void Map::getPlatformDimensions (int gridX, int startTraceGridY, int *start, int *end) const
{
const int endTraceGridY = startTraceGridY + 1;
if (gridX > 0) {
IEntity *hit = nullptr;
trace(gridX, startTraceGridY, 0, startTraceGridY, &hit);
int leftGridX = 0;
if (hit && hit->isSolid()) {
MapTile *mapTile = static_cast<MapTile*>(hit);
leftGridX = mapTile->getGridX() + mapTile->getGridWidth();
}
int startTraceGridX = gridX;
const int steps = startTraceGridX - leftGridX;
for (int i = 0; i < steps; ++i) {
const b2Vec2 startV(startTraceGridX - 0.5f, startTraceGridY + 0.5f);
const b2Vec2 endV(startTraceGridX - 0.5f, endTraceGridY + 0.2f);
const bool state = trace(startV, endV, &hit);
if (state && hit && hit->isSolid()) {
--startTraceGridX;
continue;
}
break;
}
*start = startTraceGridX;
} else {
IEntity *hit = nullptr;
const b2Vec2 startV(0, startTraceGridY);
const b2Vec2 endV(0, startTraceGridY + 0.0001f);
const bool state = trace(startV, endV, &hit);
if (state && hit && hit->isSolid())
return;
*start = 0;
}
if (gridX < _width - 1) {
IEntity *hit = nullptr;
trace(gridX, startTraceGridY, _width - 1, startTraceGridY, &hit);
int rightGridX = _width - 1;
if (hit && hit->isSolid()) {
MapTile *mapTile = static_cast<MapTile*>(hit);
// we always subtract 1 here - not the width - it's the left side
rightGridX = mapTile->getGridX() - 1;
}
int endTraceGridX = gridX;
const int steps = rightGridX - endTraceGridX;
for (int i = 0; i < steps; ++i) {
const b2Vec2 startV(endTraceGridX + 1.5f, startTraceGridY + 0.5f);
const b2Vec2 endV(endTraceGridX + 1.5f, endTraceGridY + 0.2f);
const bool state = trace(startV, endV, &hit);
if (state && hit && hit->isSolid()) {
++endTraceGridX;
continue;
}
break;
}
*end = endTraceGridX;
} else {
IEntity *hit = nullptr;
const b2Vec2 startV(_width - 1.0f, startTraceGridY);
const b2Vec2 endV(_width - 1.0f, startTraceGridY + 0.0001f);
const bool state = trace(startV, endV, &hit);
if (state && hit && hit->isSolid())
return;
*end = _width - 1;
}
}
