Zooming mechanics on a 2D surface

[steep sigil]

So I have a Vertex Array which contains the position and colour for all points in my simulation, Each is a pixel in size. I would like to add zooming to this simulation however I am very uneducated with zooming mechanics.

First of all how can you zoom out on something which is one pixel in size? do you only show it if there are n objects in that pixel?

Second of all, what zooming method should I use? Preferably one with smooth zooms in and out.

Lastly, How does zooming work with these Arrays of vertices?

[mystic ridge]

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[low grove]

well, what would you like to happen exactly?

[steep sigil]

when you zoom out, things get smaller. like zooming out with google earth, so the pixels would be projected closer together. and the opposite for zooming out. I guess I would like this to read from a vertex array with the default scale and create another resized it appropriately however that may not be so efficient but its a start.
does this explain it well?

[low grove]

how do you place your vertices?

[steep sigil]

vertex_list = [0, 0, 10, 10, 20, 20, 30, 30, 40, 40, 50, 50, 60, 60, 70, 70, 80, 80, 90, 90, 100, 100]

this is a sf::vertex_array object from SFML and if drew will show a line of points from 0, 0 to100, 100 because each coordinate in the list is seen as: [x0, y0, x1, y1, x2, y2, . . .]

[low grove]

well, all you need to do is to apply a scaling transform

no sure how you draw this thing exactly in sfml

[steep sigil]

sf::RenderWindow window(sf::VideoMode(screen_width, screen_height), "Galaxy simulation");

window.draw(vertex_array, sf::BlendAdd);

[low grove]

can you specify a transform for the draw?

looks like you can via the render states

[steep sigil]

i found sf::Transform::scale

[mystic ridge]

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