porterskyandQwen 3.8 27B
a65e84e796
Extend the Ex42 observer pattern with Hint objects so each observer receives the reason for the update instead of querying the subject: - Subject::notify() and Observer::update() now take a const Hint& argument. - Add LightHint and WaitHint carrying the traffic light state and WAIT button state, defined in Pelican.h. - Pole dispatches on hint type using dynamic_cast. - The Pole constructor sets its initial lights directly from the Pelican's current state, since no notification is sent at startup. Stopgap until the initial update is handled properly. Co-authored-by: Qwen 3.8 27B <qwen3.8_27b-q3_k_xl@lmstudio.local>
81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
#include "Pole.h"
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#include "Pelican.h"
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#include "Screen.h"
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#include <typeinfo>
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Pole::Pole(int x, int y, Pelican &p) : waitLight(new Light("WAIT", x + 6, y + 12, Screen::WHITE)), myPelican(p) {
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myPelican.attach(*this);
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using namespace Screen; // we will discuss namespaces in the course
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lights[RED_LIGHT] = new Light("*", x + 11, y + 3, RED);
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lights[RED_MAN] = new Light("*<-=", x + 6, y + 4, RED);
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lights[YELLOW_LIGHT] = new Light("*", x + 11, y + 5, YELLOW);
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lights[GREEN_LIGHT] = new Light("*", x + 11, y + 7, GREEN);
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lights[GREEN_MAN] = new Light("*|-<", x + 6, y + 7, GREEN);
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write(" _____ ", x, ++y, GRAY);
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write(" /___ /| ", x, ++y, GRAY);
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write(" | | | ", x, ++y, GRAY);
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write(" | |/| ", x, ++y, GRAY);
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write(" |____| | ", x, ++y, GRAY);
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write(" | |/| ", x, ++y, GRAY);
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write(" | | | ", x, ++y, GRAY);
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write(" |____|/ ", x, ++y, GRAY);
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write(" _||__ ", x, ++y, GRAY);
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write(" /___ /| ", x, ++y, GRAY);
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write(" | | | ", x, ++y, GRAY);
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write(" | | | ", x, ++y, GRAY);
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write(" |____|/ ", x, ++y, GRAY);
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write(" || ", x, ++y, GRAY);
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write(" || ", x, ++y, GRAY);
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write(" || ", x, ++y, GRAY);
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write(" || ", x, ++y, GRAY);
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write(" || ", x, ++y, GRAY);
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write(" || ", x, ++y, GRAY);
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write("========||===========", x, ++y, GRAY);
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write(" / || / ", x, ++y, GRAY);
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write("_ /_________ /_ ", x, ++y, GRAY);
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write("/ / ", x, ++y, GRAY);
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setTrafficLights(myPelican.getState());
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setWaitLight(myPelican.isPressed());
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}
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Pole::~Pole() {
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for (int i = 0; i < sizeof lights / sizeof(lights[0]); ++i)
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delete lights[i];
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delete waitLight;
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}
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void Pole::setTrafficLights(Pelican::PelicanState state) {
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static const Light::LightState LightStates[Pelican::YELLOW_STATE + 1][RED_MAN + 1] = {
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// red yellow green green man red man
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{Light::ON, Light::OFF, Light::OFF, Light::ON, Light::OFF}, // red
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{Light::OFF, Light::FLASH, Light::OFF, Light::FLASH, Light::OFF}, // y flash
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{Light::OFF, Light::OFF, Light::ON, Light::OFF, Light::ON}, // g time
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{Light::OFF, Light::OFF, Light::ON, Light::OFF, Light::ON}, // g idle
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{Light::OFF, Light::ON, Light::OFF, Light::OFF, Light::ON} // yellow
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};
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for (int i = RED_LIGHT; i <= RED_MAN; i++) {
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lights[i]->set(LightStates[state][i]);
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}
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}
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void Pole::setWaitLight(bool pressed) { waitLight->set(pressed ? Light::ON : Light::OFF); }
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void Pole::update(const Hint& hint) {
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const WaitHint* waitHintPtr;
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waitHintPtr = dynamic_cast<const WaitHint*>(&hint);
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const LightHint* lightHintPtr;
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lightHintPtr = dynamic_cast<const LightHint*>(&hint);
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if (waitHintPtr != nullptr) {
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setWaitLight(waitHintPtr->pressed);
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}
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if (lightHintPtr != nullptr) {
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setTrafficLights(lightHintPtr->state);
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}
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}
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