UE的 FLinearColor::FLinearColor(const FColor& Color)
时间: 2024-03-20 14:39:40 浏览: 68
在UE4中,FLinearColor和FColor都用于表示颜色,但它们的内存布局和颜色取值范围不同。FColor使用四个8位无符号整数值表示红、绿、蓝和alpha通道,取值范围为0~255。而FLinearColor使用四个32位浮点数值表示红、绿、蓝和alpha通道,取值范围为0~1。
为了方便在两种颜色类型之间进行转换,UE4提供了FLinearColor的构造函数FLinearColor(const FColor& Color),将FColor类型的颜色转换为FLinearColor类型的颜色。以下是示例代码:
```c++
// 创建一个FColor类型的颜色
FColor MyColor(255, 0, 0, 255);
// 将FColor类型的颜色转换为FLinearColor类型的颜色
FLinearColor MyLinearColor(MyColor);
```
在上面的代码中,我们创建了一个FColor类型的颜色MyColor,然后使用FLinearColor的构造函数将它转换为FLinearColor类型的颜色MyLinearColor。
需要注意的是,在进行颜色转换时,FColor的取值范围为0~255,而FLinearColor的取值范围为0~1。因此,在转换过程中,FColor中的每个通道值都会除以255,以适应FLinearColor的取值范围。
相关问题
std::string myplus(const std::string& a, const std::string& b){ }
这是一个函数声明,它声明了一个名为myplus的函数,该函数接受两个const引用类型的std::string参数a和b,并且返回一个std::string类型的值。该函数的实现可能如下:
```cpp
std::string myplus(const std::string& a, const std::string& b) {
return a + b;
}
```
这个函数的作用是将两个字符串a和b拼接在一起,并返回拼接后的结果。
填充下面这个程序中所有出现// TODO: fill the code这个任务的地方#include <iostream> #include <cstring> #include "ourstring.h" #include "strlib.h" using namespace std; OurString::OurString(){ // TODO: fill the code } OurString::OurString(const char *str){ // TODO: fill the code } OurString::OurString(const OurString &dstr){ // TODO: fill the code } OurString::~OurString(){ // TODO: fill the code } string OurString::toString() const{ // TODO: fill the code } OurString OurString::subStr(unsigned int start, unsigned int n) const{ // TODO: fill the code } bool OurString::operator > (const OurString &dstr) const{ // TODO: fill the code } bool OurString::operator < (const OurString &dstr) const{ // TODO: fill the code } bool OurString::operator == (const OurString &dstr) const{ // TODO: fill the code } unsigned int OurString::length () const{ // TODO: fill the code } const OurString& OurString::operator = (const OurString &dstr){ // TODO: fill the code } const OurString& OurString::operator = (const char *str){ // TODO: fill the code } char& OurString::operator[](int index){ // TODO: fill the code } const OurString OurString::operator + (const OurString &dstr) const{ // TODO: fill the code } const OurString OurString::operator + (const char *str) const{ // TODO: fill the code } const OurString& OurString::operator += (const OurString &dstr){ // TODO: fill the code } const OurString& OurString::operator += (const char *str){ // TODO: fill the code } ostream & operator<<(ostream &os, const OurString &dstr){ // TODO: fill the code } istream & operator>>(istream &is, OurString &dstr){ // TODO: fill the code }
好的,下面是填充后的代码,每个 TODO 已经被替换成相应的实现:
```c++
#include <iostream>
#include <cstring>
#include "ourstring.h"
#include "strlib.h"
using namespace std;
OurString::OurString(){
str = new char[1];
str[0] = '\0';
}
OurString::OurString(const char *str){
this->str = new char[strlen(str)+1];
strcpy(this->str, str);
}
OurString::OurString(const OurString &dstr){
this->str = new char[dstr.length()+1];
strcpy(this->str, dstr.str);
}
OurString::~OurString(){
delete [] str;
}
string OurString::toString() const{
return string(str);
}
OurString OurString::subStr(unsigned int start, unsigned int n) const{
if (start >= length()) return OurString();
n = (n > length() - start) ? length() - start : n;
return OurString(str + start, str + start + n);
}
bool OurString::operator > (const OurString &dstr) const{
return strcmp(str, dstr.str) > 0;
}
bool OurString::operator < (const OurString &dstr) const{
return strcmp(str, dstr.str) < 0;
}
bool OurString::operator == (const OurString &dstr) const{
return strcmp(str, dstr.str) == 0;
}
unsigned int OurString::length () const{
return strlen(str);
}
const OurString& OurString::operator = (const OurString &dstr){
if (this != &dstr) {
delete [] str;
str = new char[dstr.length()+1];
strcpy(str, dstr.str);
}
return *this;
}
const OurString& OurString::operator = (const char *str){
if (this->str != str) {
delete [] this->str;
this->str = new char[strlen(str)+1];
strcpy(this->str, str);
}
return *this;
}
char& OurString::operator[](int index){
return str[index];
}
const OurString OurString::operator + (const OurString &dstr) const{
OurString s;
s.str = new char[length() + dstr.length() + 1];
strcpy(s.str, str);
strcat(s.str, dstr.str);
return s;
}
const OurString OurString::operator + (const char *str) const{
OurString s;
s.str = new char[length() + strlen(str) + 1];
strcpy(s.str, this->str);
strcat(s.str, str);
return s;
}
const OurString& OurString::operator += (const OurString &dstr){
*this = *this + dstr;
return *this;
}
const OurString& OurString::operator += (const char *str){
*this = *this + str;
return *this;
}
ostream & operator<<(ostream &os, const OurString &dstr){
os << dstr.str;
return os;
}
istream & operator>>(istream &is, OurString &dstr){
string s;
is >> s;
dstr = s.c_str();
return is;
}
```