Messages

1

Graphics / Re: Stop drawing pixels out of region

« on: November 22, 2014, 02:30:32 pm »

Thanks, it works.
Here's my code. Maybe it will help someone.

View newV;
newV.setSize(size(vp));
newV.setCenter(globalCenter(vp));
newV.setRotation(getRotation());
Vector2f vpPos(getPosition().x / target.getSize().x, getPosition().y / target.getSize().y);
Vector2f vpSz((size(vp).x * getScale().x) / target.getSize().x, (size(vp).y * getScale().y) / target.getSize().y);
newV.setViewport(FloatRect(vpPos, vpSz));
target.setView(newV);
 

2

Graphics / Re: Stop drawing pixels out of region

« on: November 21, 2014, 07:23:47 pm »

It doesn't work or I do something wrong.
The whole problem is because I'm rendering a physics simulation that have its own coordinates.
And I want to render specified rect of physics simulation to specified rect on window (not on whole window)

// some useful inlines that are missing in SFML
inline Vector2f size(const FloatRect& rect)
{
    return Vector2f(rect.width, rect.height);
}

inline Vector2f pos(const FloatRect& rect)
{
    return Vector2f(rect.left, rect.top);
}

inline Vector2f localCenter(const FloatRect& rect)
{
    return size(rect) * 0.5f;
}

inline Vector2f globalCenter(const FloatRect& rect)
{
    return pos(rect) + localCenter(rect);
}

void WorldRender::draw(RenderTarget &target, RenderStates states) const
{
    //states.transform *= getTransform(); // i don't need Transformable transform because i use the same transform in view

// vp is source region of simulation

    // view set
    View oldV = target.getView();
    View newV;
newV.setRotation(getRotation());
    newV.setSize(size(vp));
    newV.setCenter(globalCenter(vp));
    newV.setViewport(FloatRect(getPosition(), Vector2f(size(vp).x * getScale().x, size(vp).y * getScale().y)));
    target.setView(newV);

// only for example    
CircleShape cs(50);
    cs.setPosition(0, 0);
    cs.setFillColor(Color::Black);
    target.draw(cs, states);

//...

target.setView(oldV); // restore old view
}
 

And in this case NOTHING renders. Even simple circle  (cs in my code).
But out of this function everything works properly.

3

Graphics / Re: Stop drawing pixels out of region

« on: November 21, 2014, 05:26:58 pm »

So i have another question: does view transformations applies on end of frame or for each draw()?
I'm asking it because i have idea:

virtual void draw(RenderTarget& target, RenderStates rs)
{
rs.transform *= getTransform();

View oldV = target.getView();

View newV;
// setting parameters of new view
target.setView(newV);

// draw my stuff

target.setView(oldV);
 

Does my stuff draw with newV wiew or oldV view?
Can I apply view on only a few of objects?

4

Graphics / Re: Stop drawing pixels out of region

« on: November 20, 2014, 07:29:34 pm »

Shaders isn't my best side

5

Graphics / Stop drawing pixels out of region

« on: November 20, 2014, 07:23:14 pm »

I'm drawing lots of rotated sprites.
And i have to draw some of this sprites partly - that ones, that are partly out of given region.
Briefly, I want do draw only that pixels of sprites that are in specified region.
Effect have to be like using sf::View but on single drawable object

PS I do it in my own Drawable component so i can't use sf::View::setViewport().

Any ideas?

6

Graphics / Re: Textured shape - texture not rotate (SFML + Box2d)

« on: February 16, 2014, 12:04:21 pm »

Must I use setOrigin() and setRotation()? Maybe can I use glRotatef() before creating shape?

