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Similarly to raster calculator, mesh calculator can take dataset groups from current mesh layer and combine them with various aritmentic/logical operators to new dataset group.
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python/analysis/auto_generated/mesh/qgsmeshcalculator.sip.in
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| /************************************************************************ | ||
| * This file has been generated automatically from * | ||
| * * | ||
| * src/analysis/mesh/qgsmeshcalculator.h * | ||
| * * | ||
| * Do not edit manually ! Edit header and run scripts/sipify.pl again * | ||
| ************************************************************************/ | ||
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| class QgsMeshCalculator | ||
| { | ||
| %Docstring | ||
| Performs mesh layer calculations. | ||
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| Mesh calculator can do various mathematical operations | ||
| between dataset groups from a single mesh layer. | ||
| Resulting dataset group is added to the mesh layer. | ||
| Result can be filtered by extent or a vector layer mask | ||
| spatially and by selection of times. | ||
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| Note: only dataset groups defined on vertices are | ||
| implemented and supported | ||
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| .. versionadded:: 3.6 | ||
| %End | ||
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| %TypeHeaderCode | ||
| #include "qgsmeshcalculator.h" | ||
| %End | ||
| public: | ||
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| enum Result | ||
| { | ||
| Success, | ||
| Canceled, | ||
| CreateOutputError, | ||
| InputLayerError, | ||
| ParserError, | ||
| InvalidDatasets, | ||
| EvaluateError, | ||
| MemoryError, | ||
| }; | ||
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| QgsMeshCalculator( const QString &formulaString, | ||
| const QString &outputFile, | ||
| const QgsRectangle &outputExtent, | ||
| double startTime, | ||
| double endTime, | ||
| QgsMeshLayer *layer ); | ||
| %Docstring | ||
| Creates calculator with bounding box (rectangular) mask | ||
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| :param formulaString: formula/expression to evaluate. Consists of dataset group names, operators and numbers | ||
| :param outputFile: file to store the resulting dataset group data | ||
| :param outputExtent: spatial filter defined by rectangle | ||
| :param startTime: time filter defining the starting dataset | ||
| :param endTime: time filter defining the ending dataset | ||
| :param layer: mesh layer with dataset groups references in formulaString | ||
| %End | ||
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| QgsMeshCalculator( const QString &formulaString, | ||
| const QString &outputFile, | ||
| const QgsGeometry &outputMask, | ||
| double startTime, | ||
| double endTime, | ||
| QgsMeshLayer *layer ); | ||
| %Docstring | ||
| Creates calculator with geometry mask | ||
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| :param formulaString: formula/expression to evaluate. Consists of dataset group names, operators and numbers | ||
| :param outputFile: file to store the resulting dataset group data | ||
| :param outputMask: spatial filter defined by geometry | ||
| :param startTime: time filter defining the starting dataset | ||
| :param endTime: time filter defining the ending dataset | ||
| :param layer: mesh layer with dataset groups references in formulaString | ||
| %End | ||
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| Result processCalculation( QgsFeedback *feedback = 0 ); | ||
| %Docstring | ||
| Starts the calculation, writes new dataset group to file and adds it to the mesh layer | ||
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| :param feedback: The optional feedback argument for progress reporting and cancelation support | ||
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| :return: QgsMeshCalculator.Success in case of success | ||
| %End | ||
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| static Result expression_valid( const QString &formulaString, QgsMeshLayer *layer ); | ||
| %Docstring | ||
| Returns whether formula is valid for particular mesh layer | ||
