Hi there,
I'm playing around with textured vertex array triangles and have some questions.
More specifically it's about keeping the same texture resolution independently of the zoom level and with my formula the resolution really stays the same (as intended), but the texture moves around strangely whenever I zoom in or out.
Is there an algorithm to prevent this from happening.
What I need is a solution, where the (endlessly repeated) texture moves with the view while zooming the view.
I know that I have to add an unknown number/calculation to my formula.........
Many thanks in advance for any help!
#include <SFML/Graphics.hpp>
int main()
{
sf::RenderWindow window(sf::VideoMode(1000,1000), "Map", sf::Style::Close);
sf::View view(sf::Vector2f(500, 500), sf::Vector2f(1000, 1000));
float zoomvariable = 1;
sf::Texture texture;
texture.loadFromFile("grass.png");
texture.setRepeated(true);
sf::VertexArray triangle(sf::Triangles, 3);
triangle[0].position = sf::Vector2f(0, 0);
triangle[1].position = sf::Vector2f(900, 0);
triangle[2].position = sf::Vector2f(600, 900);
triangle[0].texCoords = sf::Vector2f(triangle[0].position.x,triangle[0].position.y);
triangle[1].texCoords = sf::Vector2f(triangle[1].position.x,triangle[1].position.y);
triangle[2].texCoords = sf::Vector2f(triangle[2].position.x,triangle[2].position.y);
while (window.isOpen())
{
sf::Event event;
while (window.pollEvent(event))
{
switch (event.type)
{
case sf::Event::Closed:
window.close();
break;
case sf::Event::KeyPressed:
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Add))
{
zoomvariable=zoomvariable*0.9f;
triangle[0].texCoords = sf::Vector2f(triangle[0].position.x/zoomvariable,triangle[0].position.y/zoomvariable);
triangle[1].texCoords = sf::Vector2f(triangle[1].position.x/zoomvariable,triangle[1].position.y/zoomvariable);
triangle[2].texCoords = sf::Vector2f(triangle[2].position.x/zoomvariable,triangle[2].position.y/zoomvariable);
view.zoom(0.9f);
}
if(sf::Keyboard::isKeyPressed(sf::Keyboard::Subtract))
{
zoomvariable=zoomvariable*1.1f;
triangle[0].texCoords = sf::Vector2f(triangle[0].position.x/zoomvariable,triangle[0].position.y/zoomvariable);
triangle[1].texCoords = sf::Vector2f(triangle[1].position.x/zoomvariable,triangle[1].position.y/zoomvariable);
triangle[2].texCoords = sf::Vector2f(triangle[2].position.x/zoomvariable,triangle[2].position.y/zoomvariable);
view.zoom(1.1f);
}
}
}
window.clear();
window.setView(view);
window.draw(triangle,&texture);
window.display();
}
return 0;
}