/edit: It doesn't work. 
I've got a screen like these:


My code:

// comments for this code are in first post
void Body::displayBody(RenderWindow &win, b2Body *b, Texture** fillTexture)
{
    bool autoInterpolate = true;

    int i = 0;
    for(b2Fixture* f = b->GetFixtureList(); f; f = f->GetNext(), i++)
    {
        b2Shape* sh = f->GetShape();
        b2AABB aabb = f->GetAABB(0);
        Transform st = Transform::Identity;
        //st.rotate(RDtoDG(b->GetAngle()), B2toSF(aabb.GetCenter()));

        if(fillTexture[i] && autoInterpolate)
            fillTexture[i]->setSmooth(true);

        switch(sh->GetType())
        {
        case b2Shape::e_polygon:
        {          
            b2PolygonShape* s = dynamic_cast<b2PolygonShape*>(sh);
            ConvexShape cs(s->GetVertexCount());
            if(fillTexture[i])
                cs.setTexture(fillTexture[i]);
            else
                cs.setFillColor(Color::Red);

            cs.setOrigin(B2toSF(aabb.GetCenter() - aabb.lowerBound)); // GetCenter() is in body coordinates
            cs.setPosition(Vector2f() - cs.getOrigin()); // set left-top position to zero
            cs.rotate(RDtoDG(b->GetAngle()));

            for(int i = 0; i < s->GetVertexCount(); i++)
                cs.setPoint(i, B2toSF(b->GetWorldPoint(s->GetVertex(i))));
            win.draw(cs);
            break;
        }
        case b2Shape::e_circle:
        {
            static const float pi = 3.141592654f;
            b2CircleShape* s = dynamic_cast<b2CircleShape*>(sh);
            int pts = 30;
            ConvexShape cs(pts);
            if(fillTexture[i])
                cs.setTexture(fillTexture[i]);
            else
                cs.setFillColor(Color::Blue);

            cs.setOrigin(B2toSF(aabb.GetCenter() - aabb.lowerBound));
            cs.setPosition(B2toSF(b->GetWorldPoint(aabb.GetCenter())));
            cs.rotate(RDtoDG(b->GetAngle()));

            // calculating circle points manually
            float rad = B2toSF(s->m_radius);
            Vector2f center = B2toSF(b->GetWorldPoint(aabb.GetCenter()));
            for(int i = 0; i < pts; i++)
            {
                float angle = i * 2 * pi / pts - pi / 2;
                cs.setPoint(i, Vector2f(center.x + cos(angle) * rad, center.y + sin(angle) * rad));
            }
            win.draw(cs);
            break;
        }
        case b2Shape::e_edge:
        {
            b2EdgeShape* s = dynamic_cast<b2EdgeShape*>(sh);
            VertexArray va(sf::Lines, 2);
            va[0].position = B2toSF(b->GetWorldPoint(s->m_vertex1));
            va[0].color = Color::White;
            va[1].position = B2toSF(b->GetWorldPoint(s->m_vertex2));
            va[1].color = Color::White;

            win.draw(va);
            break;
        }
        case b2Shape::e_chain:
        {
            b2ChainShape* s = dynamic_cast<b2ChainShape*>(sh);

            for (int32 i = 0; i < s->GetChildCount(); ++i)
            {
                b2EdgeShape edge;
                s->GetChildEdge(&edge, i);
                VertexArray va(sf::Lines, 2);
                va[0].position = B2toSF(b->GetWorldPoint(edge.m_vertex1));
                va[0].color = Color::White;
                va[1].position = B2toSF(b->GetWorldPoint(edge.m_vertex2));
                va[1].color = Color::White;

                win.draw(va);
            }
            break;
        }
        }
    }
}
 

7

Graphics / Textured shape - texture not rotate (SFML + Box2d)

« on: February 15, 2014, 02:33:18 pm »

Hi!
I'm writing an offroad 2d game using Box2d and SFML. And i have got a problem with texturing objects - texture of the shape don't rotate with it ->

