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Commit 1ff35d1

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Revise logic elements using inheritance. Add graphical visualisation
1 parent c007407 commit 1ff35d1

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7 files changed

+931
-0
lines changed

7 files changed

+931
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‎projects/CMakeLists.txt‎

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@@ -21,3 +21,5 @@ add_subdirectory(ch12/koch_snowflake)
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add_subdirectory(ch13/cross_wheel)
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add_subdirectory(ch13/fibonacci_spiral)
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add_subdirectory(ch13/hexagon_tile)
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add_subdirectory(ch14/logic_shapes)
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cmake_minimum_required(VERSION 3.20)
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set(TARGET "logic_shapes")
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set(HEADERS
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logic.h
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logic_shapes.h
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${LIB_DIR}/Graph_lib/ext/graph.h
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${LIB_DIR}/Graph_lib/fltk.h
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${LIB_DIR}/Graph_lib/Graph.h
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${LIB_DIR}/Graph_lib/GUI.h
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${LIB_DIR}/Graph_lib/Point.h
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${LIB_DIR}/Graph_lib/Simple_window.h
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${LIB_DIR}/Graph_lib/Window.h
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)
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set(SOURCES
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main.cpp
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logic.cpp
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logic_shapes.cpp
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${LIB_DIR}/Graph_lib/ext/graph.cpp
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${LIB_DIR}/Graph_lib/Graph.cpp
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${LIB_DIR}/Graph_lib/GUI.cpp
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${LIB_DIR}/Graph_lib/Window.cpp
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)
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project(${TARGET} CXX)
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set(FLTK_SKIP_FLUID True)
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set(FLTK_SKIP_FORMS True)
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find_package(FLTK 1.3.8 EXACT REQUIRED)
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find_package(OpenGL REQUIRED)
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include_directories(SYSTEM ${FLTK_INCLUDE_DIR})
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link_directories(${FLTK_INCLUDE_DIR}/../lib)
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add_executable(${TARGET} ${HEADERS} ${SOURCES})
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target_link_libraries(${TARGET} ${FLTK_LIBRARIES} ${OPENGL_LIBRARIES})
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if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
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target_link_libraries(${TARGET} fltk_jpeg fltk_png fltk_z)
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endif()
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install(TARGETS ${TARGET})

‎projects/ch14/logic_shapes/logic.cpp‎

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#include <stdexcept>
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#include "logic.h"
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namespace Logic {
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ElemInput::operator bool () const
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{
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if (elem)
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return inv ? !*elem : *elem;
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else
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return inv;
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}
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void Element::set (bool value)
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{
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if (inverted_out)
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value = !value;
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if (out != value)
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{
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out = value;
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if (cb)
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cb(*this);
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for (auto elem : outputs)
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elem->calc();
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}
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}
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Element& operator>> (Element& lhs, Operation& rhs)
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{
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check_loop(rhs, lhs);
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rhs.inputs.push_back(ElemInput{lhs, false});
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lhs.outputs.push_back(&rhs);
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rhs.calc();
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return rhs;
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}
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Element& operator>> (Element& lhs, Connection rhs)
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{
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check_loop(rhs.oper_elem, lhs);
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rhs.oper_elem.inputs.push_back(ElemInput{lhs, rhs.inverted});
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lhs.outputs.push_back(&rhs.oper_elem);
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rhs.oper_elem.calc();
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return rhs.oper_elem;
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}
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void check_loop (const Element& loop, const Element& elem)
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{
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// checking if elem is the loop
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if (&loop == &elem)
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throw std::runtime_error{"loop detected in connections of logic elements"};
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for (const auto& output : loop.get_outputs())
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check_loop(*output, elem);
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}
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void Source::calc ()
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{
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// nothing to do here
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}
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void And::calc ()
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{
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bool res{ get_inputs().size() != 0 };
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for (const auto& input : get_inputs())
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{
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if (!input)
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{
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res = false;
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break;
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}
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}
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set(res);
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}
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void Or::calc ()
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{
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bool res{ false };
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for (const auto& input : get_inputs())
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{
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if (input)
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{
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res = true;
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break;
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}
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}
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set(res);
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}
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} // namespace Logic

