml_svg = new TiXmlElement("svg");
xml_svg->SetAttribute("xmlns", "http://www.w3.org/2000/svg");
xml_svg->SetAttribute("version", "1.1");
xml_svg->LinkEndChild(xml_circle);
xml_body->LinkEndChild(xml_svg);
}
void createEllipseSVG(TiXmlDocument &xml_doc) {
// 添加XML声明
xml_doc.LinkEndChild(new TiXmlDeclaration("1.0", "GBK", ""));
// 添加根元素
TiXmlElement *xml_html = new TiXmlElement("html");
xml_doc.LinkEndChild(xml_html);
// 嵌套子元素
TiXmlElement *xml_body = new TiXmlElement("body");
xml_html->LinkEndChild(xml_body);
TiXmlElement *xml_h2 = new TiXmlElement("h2");
xml_h2->LinkEndChild(new TiXmlText("My first SVG"));
xml_body->LinkEndChild(xml_h2);
TiXmlElement *xml_ellipse = new TiXmlElement("ellipse");
xml_ellipse->SetAttribute("cx", "300");
xml_ellipse->SetAttribute("cy", "80");
xml_ellipse->SetAttribute("rx", "100");
xml_ellipse->SetAttribute("ry", "50");
xml_ellipse->SetAttribute("stroke", "black");
xml_ellipse->SetAttribute("stroke-width", "2");
xml_ellipse->SetAttribute("fill", "red");
TiXmlElement *xml_svg = new TiXmlElement("svg");
xml_svg->SetAttribute("xmlns", "http://www.w3.org/2000/svg");
xml_svg->SetAttribute("version", "1.1");
xml_svg->LinkEndChild(xml_ellipse);
xml_body->LinkEndChild(xml_svg);
}
void createRectSVG(TiXmlDocument &xml_doc) {
// 添加XML声明
xml_doc.LinkEndChild(new TiXmlDeclaration("1.0", "GBK", ""));
// 添加根元素
TiXmlElement *xml_html = new TiXmlElement("html");
xml_doc.LinkEndChild(xml_html);
// 嵌套子元素
TiXmlElement *xml_body = new TiXmlElement("body");
xml_html->LinkEndChild(xml_body);
TiXmlElement *xml_h2 = new TiXmlElement("h2");
xml_h2->LinkEndChild(new TiXmlText("My first SVG"));
xml_body->LinkEndChild(xml_h2);
TiXmlElement *xml_rect = new TiXmlElement("rect");
xml_rect->SetAttribute("width", "300");
xml_rect->SetAttribute("height", "100");
xml_rect->SetAttribute("stroke", "black");
xml_rect->SetAttribute("stroke-width", "2");
xml_rect->SetAttribute("fill", "green");
TiXmlElement *xml_svg = new TiXmlElement("svg");
xml_svg->SetAttribute("xmlns", "http://www.w3.org/2000/svg");
xml_svg->SetAttribute("version", "1.1");
xml_svg->LinkEndChild(xml_rect);
xml_body->LinkEndChild(xml_svg);
}
void createPolygonSVG(TiXmlDocument &xml_doc) {
// 添加XML声明
xml_doc.LinkEndChild(new TiXmlDeclaration("1.0", "GBK", ""));
// 添加根元素
TiXmlElement *xml_html = new TiXmlElement("html");
xml_doc.LinkEndChild(xml_html);
// 嵌套子元素
TiXmlElement *xml_body = new TiXmlElement("body");
xml_html->LinkEndChild(xml_body);
TiXmlElement *xml_h2 = new TiXmlElement("h2");
xml_h2->LinkEndChild(new TiXmlText("My first SVG"));
xml_body->LinkEndChild(xml_h2);
TiXmlElement *xml_polygon = new TiXmlElement("polygon");
xml_polygon->SetAttribute("points", "200,10 250,190 160,210");
xml_polygon->SetAttribute("stroke", "black");
xml_polygon->SetAttribute("stroke-width", "2");
xml_polygon->SetAttribute("fill", "red");
TiXmlElement *xml_svg = new TiXmlElement("svg");
xml_svg->SetAttribute("xmlns", "http://www.w3.org/2000/svg");
xml_svg->SetAttribute("version", "1.1");
xml_svg->LinkEndChild(xml_polygon);
xml_body->LinkEndChild(xml_svg);
}
void createLineSVG(TiXmlDocument &xml_doc) {
// 添加XML声明
xml_doc.LinkEndChild(new TiXmlDeclaration("1.0", "GBK", ""));
// 添加根元素
TiXmlElement *xml_html = new TiXmlElement("html");
xml_doc.LinkEndChild(xml_html);
// 嵌套子元素
TiXmlElement *xml_body = new TiXmlElement("body");
xml_html->LinkEndChild(xml_body);
TiXmlElement *xml_h2 = new TiXmlElement("h2");
xml_h2->LinkEndChild(new TiXmlText("My first SVG"));
xml_body->LinkEndChild(xml_h2);
TiXmlElement *xml_line = new TiXmlElement("line");
xml_line->SetAttribute("x1", "100");
xml_line->SetAttribute("y1", "100");
