Hi,
I'm trying to make a mask (2d vector of boolean) from a rotated sprite. When I print the mask to the console as 1 for true, and 0 for false, the 1s are never where I would expect them to be. Here is one exemple of a case that I dont understand.
void maskByAngle::buildMasks(bar aBar)
{
if(aBar.isLeft()){
int angle = -30;
Texture wtvTexture;
Sprite tempSprite;
wtvTexture.loadFromFile("Ressources/bar_left.png");
tempSprite.setTexture(wtvTexture);
tempSprite.setOrigin(0,tempSprite.getLocalBounds().height/2);
while(angle <= 30){
RenderTexture newRT;
newRT.create(tempSprite.getGlobalBounds().width, tempSprite.getGlobalBounds().height);
tempSprite.setPosition(0,0);
newRT.draw(tempSprite);
Texture myTexture = newRT.getTexture();
Image myImage = myTexture.copyToImage();
newRT.clear(Color::Black);
std::cout << "X = " << myImage.getSize().x << " Y = " << myImage.getSize().y << endl;
vector<vector<bool>> vBBTemp;
for(int y = 0; y < myImage.getSize().y; ++y){
vector<bool> vBTemp;
for(int x = 0; x < myImage.getSize().x; ++x){
if(myImage.getPixel(x,y).a > 200){
vBTemp.push_back(true);
std::cout << 1;
}else{
vBTemp.push_back(false);
std::cout << 0;
}
}
std::cout << endl;
vBBTemp.push_back(vBTemp);
}
myMasksLeft.push_back(vBBTemp);
++angle;
}
}else if(!aBar.isLeft()){
In the case I just printed, I get this in the console for the case where the angle = 0.
Even if you see a cout mentionning compensation, I am not applying it. Nevertheless, what I see in the console is not far from what I would expect. I expected the image to be a inverted version of this one. The 1s should be top, not at the bottom of the console output. Since my origin is at half-height, I know I'm suppose to "lose" half of the pixels, but why do I lose the bottom ones? Furthermore, I tried to draw the Sprite to my renderwindow before building my image, and It shows exactly what I would expect to find in my console :
Furthermore, I tried something while writting this post and I found that if I print the image like this :
Texture aTexture;
aTexture.loadFromImage(myImage);
Sprite aSprite(aTexture);
myWin.draw(aSprite);
I actually get the same result I got by printing in the console. But why!? Why are the pixels inverted in the image?
Hope I was clear.
******************EDIT*********************
Sorry about the language, I didnt notice it was the french section of the forum (I am french canadian....)
Anyways, I tested something using renderTexture and I now know that render texture inverts the pixels. Here is the code I used to test (I tried to make it testable for others but you'll need your own renderwindow) :
Sprite utilitySprite;
Texture utilityTexture;
utilityTexture.loadFromFile("Ressources/meteor.png");
utilitySprite.setTexture(utilityTexture);
utilitySprite.setPosition(200,0);
MyWin.draw(utilitySprite);
RenderTexture newRT;
Image newImage;
Texture newTexture;
utilitySprite.setPosition(0,0);
newRT.create(utilitySprite.getLocalBounds().width, utilitySprite.getLocalBounds().height);
newRT.clear(Color::Yellow);
newRT.draw(utilitySprite);
newTexture = newRT.getTexture();
newImage = newTexture.copyToImage();
Texture aTexture;
aTexture.loadFromImage(newImage);
//Sprite newSprite(aTexture);
Sprite newSprite(newRT.getTexture());
newSprite.setPosition(400,0);
MyWin.draw(newSprite);
here is what was rendered :
Am I doing something wrong ? or should I flip the texture myself?
