qwt安装使用精华版

qwt安装使用精华版

今天在使用Qwt时候遇到了一些问题,在大大小小的问题中折腾了大概一天，先记录下来并反思解决问题的方法。
先是按照和下方相似的流程进行dll编译时（从stackoverflow上检索到）：
1. Download and install QT 5.0.2 (MinGw) to: "C:\Qt\Qt5.0.2"
2. Download and extract Qwt 6.1 to:"C:\qwt-6.1.0"
3. Add "C:\Qt\Qt5.0.2\5.0.2\mingw47_32\bin" to your systems pathvariable (qmake.exe is located here)
4. Add "C:\Qt\Qt5.0.2\Tools\MinGW\bin" to your systems pathvariable (mingw32-make.exe is located here)
5. Open a command line (cmd) and navigate to: "C:\qwt-6.1.0"
6. Type: "qmake" (This command won't prompt any msg so don'tworry)
7. Type: "mingw32-make" (Compiles the whole project withexamples; this will take a while so be patient)

出现了类似如下的问题：
And it failed during the make process with the following errors:
linking ../lib/qwt.dll
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -lQt5OpenGL
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -lQt5Svg
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -lQt5PrintSupport
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -lQt5Widgets
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -lQt5Concurrent
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -lQt5Gui
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -lQt5Core
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -llibEGL
c:/qt/qt5.0.2/tools/mingw/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686
-w64-mingw32/bin/ld.exe: cannot find -llibGLESv2
collect2.exe: error: ld returned 1 exit status
Makefile.Release:320:recipe for target '../lib/qwt.dll' failed



原因是因为忽略了3和4步骤，也就是忘记将相应部分加入到系统变量中（加入到用户变量中也可）。并上述问题全是在linking时候出的问题（注意路径、lib、dll等）



后来按照如下HOWTO教程配置：（HowTo:
Installation of Qt 5.0.1 andQwt 6.1.0 rc3 (Win7 64bit)）（来源于网络，忘记是哪个了）

Hello everyone,

i was trying to get Qwt running properly on my Windows7 64bit PC. After hoursof trying to find the right way to do this i wrote a step by step install andtest manual.

I would appreciate a comment of Uwe if this is the right way to do it,especially on the systems path and user variables.

@Uwe: I also hope this guide saves you some time explaining people how toinstall qwt.

Lets start:

1. Download and install QT 5.0.1 (MinGw) to: "C:\Qt\Qt5.0.1"

2. Download and extract Qwt 6.1 RC3 to: "C:\qwt-6.1-rc3"

3. Add "C:\Qt\Qt5.0.1\5.0.1\mingw47_32\bin" to your systems pathvariable (qmake.exe is located here)

4. Add "C:\Qt\Qt5.0.1\Tools\MinGW\bin" to your systems path variable(mingw32-make.exe is located here)

5. Open a command line (cmd) and navigate to: "C:\qwt-6.1-rc3"

6. Type: "qmake" (This command won't prompt any msg so don't worry)

7. Type: "mingw32-make" (Compiles the whole project with examples;this will take a while so be patient)

8. Type: "mingw32-make install" (This installs qwt to the directoryset in "C:\qwt-6.1-rc3\qwtconfig.pri"; the default location is"C:/Qwt-$$QWT_VERSION-rc3" -> "C:\Qwt-6.1.0-rc3\")

