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feat(cmat): pass hints to Ex42 observers

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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>
This commit is contained in:
portersky
2026-10-07 11:31:16 +02:00
co-authored by Qwen 3.8 27B
parent 11b96e4410
commit a65e84e796
7 changed files with 277 additions and 244 deletions
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cmat/Ex42/Pole.cpp
+80 -68
View File
@@ -1,68 +1,80 @@
#include "Pole.h"
#include "Screen.h"
Pole::Pole(int x, int y, Pelican &p) : waitLight(new Light("WAIT", x + 6, y + 12, Screen::WHITE)), myPelican(p) {
myPelican.attach(*this);
using namespace Screen; // we will discuss namespaces in the course
lights[RED_LIGHT] = new Light("*", x + 11, y + 3, RED);
lights[RED_MAN] = new Light("*<-=", x + 6, y + 4, RED);
lights[YELLOW_LIGHT] = new Light("*", x + 11, y + 5, YELLOW);
lights[GREEN_LIGHT] = new Light("*", x + 11, y + 7, GREEN);
lights[GREEN_MAN] = new Light("*|-<", x + 6, y + 7, GREEN);
write(" _____ ", x, ++y, GRAY);
write(" /___ /| ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" | |/| ", x, ++y, GRAY);
write(" |____| | ", x, ++y, GRAY);
write(" | |/| ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" |____|/ ", x, ++y, GRAY);
write(" _||__ ", x, ++y, GRAY);
write(" /___ /| ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" |____|/ ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write("========||===========", x, ++y, GRAY);
write(" / || / ", x, ++y, GRAY);
write("_ /_________ /_ ", x, ++y, GRAY);
write("/ / ", x, ++y, GRAY);
update();
}
Pole::~Pole() {
for (int i = 0; i < sizeof lights / sizeof(lights[0]); ++i)
delete lights[i];
delete waitLight;
}
void Pole::setTrafficLights(Pelican::PelicanState state) {
static const Light::LightState LightStates[Pelican::YELLOW_STATE + 1][RED_MAN + 1] = {
// red yellow green green man red man
{Light::ON, Light::OFF, Light::OFF, Light::ON, Light::OFF}, // red
{Light::OFF, Light::FLASH, Light::OFF, Light::FLASH, Light::OFF}, // y flash
{Light::OFF, Light::OFF, Light::ON, Light::OFF, Light::ON}, // g time
{Light::OFF, Light::OFF, Light::ON, Light::OFF, Light::ON}, // g idle
{Light::OFF, Light::ON, Light::OFF, Light::OFF, Light::ON} // yellow
};
for (int i = RED_LIGHT; i <= RED_MAN; i++) {
lights[i]->set(LightStates[state][i]);
}
}
void Pole::setWaitLight(bool pressed) { waitLight->set(pressed ? Light::ON : Light::OFF); }
void Pole::update() {
setTrafficLights(myPelican.getState());
setWaitLight(myPelican.isPressed());
}
#include "Pole.h"
#include "Pelican.h"
#include "Screen.h"
#include <typeinfo>
Pole::Pole(int x, int y, Pelican &p) : waitLight(new Light("WAIT", x + 6, y + 12, Screen::WHITE)), myPelican(p) {
myPelican.attach(*this);
using namespace Screen; // we will discuss namespaces in the course
lights[RED_LIGHT] = new Light("*", x + 11, y + 3, RED);
lights[RED_MAN] = new Light("*<-=", x + 6, y + 4, RED);
lights[YELLOW_LIGHT] = new Light("*", x + 11, y + 5, YELLOW);
lights[GREEN_LIGHT] = new Light("*", x + 11, y + 7, GREEN);
lights[GREEN_MAN] = new Light("*|-<", x + 6, y + 7, GREEN);
write(" _____ ", x, ++y, GRAY);
write(" /___ /| ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" | |/| ", x, ++y, GRAY);
write(" |____| | ", x, ++y, GRAY);
write(" | |/| ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" |____|/ ", x, ++y, GRAY);
write(" _||__ ", x, ++y, GRAY);
write(" /___ /| ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" | | | ", x, ++y, GRAY);
write(" |____|/ ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write(" || ", x, ++y, GRAY);
write("========||===========", x, ++y, GRAY);
write(" / || / ", x, ++y, GRAY);
write("_ /_________ /_ ", x, ++y, GRAY);
write("/ / ", x, ++y, GRAY);
setTrafficLights(myPelican.getState());
setWaitLight(myPelican.isPressed());
}
Pole::~Pole() {
for (int i = 0; i < sizeof lights / sizeof(lights[0]); ++i)
delete lights[i];
delete waitLight;
}
void Pole::setTrafficLights(Pelican::PelicanState state) {
static const Light::LightState LightStates[Pelican::YELLOW_STATE + 1][RED_MAN + 1] = {
// red yellow green green man red man
{Light::ON, Light::OFF, Light::OFF, Light::ON, Light::OFF}, // red
{Light::OFF, Light::FLASH, Light::OFF, Light::FLASH, Light::OFF}, // y flash
{Light::OFF, Light::OFF, Light::ON, Light::OFF, Light::ON}, // g time
{Light::OFF, Light::OFF, Light::ON, Light::OFF, Light::ON}, // g idle
{Light::OFF, Light::ON, Light::OFF, Light::OFF, Light::ON} // yellow
};
for (int i = RED_LIGHT; i <= RED_MAN; i++) {
lights[i]->set(LightStates[state][i]);
}
}
void Pole::setWaitLight(bool pressed) { waitLight->set(pressed ? Light::ON : Light::OFF); }
void Pole::update(const Hint& hint) {
const WaitHint* waitHintPtr;
waitHintPtr = dynamic_cast<const WaitHint*>(&hint);
const LightHint* lightHintPtr;
lightHintPtr = dynamic_cast<const LightHint*>(&hint);
if (waitHintPtr != nullptr) {
setWaitLight(waitHintPtr->pressed);
}
if (lightHintPtr != nullptr) {
setTrafficLights(lightHintPtr->state);
}
}