invaderGrids.cpp

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#include<iostream>
#include "invadersGrid.h"
 
bool InvadersColumn::hasNoValid() const {
    return getOutterInvader()==size();
}
 
unsigned InvadersColumn::getOutterInvader() const {
    unsigned i=size();
    while(i>0){
        --i;
        if(at(i)!=InvaderType::NONE)return i;
    }
    return size();
}
 
 
// these are used to invoke rand() as less as possible
 
unsigned InvadersColumn::randomValidInv() const {
 
 
    unsigned validTotal = 0;
    for(InvaderType ite : *this){
        if(ite!=InvaderType::NONE)++validTotal;
    }
 
    unsigned rd = rand() % validTotal;
 
    unsigned validIndex = 0;
    for(unsigned i=0;i<size();++i){
        if(at(i)!=InvaderType::NONE){
            if(validIndex==rd)return i;
            ++validIndex;
        }
    }
    throw runtime_error("SHOULD NOT HAPPEN : see randomValidInv()");
}
 
unsigned InvadersGrid::validColsNumber() const {
    unsigned validTotal = 0;
    for(const InvadersColumn& i : *this){
        if(!i.hasNoValid())++validTotal;
    }
    return validTotal;
}
 
unsigned InvadersGrid::randomValidCol() const {
 
 
 
    unsigned rd = rand() % validColsNumber();
 
    unsigned validIndex = 0;
    for(unsigned i=0;i<size();++i){
        if(!at(i).hasNoValid()){
            if(validIndex==rd)return i;
            ++validIndex;
        }
    }
    throw runtime_error("SHOULD NOT HAPPEN : see randomValidCol()");
}