Messages

1

Graphics / Re: sf::Transformable::getTransform() broken?

« on: November 06, 2014, 09:09:10 pm »

Many thanks, that last post is very helpful.

2

Graphics / Re: sf::Transformable::getTransform() broken?

« on: November 06, 2014, 08:08:26 pm »

Ok. Then why child drawn over parent? parent global top-left is (50, 50), global coords of "parent origin" m_origin = (0, 0).

What i trying to explain is exact behaviour of SpriteKit. I try understood why SFML and SpriteKit behaves so differently.
(btw, cocos2d behaves like SFML)

3

Graphics / Re: sf::Transformable::getTransform() broken?

« on: November 06, 2014, 07:44:43 pm »

What the "parent origin" is?
This is its top-left corner or m_origin?

4

Graphics / Re: sf::Transformable::getTransform() broken?

« on: November 06, 2014, 02:03:27 pm »

But this is incorrect interpretation of parent-child relationship!
As an example, same parent-child in SpriteKit:

SKSpriteNode *parent = [SKSpriteNode spriteNodeWithColor:[SKColor greenColor] size:CGSizeMake(50, 50)];
[parent setAnchorPoint:CGPointMake(-1, -1)]; // same as {-50, -50} in SFML
[self addChild:parent];
   
SKSpriteNode *child = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(50, 50)];
[child setAnchorPoint:CGPointMake(0, 0)]; // set to {0, 0} because default anchor is {0.5, 0.5}
[parent addChild:child];
 

See attached screenshot: child correctly positioned at parent origin.

5

Graphics / sf::Transformable::getTransform() broken?

« on: November 06, 2014, 12:56:46 pm »

Consider this:

int main(int, char const**)
{
    sf::RenderWindow window(sf::VideoMode(480, 320), "SFML window");
   
    sf::RectangleShape parent;
    parent.setSize({50, 50});
    parent.setFillColor(sf::Color::Green);
    parent.setOrigin({-50, -50});
   
    sf::RectangleShape child;
    child.setSize({50, 50});
    child.setFillColor(sf::Color::Red);
   
    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed) {
                window.close();
            }
        }

        window.clear();
        window.draw(parent);
        // child should be drawn at origin, but instead it drawn over parent.
        window.draw(child, parent.getTransform());
        window.display();
    }
    return EXIT_SUCCESS;
}
 

I think, child should be drawn at parent origin but instead it drawn over parent. It is a bug in getTransform() or I misunderstood something?