嗨,我正在写一些代码,我发现了一个奇怪的错误。函数convert_vector2d(& i_scale)将字符串转换为vector2d(从sf :: vector2f继承)。如果您检查接下来的几行代码,我将执行两次相同的操作。存储返回值,然后使用vs直接使用C++
代码:选择所有
float x = convert_Vector2D(&i_scale).x;
float y = convert_Vector2D(&i_scale).y;
object.SetScale((convert_Vector2D(&i_scale)));
ss = object.GetScale();
object.SetScale(x , y);
ss = object.GetScale();
我第一次调用setScale与convert_vector2d和SS = 1,1返回向量。然后我再次用x,y(存储的结果)调用object.setScale,当我调用object.getScale时,我得到ss = 1,2(这是预期的/正确的)。
我通过了convert函数,它通过两个函数调用返回1,2。
代码:选择为什么我得到不同的行为,所有
const Vector2D Map::convert_Vector2D(std::string * string_to_convert)
{
size_t foundit = 0;
Vector2D temp;
std::string one, two;
if((foundit = string_to_convert->find(',')) != std::string::npos &&
string_to_convert->find_first_of(',') == string_to_convert->find_last_of(',')) // only one comma per line.
{
one = string_to_convert->substr(0, foundit);
two = string_to_convert->substr(foundit+1, string_to_convert->size()); // +1 to skip over the comma.
temp.x = (float)strtod(one.c_str(), NULL);
temp.y = (float)strtod(two.c_str(), NULL);
check_conversion_errors_vector2d(temp, string_to_convert);
}
else
{
Debugger::print("MapLoader: Error: more then one comma on line %d of file %s. Stopping reading of file.\n",
i_Current_Line, mMapName.c_str());
i_QuitParsing = true; // TODO: maybe add return after this line?
}
return temp;
}
任何想法?
void Drawable::SetScale(float ScaleX, float ScaleY)
{
SetScaleX(ScaleX);
SetScaleY(ScaleY);
}
void Drawable::SetScale(const Vector2f& Scale)
{
SetScaleX(Scale.x);
SetScaleY(Scale.y);
}
void Drawable::SetScaleX(float FactorX)
{
if (FactorX > 0)
{
myScale.x = FactorX;
myNeedUpdate = true;
myInvNeedUpdate = true;
}
}
void Drawable::SetScaleY(float FactorY)
{
if (FactorY > 0)
{
myScale.y = FactorY;
myNeedUpdate = true;
myInvNeedUpdate = true;
}
}
SFML拷贝构造函数和成员变量:
// = equals operator assignment
Vector2D& operator=(const Vector2D &rhs)
{
if(this == &rhs)
{
return *this;
}
else
{
this->x = rhs.x;
this->y = rhs.y;
return *this;
}
}
// = equals operator assignment
Vector2D& operator=(const sf::Vector2f &rhs)
{
this->x = rhs.x;
this->y = rhs.y;
return *this;
}
float x, y;
这两个'SetScale()'函数是什么样的? – 2010-09-23 22:36:10
已添加到原始帖子。 – 2010-09-23 22:53:35
你能向我们展示'Vector2f'和'Vector2D'的代码(特别是成员变量和任何拷贝构造函数)吗?我怀疑你可能有两个声明'x'和'y'的成员。 – Doug 2010-09-24 03:09:11