75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
#include "Inky.hpp"
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namespace pacman {
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Inky::Inky()
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: Ghost(Atlas::Ghost::inky) {
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pos = initialPosition();
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}
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double Inky::speed() const {
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if (state == State::Eyes)
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return 2;
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if (state == State::Frightened)
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return 0.5;
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return 0.75;
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}
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void Inky::setTarget(GridPosition pacManPos, Direction pacManDir, GridPosition blinkyPos) {
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if (state == State::Eyes) {
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target = initialPosition();
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return;
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}
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if (isInPen()) {
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target = penDoorPosition();
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return;
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}
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if (state == State::Scatter) {
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target = scatterTarget();
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return;
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}
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// Inky first selects a position 2 cell away from pacman in his direction.
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GridPosition targetPosition = pacManPos;
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switch (pacManDir) {
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case Direction::LEFT:
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targetPosition.x -= 2;
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break;
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case Direction::RIGHT:
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targetPosition.x += 2;
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break;
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case Direction::UP:
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targetPosition.y -= 2;
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targetPosition.x -= 2;
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break;
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case Direction::DOWN:
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targetPosition.y += 2;
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break;
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case Direction::NONE:
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assert(false && "Pacman should be moving");
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break;
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}
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// Then it calculates the distance between Blinky and this position
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const double distanceBetweenBlinkyAndTarget = std::hypot(blinkyPos.x - targetPosition.x, blinkyPos.y - targetPosition.y);
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// And selects a point on the line crossing blinky and
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// this position that is at twice that distance away from blinky
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targetPosition.x += std::size_t((double(targetPosition.x) - double(blinkyPos.x)) / distanceBetweenBlinkyAndTarget) * 2;
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targetPosition.y += std::size_t((double(targetPosition.y) - double(blinkyPos.y)) / distanceBetweenBlinkyAndTarget) * 2;
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target = gridPositionToPosition(targetPosition);
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}
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Position Inky::initialPosition() const {
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return { 13.5, 14 };
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}
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Position Inky::scatterTarget() const {
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return { 27, 30 };
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}
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} // namespace pacman
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