Mathematical expression parser for strings and ofxGui, based on muParser
Precompiled OS X library included (Intel and Apple Silicon).
For Windows/Linux check out libs/muparser/src submodule and follow the instrtuctions in Install.txt file.
Tested with openFrameworks version 0.11.1 (C++ 11)
Supported return value types:
- float
ofxFloatExpr - glm::vec2
ofxExpr<glm::vec2> - glm::vec3
ofxExpr<glm::vec3> - glm::vec4
ofxExpr<glm::vec4> - glm::mat2
ofxExpr<glm::mat2> - glm::mat3
ofxExpr<glm::mat3> - glm::mat4
ofxExpr<glm::mat4>
- arithmetic
float x = 123.0;
float y = 678.0;
float z = 57.0;
ofxFloatExpr expr1;
expr1.set("x * y + 3");
expr1.addVar("x", x, false);
expr1.addVar("y", y);
expr1.addVar("z", z);
cout << "x = " << x << endl; // x = 123
cout << "y = " << y << endl; // y = 678
cout << "z = " << z << endl; // z = 57
cout << expr1.getExpression() << " = " << expr1.get() << endl; // x * y + 3 = 83397- trigonometry
float x = 2;
ofxFloatExpr expr2;
expr2.set("sin(x)");
expr2.addVar("x", x);
cout << expr2.getExpression() << " = " << expr2.get() << endl; // sin(x) = 0.909297- built-in variables
t = ofGetElapsedTimef();
ofxFloatExpr expr3;
expr3.set("t");
cout << expr3.getExpression() << " = " << expr3.get() << endl; // t = 1.2177- built-in functions
float x = 2;
ofxFloatExpr expr4;
expr4.set("rand(x)");
expr4.addVar("x", x);
cout << expr4.getExpression() << " = " << expr4.get() << endl; // rand(x) = 0.37822
cout << expr4.getExpression() << " = " << expr4.get() << endl; // rand(x) = 0.736426
expr4.set("noise(x)");
expr4.addVar("x", x);
cout << expr4.getExpression() << " = " << expr4.get() << endl; // noise(x) = 0.5