目须要依据实时数据绘制出图表,因此我们找到了qwt库。这个库是一个绘制图表,曲线图,柱状图的统计图标。
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。。
以下我们就具体解说一下这个库在Larm上的编译和移植
qwt介绍
它为具有技术专业背景的程序提供GUI组件和一组有用类。其目标是以基于2D方式的窗口部件来显示数据。 数据源以数值,数组或一组浮点数等方式提供, 输出方式能够是Curves(曲线),Slider(滚动栏),Dials(圆盘)。Compasses(仪表盘)等等。
该工具库基于Qt开发,所以也继承了Qt的跨平台特性。
qwt下载
文档 http://cznic.dl.sourceforge.net/project/qwt/qwt/6.1.0/qwt-6.1.0.pdf
编译安装
。
################################################################
# Qwt Widget Library
# Copyright (C) 1997 Josef Wilgen
# Copyright (C) 2002 Uwe Rathmann
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the Qwt License, Version 1.0
################################################################
#
# 这个是qwt的版本号号
# qwt6.1.0
QWT_VER_MAJ = 6
QWT_VER_MIN = 1
QWT_VER_PAT = 0
QWT_VERSION = $${QWT_VER_MAJ}.$${QWT_VER_MIN}.$${QWT_VER_PAT} ######################################################################
# Install paths
###################################################################### # 这个是安装的配置,比方安装路径等
# 从这里我们能够看到,
# qwt默认安装到/usr/local下。
# 默认建立一下几个主要文件夹doc, include, lib
# 次要主文件夹/plugins/designer, /features
#
#
QWT_INSTALL_PREFIX = $$[QT_INSTALL_PREFIX] unix {
QWT_INSTALL_PREFIX = /usr/local/qwt-$$QWT_VERSION
} win32 {
QWT_INSTALL_PREFIX = C:/Qwt-$$QWT_VERSION
} QWT_INSTALL_DOCS = $${QWT_INSTALL_PREFIX}/doc
QWT_INSTALL_HEADERS = $${QWT_INSTALL_PREFIX}/include
QWT_INSTALL_LIBS = $${QWT_INSTALL_PREFIX}/lib ######################################################################
# Designer plugin
# creator/designer load designer plugins from certain default
# directories ( f.e the path below QT_INSTALL_PREFIX ) and the
# directories listed in the QT_PLUGIN_PATH environment variable.
# When using the path below QWT_INSTALL_PREFIX you need to
# add $${QWT_INSTALL_PREFIX}/plugins to QT_PLUGIN_PATH in the
# runtime environment of designer/creator.
###################################################################### QWT_INSTALL_PLUGINS = $${QWT_INSTALL_PREFIX}/plugins/designer # linux distributors often organize the Qt installation
# their way and QT_INSTALL_PREFIX doesn't offer a good
# path. Also QT_INSTALL_PREFIX is only one of the default
# search paths of the designer - not the Qt creator #QWT_INSTALL_PLUGINS = $$[QT_INSTALL_PREFIX]/plugins/designer ######################################################################
# Features
# When building a Qwt application with qmake you might want to load
# the compiler/linker flags, that are required to build a Qwt application
# from qwt.prf. Therefore all you need to do is to add "CONFIG += qwt"
# to your project file and take care, that qwt.prf can be found by qmake.
# ( see http://doc.trolltech.com/4.7/qmake-advanced-usage.html#adding-new-configuration-features )
# I recommend not to install the Qwt features together with the
# Qt features, because you will have to reinstall the Qwt features,
# with every Qt upgrade.
###################################################################### QWT_INSTALL_FEATURES = $${QWT_INSTALL_PREFIX}/features
# QWT_INSTALL_FEATURES = $$[QT_INSTALL_PREFIX]/features #
#
#
# 以下这些选项非常重要了, 由于您的qt假设是自编译的,
# 那么非常多第三方库,或者支持库是没有被编译的
# 并且尤其在arm上我们编译qwt时候, 编译那么多无用的支持是无用的
# QWT_CONFIG能够为动态的增减我们须要的库支持
#
######################################################################
# Build the static/shared libraries.
# If QwtDll is enabled, a shared library is built, otherwise
# it will be a static library.
######################################################################
# 选择是编译成静态库还是动态库
QWT_CONFIG += QwtDll ######################################################################
# QwtPlot enables all classes, that are needed to use the QwtPlot
# widget.
###################################################################### QWT_CONFIG += QwtPlot ######################################################################
