OpenCPN, selon Shoreline |
Plan du
site ---> Les compléments
---> La calculette |
P_14 | Calculette |
Validité : 4.8.4 |
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Activation du
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Après l'installation
d'OpenCPN, la barre d'icônes du haut de l'écran, ne comporte pas
l'icône de l'outil "Calculator" L'outil "Calculator", c'est son nom, n'est pas en service. |
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L'icône
"Calculator" est présente dans la barre d'icônes. |
L'icône
"Calculator" et son infobulle. |
Les affichages |
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Calculator Plugin for OpenCPN by SaltyPaws aka Walbert Schulpen. Calculator muparser Windows fix by Mike R –Thank you Mike! Goals This is a light weight yet powerful calculator plugin for OpenCPN which includes functions to solve nautical questions. Would you like to know your hull speed? Increase of draft due to heel. More functions can be added by the author. Key features are: Storing results in variables Shows historic calculations Full complement of nautical functions Screen footprint can be optimized & minimized as required Adding formulas is easy. If your favorite nautical equation is missing, please let me know your equation via flyspray, and I will add it. Requirements OpenCPN 4.2.0 and above. Linux or Windows Source code This plugin is available for Linux and Windows. They are in separate github repositories. The Windows version has been fixed to work with muparser. At some stage it is hoped to merge them. Windows version: https://github.com/Rasbats/calculator_pi/releases (link) Linux version: https://github.com/SaltyPaws/calculator_pi (link) Initial announcement on the Cruisers Forum http://www.cruisersforum.com/forums/f134/plugin-calculator (link) Also discussed here http://www.cruisersforum.com/forums/f134/plugin-calculator-windows-version-178199.html (link) Use The calculator plugin allows you to carry out all nautical calculations, without having to leave the OpenCPN environment. The scientific calculator is capable of working with, and retaining variables. * When starting the plugin for the first time, go to to find the plugin tab. Click on the calculator plugin, then the “Enable” button. Back in the OpenCPN menu the calculator icon brings up the calculator. Tick the “Help” tickbox to bring up a comprehensive help screen. Unticking the help button brings you back to the calculator only interface and resizes the menu to the original size. Enter calculations in the box and press enter or “Calculate” for evaluation. Press the up or down button, to retrieve historic input and results (max 30). Help Type help in the calculator to get these instructions. Examples Examples of expressions that work in the calculator are: (comments are in brackets, some results depend on other example calculations): Hull speed: LWL=48 (water line length in feet) vhull=1.34*LWL^(1/2) (hull speed in knots) Conversions: ftm=0.3048 (feet to meters) km_to_nm=0.539957 (Kilometers to nautical Mile) ftm*LWL (waterline length in meters) Distance to horizon R=6378.1*1000 (Radius of the earth in m) H=2.5 (Height of the eye above sea-level in m) d = R * acos(R/(R + h)) (Distance to horizon in m) ans*km_to_nm (Distance to horizon in nm) Distance to lighthouse H1=200 (height of lighthouse in m) d1 = R*acos(R/(R + H1)) (Distance to horizon in m) distance=d1+d (visibility range of lighthouse in m) Useful Notes Ans is the result of the previous calculation Variables can be defined (e.g. myvariable=10/8*cos(dtr*90) or yourvariable=Ans) % modulus - Divides the value of one expression by the value of another, and returns the remainder. ! factorial Sign Returns .-1 for negative numbers and 1 for positive numbers Factorial Variables: Pi, e dtr is the conversion factor from degrees to radians Built-in functions The following table gives an overview of the functions supported by the default implementation. It lists the function names, the number of arguments and a brief description. Name Argc. Explanation TRIGONOMETRY default entry use radians e.g. sin(dtr*90) to calculate in degrees sin 1 sine function cos 1 cosine function tan 1 tangens function asin 1 arcus sine function acos 1 arcus cosine function atan 1 arcus tangens function sinh 1 hyperbolic sine function cosh 1 hyperbolic cosine tanh 1 hyperbolic tangens function asinh 1 hyperbolic arcus sine function acosh 1 hyperbolic arcus tangens function atanh 1 hyperbolic arcur tangens function LOGARITHMIC log2 1 logarithm to the base 2 log10 1 logarithm to the base 10 log 1 logarithm to the base 10 ln 1 logarithm to base e (2.71828…) OTHER exp 1 e raised to the power of x sqrt 1 square root of a value sign 1 sign function -1 if x<0; 1 if x>0 rint 1 round to nearest integer abs 1 absolute value min var. min of all arguments max var. max of all arguments sum var. sum of all arguments avg var. mean value of all arguments Built-in binary operators The following table lists the default binary operators supported by the parser. Operator Meaning Priority = assignment -1 && logical and 1 || logical or 2 ⇐ less or equal 4 >= greater or equal 4 != not equal 4 == equal 4 > greater than 4 < less than 4 + addition 5 - subtraction 5 * multiplication 6 / division 6 ^ raise x to the power of y 7 ^ use ^(1/2) for square root 7 * The assignment operator is special since it changes one of its arguments and can only by applied to variables. Other operators MuParser muParser has built in support for the if.. then.. else operator. It uses lazy evaluation in order to make sure only the necessary branch of the expression is evaluated. Operator Meaning ?: if then else operator Variables: pi, e well known ans the result of the previous calculation dtr conversion factor from degrees to radians Define variables e.g. myvariable=10/8*cos(dtr*90) or yourvariable=ans clear removes results in the history and leaves defined variables in tact User Interface: Type these commands in the command window: history Toggle the history panel showhelp Show/Hide the Help button showcalculate Show/Hide the Calculate button showhistory Show/Hide the history toggle help show the help menu Settings/Plugins/Preferences: Show/Hide Calculate Help and History toggle buttons History Settings: max Results -this is the number of results that will be stored in the history pull down. The history pulldown will contain five times this value. Log to opencpn: Enable/Disable logging of results to opencpn logfile. Other: Error handling supported MuParser has been compiled with C++ Double for internal precision. Compiling You have to be able to compile OpenCPN itself - Get the info atDevolpers Manual git clone https://github.com/SaltyPaws/Calc_pi_muparser.git Build out of OpenCPN branch! in folder calculator_pi mkdir build cd build cmake .. make sudo make installf After using wxformbuilder to modify the interface, use degreefix.sh, to facilitate the windows build. When updating the Excel file with formulas and conversions, convert to cpp code by running the supplied perl script Changes to version 1.6 Added Willson Fetch Equation Added wind speed to Beaufort equation Changed to MuParser math interface Added History pulldown box, improved history box behaviour Added reporting modes (1000 separator, SI prefixes, accuracy) Added function button in OpenCPN toolbar, with option to switch off from plugin settings Minor tweaks and fixes SaltyPaws aka Walbert Schulpen Support for Diagrams I believe the plugin supports small jpg & png images for the purpose of better visualization. What is needed to implement this system is some diagrams and more knowledge about the plugin. Rgleason Early Executables Earlier compiled library files can be downloaded/uploaded here. https://sourceforge.net/projects/opencpnplugins/ License The plugin is licensed under the terms of GPL v2 or, at your will, later. The MuParser files are by Ingo Berg and is open source. For full licence, please see the muparser source files. |
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