Automatic camera zoom

[rm-code]

We already have the min and max X and Y coordinates of the graph at our disposal. By using them we could compare the width / height of the graph to the dimensions of the LÖVE window. If the graph's rectangle gets too big the camera zoom can be calculated as:

screenW / graphW and screenH / graphH

We just need the smaller value since zooming is always using the same value for x and y scaling. I played around with some code, but this isn't working correctly atm (the zoom isn't working correctly once the graph gets too big):

    local function calculateZoom(zoom, dt)
        local w, h = (maxX * zoom - minX * zoom), (maxY * zoom - minY * zoom);
        local sw, sh = love.graphics.getDimensions();

        -- Automatic Zoom.
        local ratioW, ratioH =  sw / w, sh / h;
        zoom = ratioW <= ratioH and ratioW or ratioH;

        -- Clamp value and return it.
        return math.max(CAMERA_MAX_ZOOM, math.min(zoom, CAMERA_MIN_ZOOM));
    end

I am taking the "current" camera zoom into account since we need to check if the "scaled" version of the graph fits the screen.