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Maps: Fix spiraling tile iterator end

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The `operator++` of the spiraling tile iterator was repeating the first
coordinates (`0, 0`) instead of moving to the next tile on the first
iteration. Swapping the move and check ensures we get to the end of the
iterator, fixing gray tiles that would sometimes pop up in the lower
right.

Since we never return from `operator++` without setting a valid
position, we can drop `current_x` and `current_y` and just use the
`Gfx::Point<T>` directly.
This commit is contained in:
Jelle Raaijmakers 2023-10-02 22:22:11 +02:00
parent 092bb76cd6
commit eb4dd7f896
1 changed files with 13 additions and 19 deletions
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32
Userland/Applications/Maps/MapWidget.cpp
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@ -379,10 +379,8 @@ public:
T height;
T index { 0 };
T current_x { 0 };
T current_y { 0 };
Gfx::Point<T> last_valid_position { current_x, current_y };
Gfx::Point<T> position { 0, 0 };
constexpr Iterator(T width, T height)
: width(move(width))
@ -401,28 +399,24 @@ public:
constexpr bool operator==(Iterator const& other) const { return index == other.index; }
constexpr bool operator!=(Iterator const& other) const { return index != other.index; }
constexpr Gfx::Point<T> operator*() const { return last_valid_position; }
constexpr Gfx::Point<T> operator*() const { return position; }
constexpr Iterator operator++()
{
auto found_valid_position = false;
while (!found_valid_position && !is_end()) {
// Translating the coordinates makes the range check simpler:
T xp = current_x + width / 2;
T yp = current_y + height / 2;
if (xp >= 0 && xp <= width && yp >= 0 && yp <= height) {
last_valid_position = { current_x, current_y };
found_valid_position = true;
}
while (!is_end()) {
// Figure out in which of the four squares we are.
if (AK::abs(current_x) <= AK::abs(current_y) && (current_x != current_y || current_x >= 0))
current_x += ((current_y >= 0) ? 1 : -1);
if (AK::abs(position.x()) <= AK::abs(position.y()) && (position.x() != position.y() || position.x() >= 0))
position.translate_by(position.y() >= 0 ? 1 : -1, 0);
else
current_y += ((current_x >= 0) ? -1 : 1);
position.translate_by(0, position.x() >= 0 ? -1 : 1);
++index;
// Translating the coordinates makes the range check simpler:
T xp = position.x() + width / 2;
T yp = position.y() + height / 2;
if (xp >= 0 && xp <= width && yp >= 0 && yp <= height) {
break;
}
}
return *this;