xml_line->SetAttribute("x2", "400");
xml_line->SetAttribute("y2", "400");
xml_line->SetAttribute("stroke", "black");
xml_line->SetAttribute("stroke-width", "2");
xml_line->SetAttribute("fill", "green");
TiXmlElement *xml_svg = new TiXmlElement("svg");
xml_svg->SetAttribute("xmlns", "http://www.w3.org/2000/svg");
xml_svg->SetAttribute("version", "1.1");
xml_svg->LinkEndChild(xml_line);
xml_body->LinkEndChild(xml_svg);
}
void parseCircleSVG(TiXmlDocument &xml_doc) {
TiXmlHandle docHandle(&xml_doc);
TiXmlElement *child = docHandle.FirstChild("html").FirstChild("body").FirstChild("svg").ToElement();
for (child; child; child = child->NextSiblingElement()) {
string xmlnsStr = child->Attribute("xmlns");
string versionStr = child->Attribute("version");
std::cout << "xmlns :" << xmlnsStr
<< " version" << versionStr << std::endl;
TiXmlElement *circleItem = child->FirstChild()->ToElement();
string cxStr = circleItem->Attribute("cx");
string cyStr = circleItem->Attribute("cy");
string rStr = circleItem->Attribute("r");
string strokeStr = circleItem->Attribute("stroke");
string stroke_widthStr = circleItem->Attribute("stroke-width");
string fillStr = circleItem->Attribute("fill");
std::cout << " cx :" << cxStr
<< " cy :" << cyStr
<< " r :" << rStr
<< " stroke :" << strokeStr
<< " stroke-width :" << stroke_widthStr
<< " fill :" << fillStr << std::endl;
}
}
void parseRectSVG(TiXmlDocument &xml_doc) {
TiXmlHandle docHandle(&xml_doc);
TiXmlElement *child = docHandle.FirstChild("html").FirstChild("body").FirstChild("svg").ToElement();
for (child; child; child = child->NextSiblingElement()) {
string xmlnsStr = child->Attribute("xmlns");
string versionStr = child->Attribute("version");
std::cout << "xmlns :" << xmlnsStr
<< " version" << versionStr << std::endl;
TiXmlElement *circleItem = child->FirstChild()->ToElement();
string widthStr = circleItem->Attribute("width");
string heightStr = circleItem->Attribute("height");
string strokeStr = circleItem->Attribute("stroke");
string stroke_widthStr = circleItem->Attribute("stroke-width");
string fillStr = circleItem->Attribute("fill");
std::cout << " width :" << widthStr
<< " height :" << heightStr
<< " stroke :" << strokeStr
<< " stroke-width :" << stroke_widthStr
<< " fill :" << fillStr << std::endl;
}
}
void parseEllipseSVG(TiXmlDocument &xml_doc) {
TiXmlHandle docHandle(&xml_doc);
TiXmlElement *child = docHandle.FirstChild("html").FirstChild("body").FirstChild("svg").ToElement();
for (child; child; child = child->NextSiblingElement()) {
string xmlnsStr = child->Attribute("xmlns");
string versionStr = child->Attribute("version");
std::cout << "xmlns :" << xmlnsStr
<< " version" << versionStr << std::endl;
TiXmlElement *circleItem = child->FirstChild()->ToElement();
string cxStr = circleItem->Attribute("cx");
string cyStr = circleItem->Attribute("cy");
string rxStr = circleItem->Attribute("rx");
string ryStr = circleItem->Attribute("ry");
string strokeStr = circleItem->Attribute("stroke");
string stroke_widthStr = circleItem->Attribute("stroke-width");
string fillStr = circleItem->Attribute("fill");
std::cout << " cx :" << cxStr
<< " cy :" << cyStr
<< " rx :" << rxStr
<< " ry :" << ryStr
<< " stroke :" << strokeStr
<< " stroke-width :" << stroke_widthStr
<< " fill :" << fillStr << std::endl;
}
}
void parsePolygonSVG(TiXmlDocument &xml_doc) {
TiXmlHandle docHandle(&xml_doc);
TiXmlElement *child = docHandle.FirstChild("html").FirstChild("body").FirstChild("svg").ToElement();
for (child; child; child = child->NextSiblingElement()) {
string xmlnsStr = child->Attribute("xmlns");
string versionStr = child->Attribute("version");
