when i control the role to shoot the bullets ,i occured a problem that the sprite buffer was not enough ,i can increase the buffer size ,but i think it will cost to much memory?
so i try to detect the bullet ,when it goes out the screen ,the game will delete it
but i found two ways to get screen size is gui.get_height() and render.get_height(),and the width ,too
there is a error says this two function only call by the GUI instance and render.
is there any other way i did not find out to do this?
Sure, the memory will increase, but not by much. I wouldn’t worry about that.
BUT you shouldn’t just leave a lot of stray bullets far off screen. It’s much better to delete them. When it comes to detecting when something goes off screen I suppose you have a couple of different options:
Use tonumber(sys.get_config("display.width")) and tonumber(sys.get_config("display.height")) to get the width and height as defined in game.project
Use render.get_window_width() and render.get_window_height() to get the current window width and height (in case the window has been resized). As you’ve already seen, these functions can only be called from a render script. For that you need a custom render script that you can modify. Once you’ve read these values from your render script you can store them in a Lua module or possibly in a global variable and access those values from your scripts.
Add collision objects (triggers) outside of the screen and detect collisions with them.
I’m trying to draw the screen bounds to the go, to make sure I know they’re accurate. It works initially, but as soon as the window is resized the bounds get out of whack.
I’m using render.get_window_width() and render. get_window_height() and msg.post("@render:", “draw_line”) to draw the lines.
Is there a way to accurately detect the screen bounds from a game object script, if the game dimensions have changed?
Thanks! I now have the dimension set in project settings and the actual screen dimensions. With stretch_projection it works fine, but I use fixed_fit_projection (to keep the gameworld from stretching).
How can I calculate the screen corners from the perspective of the gameworld when using fixed_fit_projection? Please see where I’m at currently.
Not stretched (cross covers the entire area perfectly):