‎projects/ch14/logic_shapes/logic.h‎

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#ifndef LOGIC_H
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#define LOGIC_H 1
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#include <functional>
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#include <vector>
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namespace Logic {
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class Element;
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class Source;
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class Operation;
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struct Connection;
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enum class Out_state
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{
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direct = 0,
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inverted = 1,
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};
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// represents a pair of element and state of inverted property
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struct ElemInput
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{
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ElemInput () = delete;
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ElemInput (const ElemInput& input) = default;
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ElemInput (const Element& input_elem, bool inverted)
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: elem { &input_elem }
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, inv { inverted }
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{}
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ElemInput& operator= (const ElemInput& input) = default;
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operator bool () const;
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const Element* elem;
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bool inv;
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};
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using Logic_callback = std::function<void(const Element&)>;
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using Input_container = std::vector<ElemInput>;
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using Output_container = std::vector<Element*>;
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// abstract logic element
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class Element
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{
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public:
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explicit Element (Out_state st = Out_state::direct, Logic_callback f = nullptr)
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: inverted_out { st == Out_state::inverted }
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, out { inverted_out }
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, cb { f }
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{}
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operator bool () const { return out; }
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bool inverted () const { return inverted_out; }
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const Output_container& get_outputs () const { return outputs; }
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void set_callback (Logic_callback f) { cb = f; }
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protected:
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void set (bool value);
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// abstract method, set() should be called in calc()
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virtual void calc () = 0;
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private:
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bool inverted_out { false };
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bool out { false };
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Logic_callback cb;
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// connections
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Output_container outputs;
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friend Element& operator>> (Element& lhs, Operation& rhs);
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friend Element& operator>> (Element& lhs, Connection rhs);
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friend void check_loop (const Element& loop, const Element& elem);
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};
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class Source : public Element
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{
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public:
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explicit Source (Out_state st = Out_state::direct, Logic_callback f = nullptr)
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: Element{ st, f }
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{}
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Source& operator= (bool value) { set(value); return *this; }
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protected:
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virtual void calc () override;
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};
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// must be used only for connection operation
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struct Connection
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{
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Connection () = delete;
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Connection (const Connection&) = default;
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// constructor without "explicit" keyword
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Connection (Operation& oper, bool inv = false)
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: oper_elem { oper }
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, inverted { inv }
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{}
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Connection& operator= (const Connection&) = delete;
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Connection& operator~ ()
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{
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inverted = !inverted;
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return *this;
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}
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Operation& oper_elem;
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bool inverted;
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};
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class Operation : public Element
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{
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public:
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explicit Operation (Out_state st = Out_state::direct, Logic_callback f = nullptr)
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: Element{ st, f }
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{}
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const Input_container& get_inputs () const { return inputs; }
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Connection operator~ () { return Connection{ *this, true }; }
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private:
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Input_container inputs;
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friend Element& operator>> (Element& lhs, Operation& rhs);
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friend Element& operator>> (Element& lhs, Connection rhs);
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};
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Element& operator>> (Element& lhs, Operation& rhs);
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Element& operator>> (Element& lhs, Connection rhs);
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void check_loop (const Element& loop, const Element& elem);
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class And : public Operation
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{
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public:
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explicit And (Out_state out_inverted = Out_state::direct, Logic_callback f = nullptr)
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: Operation{ out_inverted, f }
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{}
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protected:
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virtual void calc () override;
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};
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class Or : public Operation
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{
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public:
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explicit Or (Out_state st = Out_state::direct, Logic_callback f = nullptr)
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: Operation{ st, f }
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{}
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protected:
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virtual void calc () override;
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};
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} // namespace Logic
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#endif // LOGIC_H

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