std::cout << "xmlns :" << xmlnsStr
<< " version" << versionStr << std::endl;
TiXmlElement *circleItem = child->FirstChild()->ToElement();
string pointsStr = circleItem->Attribute("points");
string strokeStr = circleItem->Attribute("stroke");
string stroke_widthStr = circleItem->Attribute("stroke-width");
string fillStr = circleItem->Attribute("fill");
std::cout << " points :" << pointsStr
<< " stroke :" << strokeStr
<< " stroke-width :" << stroke_widthStr
<< " fill :" << fillStr << std::endl;
}
}
void parseLineSVG(TiXmlDocument &xml_doc) {
TiXmlHandle docHandle(&xml_doc);
TiXmlElement *child = docHandle.FirstChild("html").FirstChild("body").FirstChild("svg").ToElement();
for (child; child; child = child->NextSiblingElement()) {
string xmlnsStr = child->Attribute("xmlns");
string versionStr = child->Attribute("version");
std::cout << "xmlns :" << xmlnsStr
<< " version" << versionStr << std::endl;
TiXmlElement *circleItem = child->FirstChild()->ToElement();
string x1Str = circleItem->Attribute("x1");
string y1Str = circleItem->Attribute("y1");
string x2Str = circleItem->Attribute("x2");
string y2Str = circleItem->Attribute("y2");
string strokeStr = circleItem->Attribute("stroke");
string stroke_widthStr = circleItem->Attribute("stroke-width");
string fillStr = circleItem->Attribute("fill");
std::cout << " x1 :" << x1Str
<< " y1 :" << y1Str
<< " x2 :" << x2Str
<< " y2 :" << y2Str
<< " stroke :" << strokeStr
<< " stroke-width :" << stroke_widthStr
<< " fill :" << fillStr << std::endl;
}
}
void constructCircle() {
TiXmlDocument xml_doc_Circle;
std::string exampleCircle = "circle.html"; // 可以改成xml后缀
createCircleSVG(xml_doc_Circle);
xml_doc_Circle.SaveFile(exampleCircle.c_str());
// if(!xml_doc.LoadFile(example.c_str()))
// {
// cerr << xml_doc.ErrorDesc() << endl;
// return -1;
// }
// 也可以读取文件 进行解析
parseCircleSVG(xml_doc_Circle);
}
void constructRect() {
TiXmlDocument xml_doc_Rect;
std::string exampleRect = "rect.html"; // 可以改成xml后缀
createRectSVG(xml_doc_Rect);
// 保存到文件
xml_doc_Rect.SaveFile(exampleRect.c_str());
parseRectSVG(xml_doc_Rect);
}
void constructEllipse() {
TiXmlDocument xml_doc_Ellipse;
std::string exampleEllipse = "Ellipse.html"; // 可以改成xml后缀
createEllipseSVG(xml_doc_Ellipse);
xml_doc_Ellipse.SaveFile(exampleEllipse.c_str());
parseEllipseSVG(xml_doc_Ellipse);
}
void constructPolygon() {
TiXmlDocument xml_doc_Polygon;
std::string examplePolygon = "Polygon.html"; // 可以改成xml后缀
createPolygonSVG(xml_doc_Polygon);
xml_doc_Polygon.SaveFile(examplePolygon.c_str());
parsePolygonSVG(xml_doc_Polygon);
}
void constructLine() {
TiXmlDocument xml_doc_Line;
std::string exampleLine = "Line.html"; // 可以改成xml后缀
createLineSVG(xml_doc_Line);
xml_doc_Line.SaveFile(exampleLine.c_str());
parseLineSVG(xml_doc_Line);
}
int main() {
constructCircle();
constructRect();
constructEllipse();
constructPolygon();
constructLine();
std::cout << "xml generate accomplished!\n";
return 0;
}测试结果
F:\untitled\cmake-build-debug\untitled.exe xmlns :http://www.w3.org/2000/svg version1.1 cx :100 cy :50 r :40 stroke :black stroke-width :2 fill :red xmlns :http://www.w3.org/2000/svg version1.1 width :300 height :100 stroke :black stroke-width :2 fill :green xmlns :http://www.w3.org/2000/svg version1.1 cx :300 cy :80 rx :100 ry :50 stroke :black stroke-width :2 fill :red xmlns :http://www.w3.org/2000/svg version1.1 points :200,10 250,190 160,210 stroke :black stroke-width :2 fill :red xmlns :http://www.w3.org/2000/svg version1.1 x1 :100 y1 :100 x2 :400 y2 :400 stroke :black stroke-width :2 fill :green xml generate accomplished! Process finished with exit code 0
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