# QwtWidgets enables all classes, that are needed to use the all other
# widgets (sliders, dials, ...), beside QwtPlot.
###################################################################### QWT_CONFIG += QwtWidgets ######################################################################
# If you want to display svg images on the plot canvas, or
# export a plot to a SVG document
######################################################################
#
QWT_CONFIG += QwtSvg ######################################################################
# If you want to use a OpenGL plot canvas
######################################################################
# 是否支持QwtOpenGL, 依赖于QtOpenGL库
# 不必选,
# 假设您不须要QwtOpenGL支持, 能够凝视
# 假设Qt库中没编译QtOpenGL, 必须凝视, 否则编译出错, 由于找不到依赖的QtOpenGL库
# 提示的错误相似与。找不到qgl.h等有文件
QWT_CONFIG += QwtOpenGL ######################################################################
# You can use the MathML renderer of the Qt solutions package to
# enable MathML support in Qwt. Because of license implications
# the ( modified ) code of the MML Widget solution is included and
# linked together with the QwtMathMLTextEngine into an own library.
# To use it you will have to add "CONFIG += qwtmathml"
# to your qmake project file.
######################################################################
# 是否支持QwtMathMl, 是Qwt统计数据的数学库支持
#
#
#QWT_CONFIG += QwtMathML ######################################################################
# If you want to build the Qwt designer plugin,
# enable the line below.
# Otherwise you have to build it from the designer directory.
######################################################################
# 是否支持QwtDesigner,
#
QWT_CONFIG += QwtDesigner ######################################################################
# Compile all Qwt classes into the designer plugin instead
# of linking it against the shared Qwt library. Has no effect
# when QwtDesigner or QwtDll are not both enabled.
#
# On systems where rpath is supported ( all Unixoids ) the
# location of the installed Qwt library is compiled into the plugin,
# but on Windows it might be easier to have a self contained
# plugin to avoid any hassle with configuring the runtime
# environment of the designer/creator.
###################################################################### win32 {
QWT_CONFIG += QwtDesignerSelfContained
} ######################################################################
# If you want to auto build the examples, enable the line below
# Otherwise you have to build them from the examples directory.
######################################################################
# 是否编译演示样例程序
# qwt默认不编译演示样例程序,
# 假设您想编译演示样例, 请取消凝视
#QWT_CONFIG += QwtExamples ######################################################################
# The playground is primarily intended for the Qwt development
# to explore and test new features. Nevertheless you might find
# ideas or code snippets that help for application development
# If you want to auto build the applications in playground, enable
# the line below.
# Otherwise you have to build them from the playground directory.
###################################################################### #QWT_CONFIG += QwtPlayground ######################################################################
# When Qt has been built as framework qmake wants
# to link frameworks instead of regular libs
###################################################################### macx:!static:CONFIG(qt_framework, qt_framework|qt_no_framework) { QWT_CONFIG += QwtFramework
}
好了,理解了编译的流程,我们就能够编译了。我们编译依据qt的版本号(x11, x86, arm)。分别编译出不同版本号的qwt
建立编译文件夹
tar -jxvf qwt-6.1.0-tar.gz
cp -rf qwt-6.1.0 qwt-6.1.0-x11
cp -rf qwt-6.1.0 qwt-6.1.0-x86
cp -rf qwt-6.1.0 qwt-6.1.0-arm
编译X11下的qwt库
unix {
QWT_INSTALL_PREFIX = /usr/local/qwt-$$QWT_VERSION
}
安装文件夹。改动/usr/local为qt-4.8.5-x11的文件夹/opt/qt-4.8.5-x11/
unix {
QWT_INSTALL_PREFIX = /opt/qt-4.8.5-x11/qwt-$$QWT_VERSION
}
其它信息事实上不是必需改动,因此我们前面编译qt-x11时候。QtOpenGL等库也编译了,所以不是必需改动
cd qwt-6.1.0-x11
qmake-x11
make
sudo make install
编译x86下的qwt库
首先改动配置文件。方法相似上面,
安装路径改动为/opt/qt-4.8.5-x86/,编译演示样例程序“QWT_CONFIG += QwtExamples”
注意:须要将QWT_CONFIG += QwtOpenGL,此选项须要凝视,由于我们没编译x86的QtOpenGL,
想要知道自己的qt版本号装没装这些库支持。仅仅须要去安扎un个文件夹下的include下查看有没有这些文件夹就能够了
cd qwt-6.1.0-x86
qmake-x86
make
sudo make install
编译arm下的qwt库
首先改动配置文件。方法相似上面。
安装路径改动为/opt/qt-4.8.5-arm/,编译演示样例程序“QWT_CONFIG += QwtExamples”
注意:须要将QWT_CONFIG += QwtOpenGL。此选项须要凝视,由于我们没编译arm的QtOpenGL,
cd qwt-6.1.0-arm
qmake-arm
make
sudo make install
这样我们qwt的三个不同版本号就编译好了,可是我们发现examples的演示样例程序。仅仅是在源代码包里编译好了。并没有安装到安装文件夹/opt/qwt-6.1.0*下
sinusplot显示正弦余弦曲线
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在QtCreate中或者Designer中使用qwt的控件
cp /opt/qt-4.8.5-x11/qwt-6.1.0/designer/plugins/desinger/* $HOME/qtcreate-2.7.2/bin/plugins/designer/
cp /opt/qt-4.8.5-x11/qwt-6.1.0/designer/plugins/desinger/* /opt/qt-4.8.5-x11/plugins/desinger/
验证一下。打开QtCreate新建一个工程
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眼下发现其它的写的比較好的