9. Add "C:\Qwt-6.1.0-rc3\lib" to your systems path variable

10. Add a User variable named "QT_PLUGIN_PATH" with the followingpath "C:\Qwt-6.1.0-rc3\plugins"

11. Add a User variable named "QMAKEFEATURES" with the following path"C:\Qwt-6.1.0-rc3\features"

12. Start Qt Creator

13. Create a new project: File -> New File or Project ... -> Applications-> Qt Gui Application -> Choose

14. Name it "Test"

15. Create the project in the following directory: "C:\workspace"

16. Open file "Test.pro"

17. Add "Config += qwt" at the bottom

18. Open the main.c of the project and delete all its content.

19. Paste the following in the main.c (This is the qwt example"simpleplot"):

1. #include <qapplication.h>
2. #include <qwt_plot.h>
3. #include <qwt_plot_curve.h>
4. #include <qwt_plot_grid.h>
5. #include <qwt_symbol.h>
6. #include <qwt_legend.h>
7.  
8. int main(int argc,char**argv )
9. {
10.      QApplication a( argc, argv);
11.   
12.      QwtPlot plot;
13.      plot.setTitle("Plot Demo");
14.      plot.setCanvasBackground( Qt::white);
15.      plot.setAxisScale(QwtPlot::yLeft,0.0, 10.0);
16.      plot.insertLegend(newQwtLegend());
17.   
18.      QwtPlotGrid*grid=newQwtPlotGrid();
19.      grid->attach(&plot);
20.   
21.      QwtPlotCurve*curve=newQwtPlotCurve();
22.      curve->setTitle("SomePoints");
23.      curve->setPen( Qt::blue,4),
24.      curve->setRenderHint(QwtPlotItem::RenderAntialiased,true);
25.   
26.      QwtSymbol*symbol=newQwtSymbol(QwtSymbol::Ellipse,
27.          QBrush( Qt::yellow),QPen( Qt::red,2), QSize(8,8));
28.      curve->setSymbol( symbol);
29.   
30.      QPolygonF points;
31.      points << QPointF(0.0,4.4) << QPointF(1.0,3.0)
32.          << QPointF(2.0,4.5) << QPointF(3.0,6.8)
33.          << QPointF(4.0,7.9) << QPointF(5.0,7.1);
34.      curve->setSamples( points);
35.   
36.      curve->attach(&plot);
37.   
38.      plot.resize(600,400);
39.      plot.show();
40.   
41.      return a.exec();
42.  }

20. Rightclick the project and select "run qmake..."

21. Now run the project. It should compile without errors and run.

Remember this:

For your own projects you now only have to add "Config += qwt" toyour *.pro file to get Qwt running.

I hope this tutorial helps to do your first steps with QT + Qwt.



可是不知道是不是系统是XP的原因，最终失败。



最后还是中规中矩按照网上的大部分人的方法：

先说完整的解决方案:（这里我用的是qt5.1.1不是SDK版本，自己找到相对应的路径即可（都是在C:\Qt\Qt5.1.1\5.1.1\mingw48_32路径下动作））

1.网上下载:http://sourceforge.net/projects/qwt/files/qwt/6.0.1/我下的是6.0.1,把相关的几个都下下来了.

2.解压qwt-6.0.1.zip,用QtCreator打开qwt.pro(注意不是用vs,可以同时安装QtSDK以及Qt4.8.1库,QtVisual
Studio Add-in),取消使用影子构建;

3.构建qwt,构建完成后在qwt-6.0.1\lib目录中会生成若干lib文件和dll文件,复制lib文件到C:\Qt\4.8.1\lib中;复制dll文件到C:\Qt\4.8.1\bin目录中.

4.在qwt-6.0.1\designer\plugins\designer中会生成qwt_designer_plugin.dll以及qwt_designer_plugin.lib,把这两个文件复制到C:\Qt\4.8.1\plugins\designer目录中.

5.搜索qwt-6.0.1\src目录下的所有*.h文件,把所有的头文件复制到C:\Qt\4.8.1\include目录下即可.再打开QtDesigner就可以看到对应的控件了.（可新建Qwt文件夹便于管理，也只有这步骤之后才能在designer中看见qwt的控件）。

接下来，使用如下例子验证：

qwt.pro中添加（与你路径相对应）
INCLUDEPATH+=C:/Qt/Qt5.1.1/5.1.1/mingw48_32/include/Qwt
LIBS+=-LC:/Qt/Qt5.1.1/5.1.1/mingw48_32/lib–lqwtd（release的话用qwt即可）

Plot.h
#ifndef PLOT_H
#define PLOT_H
#include < qapplication.h>
#include <QtGui>
#include < qwt_plot.h>
#include <qwt_plot_curve.h>
#include < qwt_legend.h>

class Plot : public QwtPlot
{
public:
Plot();

};
#endif PLOT_H
 
Plot.cpp
#include"plot.h"
Plot::Plot()
{
setTitle("A Simple QwtPlot Demonstration");//设置标题
insertLegend(new QwtLegend(), QwtPlot::RightLegend);//设置标线的栏
setAxisTitle(xBottom, "x -->");
setAxisScale(xBottom, 0.0, 10.0);
setAxisTitle(yLeft, "y -->");
setAxisScale(yLeft, 0, 10.0);
QwtPlotCurve *curve = new QwtPlotCurve("line1");//实例化一条曲线
curve->attach(this);
double *x=new double[5];
double *y=new double[5];
for(int i=0;i<5;i++)
{
x[i]=i;
y[i]=i+3;
}
curve->setSamples (x,y,5);//传画曲线的数据
curve->setPen(QPen(Qt::red));
QwtPlotCurve *curve2 = new QwtPlotCurve("line2");//实例化另一条线
curve2->attach(this);
double *x2=new double[5];
double *y2=new double[5];
for(int i=0;i<5;i++)
{
x2[i]=i*3;
y2[i]=i+3;
}
curve2->setSamples (x2,y2,5);
curve2->setPen(QPen(Qt::green));
}
 
main.cpp
#include<QtGui>
#include "plot.h"

int main(int argc,char *argv[])
{
QApplication *app;
app=new QApplication(argc,argv);
Plot winmain;
winmain.show();
return app->exec();
}

这样就可以了。

--------------------------------------------14.3.30------------------------------------------------------

反思：这个库应该有相应的README或install相关文件啊，应该首先从这个下手啊，这时候出问题在从网络上找答案。