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General / VertexArray, tilemap and mouse on tile

« on: August 27, 2019, 05:29:49 pm »

Hello
I have a problem with checking which tile the mouse is on. I found one solution which is already implemented, but makes a huge drop down of fps ammount. I just make an adtional VertexArray and use "contains" method. Could u tell me maybe another way to do this?

I have VertexArray of 2304 elements which makes 576 tiles.
The structure is:


Code:

(click to show/hide)

                sf::Vector2i mouse = sf::Mouse::getPosition(window);
                sf::Vector2f mouse_world = window.mapPixelToCoords(mouse);
                sf::VertexArray testmouse;
                testmouse.setPrimitiveType(sf::Quads);
                testmouse.resize(4);

                //"Already implemented method"
                for (int i = 0; i < G1.getVertexNumber(); i += 4)
                {
                        testmouse.append(G1.getVA()[i]);
                        testmouse.append(G1.getVA()[i + 1]);
                        testmouse.append(G1.getVA()[i + 2]);
                        testmouse.append(G1.getVA()[i + 3]);
                        if (testmouse.getBounds().contains(mouse_world))
                        {
                                cout << i / 4 << "contains mouse" << endl;
                        }
                        testmouse.clear();
                }

                window.draw(G1.getVA());
                window.display();

 

And code of LoadTileMap function (i know it's not best and probably could be in one loop )

(click to show/hide)

        std::vector<Tile> env;
        sf::VertexArray tiles;


bool Game::LoadTileMap(double SCR_WIDTH, double SCR_HEIGHT)
{
        float size = 60;
        int ytiles = (int)SCR_HEIGHT / (int)size;
        int xtiles = (int)SCR_WIDTH / (int)size;
        int tilesnum = ytiles * xtiles;
       
        for (int i = 0; i <= ytiles; i++)
        {
                for (int j = 0; j < xtiles; j++)
                {
                        sf::Vector2f vec0 = sf::Vector2f(0 + (j * size), 0+(i*size));
                        sf::Vector2f vec1 = sf::Vector2f(size + (size * j), 0 + (i * size));
                        sf::Vector2f vec2 = sf::Vector2f(size + (j*size), size + (i*size));
                        sf::Vector2f vec3 = sf::Vector2f(0 + (j*size), size+(i*size));
                        Tile tile(size, vec0, vec1, vec2, vec3);
                        env.push_back(tile);
                }
        }
                tiles.setPrimitiveType(sf::Quads);
                tiles.resize(tilesnum * 4);
                sf::Vector2f v0;
                sf::Vector2f v1;
                sf::Vector2f v2;
                sf::Vector2f v3;
                std::cout << tilesnum << std::endl;
                int numofvertex = 0;
                for (int i = 0, j=0; i < tilesnum; i++, j+=4)
                {
                        sf::Vector2f v0 = env.at(i).getVec0();
                        sf::Vector2f v1 = env.at(i).getVec1();
                        sf::Vector2f v2 = env.at(i).getVec2();
                        sf::Vector2f v3 = env.at(i).getVec3();
                        sf::Color newcolor = env.at(i).getColor();
                        tiles[j].position = v0;
                        tiles[j + 1].position = v1;
                        tiles[j + 2].position = v2;
                        tiles[j + 3].position = v3;

                        tiles[j].color = newcolor;
                        tiles[j + 1].color = newcolor;
                        tiles[j + 2].color = newcolor;
                        tiles[j+3].color = newcolor;

                        numofvertex += 4;

                }
                vertexnumber = numofvertex;
                std::cout << "numofvertex: " << numofvertex << std::endl;
                std::cout << "ntiles: " << tilesnum << std::endl;

        return true;
}

@edit
Okey, i got an idea:

                sf::Vector2i mouse = sf::Mouse::getPosition(window);
                sf::Vector2f mouse_world = window.mapPixelToCoords(mouse);
                cout << int(mouse_world.x / 60) << " " << int(mouse_world.y / 60)<<  endl;
 

Dividing position by tilesize. But i dont know how to use this information to get to the proper tile and change for example its color.