Messages

1

Graphics / Re: Do I really have to use std::vector<sf::CircleShape> ?

« on: July 17, 2018, 04:44:20 pm »

Thank you for your response!

I'm a bit confused. So what I need to do is make an empty texture and draw the circles on it?

Could you link a tutorial or an example, please. Thank you.

2

Graphics / Do I really have to use std::vector<sf::CircleShape> ?

« on: July 17, 2018, 03:53:53 pm »

Hello! Lets say I have collection of circles that I want to draw. They are identical in color, outline etc. Like shown in the picture above.

Let's say I store the positions and radiuses in vectors. I don't want to store every sf::CircleShape individually since that takes too much memory and makes the program slow.

Is there a way to make a single sf::CircleShape and use (tranform?) something to move and scale the circle with the vectors mentioned above? And is there a way to draw them with a single RenderTarget::draw() like with sf::VertexArray?

Responses are greatly appreciated.

3

General discussions / Do I really have to use std::vector<sf::CircleShape> ?

« on: July 17, 2018, 03:51:07 pm »

Hello! Lets say I have collection of circles that I want to draw. They are identical in color, outline etc. Like shown in the picture above.

Let's say I store the positions and radiuses in vectors. I don't want to store every sf::CircleShape individually since that takes too much memory and makes the program slow.

Is there a way to make a single sf::CircleShape and use (tranform?) something to move and scale the circle with the vectors mentioned above? And is there a way to draw them with a single RenderTarget::draw() like with sf::VertexArray?

Responses are greatly appreciated.

4

General / Transform problem

« on: June 29, 2018, 01:41:22 pm »

I am trying to make two copies of 'lines' where the other one is slightly moved in the X direction. Is there a way to directly change it or do I need to make another entity and use its position to change the transform...?

sf::RenderStates states;

states.transform *= getTransform();
window.draw(lines, states);

sf::CircleShape circle;   //I used circleshape just because idk
circle.setPosition(sf::Vector2f(300, 0));

states.transform *= circle.getTransform(); //how do I do this without another entity
window.draw(lines, states);
 

There must be way to do this so please let me know. I have tried to Google and searched the tutorials so please don't tell me to go look harder.

5

Graphics / Custom shapes with textures

« on: June 24, 2018, 11:57:23 am »

I want to make a custom shape that has two textures. What I learned from the tutorials is that I need to make a class that inherits from sf::Drawable and sf::Transformable, and then overload the draw function.

This was from the tutorial:

class MyEntity : public sf::Drawable, public sf::Transformable
{
public:

    // add functions to play with the entity's geometry / colors / texturing...

private:

    virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const
    {
        // apply the entity's transform -- combine it with the one that was passed by the caller
        states.transform *= getTransform(); // getTransform() is defined by sf::Transformable

        // apply the texture
        states.texture = &m_texture;

        // you may also override states.shader or states.blendMode if you want

        // draw the vertex array
        target.draw(m_vertices, states);
    }

    sf::VertexArray m_vertices;
    sf::Texture m_texture;
};
 

Could someone post a simple example with two rectangles or give me a better option, please. Thank you.