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| :param formulaString: formula/expression to evaluate. Consists of dataset group names, operators and numbers | ||
| :param layer: mesh layer with dataset groups references in formulaString | ||
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| :return: QgsMeshCalculator.Success in case of success | ||
| %End | ||
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| }; | ||
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| /************************************************************************ | ||
| * This file has been generated automatically from * | ||
| * * | ||
| * src/analysis/mesh/qgsmeshcalculator.h * | ||
| * * | ||
| * Do not edit manually ! Edit header and run scripts/sipify.pl again * | ||
| ************************************************************************/ |
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| /*************************************************************************** | ||
| qgsmeshcalclexer.ll | ||
| ------------------- | ||
| begin : December 19th, 2018 | ||
| copyright : (C) 2018 by Peter Petrik | ||
| email : zilolv at gmail dot com | ||
| ***************************************************************************/ | ||
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| /*************************************************************************** | ||
| * * | ||
| * This program is free software; you can redistribute it and/or modify * | ||
| * it under the terms of the GNU General Public License as published by * | ||
| * the Free Software Foundation; either version 2 of the License, or * | ||
| * (at your option) any later version. * | ||
| * * | ||
| ***************************************************************************/ | ||
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| %option noyywrap | ||
| %option nounput | ||
| %option case-insensitive | ||
| %option never-interactive | ||
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| // ensure that lexer will be 8-bit (and not just 7-bit) | ||
| %option 8bit | ||
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| %{ | ||
| //directly included in the output program | ||
| #include "qgsmeshcalcnode.h" | ||
| #include "qgsmeshcalcparser.hpp" | ||
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| // if not defined, searches for isatty() | ||
| // which doesn't in MSVC compiler | ||
| #define YY_NEVER_INTERACTIVE 1 | ||
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| #ifdef _MSC_VER | ||
| #define YY_NO_UNISTD_H | ||
| #endif | ||
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| #ifndef _MSC_VER | ||
| #pragma GCC diagnostic ignored "-Wsign-compare" | ||
| #endif | ||
| %} | ||
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| white [ \t\r\n]+ | ||
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| dig [0-9] | ||
| num1 {dig}+\.?([eE][-+]?{dig}+)? | ||
| num2 {dig}*\.{dig}+([eE][-+]?{dig}+)? | ||
| number {num1}|{num2} | ||
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| non_ascii [\x80-\xFF] | ||
| dataset_ref_char [A-Za-z0-9_./:]|{non_ascii}|[-] | ||
| dataset_ref ({dataset_ref_char}+) | ||
| dataset_ref_quoted \"(\\.|[^"])*\" | ||
| %% | ||
| "sum_aggr" { meshlval.op = QgsMeshCalcNode::opSUM_AGGR; return FUNCTION; } | ||
| "max_aggr" { meshlval.op = QgsMeshCalcNode::opMAX_AGGR; return FUNCTION; } | ||
| "min_aggr" { meshlval.op = QgsMeshCalcNode::opMIN_AGGR; return FUNCTION; } | ||
| "average_aggr" { meshlval.op = QgsMeshCalcNode::opAVG_AGGR; return FUNCTION; } | ||
| "abs" { meshlval.op = QgsMeshCalcNode::opABS; return FUNCTION; } | ||
| "max" { meshlval.op = QgsMeshCalcNode::opMAX; return FUNCTION2; } | ||
| "min" { meshlval.op = QgsMeshCalcNode::opMIN; return FUNCTION2; } | ||
| "IF" { return IF; } | ||
| "AND" { return AND; } | ||
| "OR" { return OR; } | ||
| "NOT" { return NOT; } | ||
| "!=" { return NE; } | ||
| "<=" { return LE; } | ||
| ">=" { return GE; } | ||
| "NODATA" {return NODATA;} | ||
| [=><+-/*^] { return yytext[0]; } | ||
| [()] { return yytext[0]; } | ||
| {number} { meshlval.number = atof(meshtext); return NUMBER; } | ||
| {dataset_ref} { return DATASET_REF; } | ||
| {dataset_ref_quoted} { return DATASET_REF; } | ||
| {white} /* skip blanks and tabs */ | ||
| %% | ||
| void set_mesh_input_buffer(const char* buffer) | ||
| { | ||
| mesh_scan_string(buffer); | ||
| } |
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