// B2toSF() and SFtoB2() convert units beetween pixels and Box2d
// RDtoDG() convert radians to degreeses
void Body::displayBody(RenderWindow &win, b2Body *b, const Texture** fillTexture)
// draws all fixtures in *b on win
// fillTexture is ptr to list of ptrs to textures to all fixtures, NULL is NO TEXTURING
{
    int i = 0;
    for(b2Fixture* f = b->GetFixtureList(); f; f = f->GetNext(), i++)
    // for each fixtures in body
    {
         // shape and aabb of body - don't interest with it, it's box2d utility
        b2AABB aabb = f->GetAABB(0);
        b2Shape* sh = f->GetShape();
        RenderStates st; // transform for all shapes
       
        // rotate shape by center of its aabb
        st.transform.rotate(RDtoDG(b->GetAngle()), B2toSF(aabb.GetCenter()));

        switch(sh->GetType())
        {
        case b2Shape::e_polygon: // polygon shape
        {
            b2PolygonShape* s = dynamic_cast<b2PolygonShape*>(sh);
            ConvexShape cs(s->GetVertexCount());
            // shapes are NOT ROTATED, RenderStates::transform contains their rotation
            if(fillTexture[i])
                cs.setTexture(fillTexture[i]);
            else
                cs.setFillColor(Color::Red);
            for(int i = 0; i < s->GetVertexCount(); i++)
                cs.setPoint(i, B2toSF(b->GetWorldPoint(s->GetVertex(i))));
                // GetWorldPoint() translates local position to global coordinates
            win.draw(cs, st);
            break;
        }
        case b2Shape::e_circle: // circle
        {
            b2CircleShape* s = dynamic_cast<b2CircleShape*>(sh);
            CircleShape cs(B2toSF(s->m_radius));
            cs.setPosition(B2toSF(aabb.lowerBound)); // left-top of aabb
            if(fillTexture[i])
                    cs.setTexture(fillTexture[i]);
            else
                cs.setFillColor(Color::Blue);
            win.draw(cs, st);
            break;
        }
        case b2Shape::e_edge:
        // edge and chain cannot be textured
        {
            b2EdgeShape* s = dynamic_cast<b2EdgeShape*>(sh);
            VertexArray va(sf::Lines, 2);
            va[0].position = B2toSF(b->GetWorldPoint(s->m_vertex1));
            va[0].color = Color::White;
            va[1].position = B2toSF(b->GetWorldPoint(s->m_vertex2));
            va[1].color = Color::White;

            win.draw(va, st);
            break;
        }
        case b2Shape::e_chain: // chain is list of edges
        {
            b2ChainShape* s = dynamic_cast<b2ChainShape*>(sh);

            for (int32 i = 0; i < s->GetChildCount(); ++i) // for each edges in chain
            {
                // draw child edge
                b2EdgeShape edge;                
                s->GetChildEdge(&edge, i);
                VertexArray va(sf::Lines, 2);
                va[0].position = B2toSF(b->GetWorldPoint(edge.m_vertex1));
                va[0].color = Color::White;
                va[1].position = B2toSF(b->GetWorldPoint(edge.m_vertex2));
                va[1].color = Color::White;

                win.draw(va, st);
            }
            break;
        }
        }
    }
}
 

Is it a bug in SFML? Or is my code wrong?

8

Feature requests / Re: Drawable and Transformable class

« on: January 16, 2014, 04:23:30 pm »

And how i can draw it?

win.draw(*((Drawable*)transformablePtr));

This is a very bad code, because i don't know whether transformablePtr is Drawable.

9

Feature requests / Drawable and Transformable class

« on: January 16, 2014, 04:07:20 pm »

I think all drawable and transformable things could have the same parent class.
For example:

namespace sf
{
class Object
: sf::Drawable, sf::Transformable
{
};

// and all drawable and transformable classes derives it
// for exmaple:
class Sprite
: sf::Object
{
//...
};
 

I came up with this idea when i written SFML and Box2d framework, when I needed to write method returning drawable object which i can set it position.