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doc/api.md
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# LoveDOS API
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## Modules
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### love
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##### love.getVersion()
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Returns the version of LoveDOS as a string.
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### love.system
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Provides access to information about the user's system.
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##### love.system.getOS()
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Returns the operating system which LoveDOS is running on.
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##### love.system.getMemUsage()
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Returns the amount of memory in kilobytes which is being used by LoveDOS. This
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includes the memory used by both the loaded assets and lua.
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### love.graphics
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Provides functions for drawing lines, shapes, text and images.
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##### love.graphics.getDimensions()
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Returns the width and height of the screen in pixels as two numbers.
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##### love.graphics.getWidth()
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Returns the width of the screen in pixels.
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##### love.graphics.getHeight()
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Returns the height of the screen in pixels.
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##### love.graphics.getBackgroundColor()
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Returns the currently set background color.
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##### love.graphics.setBackgroundColor([color])
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Sets the the background color used when `love.graphics.clear()` is called
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without any arguments. If no `color` argument is passed to the function then
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the background color is reset to the default.
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##### love.graphics.getColor()
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Returns the currently set color.
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##### love.graphics.setColor([color])
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Sets the the color used when drawing. If no `color` argument is passed to the
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function then the color is reset to the default.
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##### love.graphics.getBlendMode()
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Returns the currently set blend mode.
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##### love.graphics.setBlendMode([mode])
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Sets the current blend mode used by `love.graphics.draw()`. If no `mode`
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argument is passed then the blend mode is set to the default (`"normal"`).
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Mode | Description
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------------|------------------------------------------------------------------
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`"normal"` | Draws normally with transparency
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`"fast"` | Draws without transparency, this is the fastest blend mode
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`"and"` | Binary ANDs the source and destination pixels
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`"or"` | Binary ORs the source and destination pixels
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`"color"` | Draws opaque pixels using the `love.graphics.setColor()` color
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##### love.graphics.getFont()
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Returns the current font. Returns nil if the default font is being used.
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##### love.graphics.setFont([font])
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Sets the current font. If `font` is nil then the font is reset to the default.
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##### love.graphics.getCanvas()
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Returns the current canvas. Returns nil if the default canvas is being used.
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##### love.graphics.setCanvas([image])
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Sets the current canvas which all the draw operations will draw to. If the
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`image` argument is not set then the canvas is reset to the default canvas
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representing the user's screen.
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##### love.graphics.getFlip()
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Returns true if images are set to be horizontally flipped when drawn
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##### love.graphics.setFlip([enable])
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Set whether images should be horizontally flipped when draw. If `enable` is not
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passed then this is set to false by default.
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##### love.graphics.clear([color])
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Clears the screen (or canvas) to the `color`. If no `color` argument is given
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then the background color is used.
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##### love.graphics.draw(image [, quad], x, y)
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Draws the `image` to the screen at the given `x`, `y` position. If a `quad`
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argument is provided then the image is clipped to the provided quad when drawn.
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##### love.graphics.point(x, y)
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Draws a pixel.
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##### love.graphics.line(x, y, x2, y2 [, ...])
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Draws a line from the positition `x`, `y` to `x2`, `y2`. You can continue
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passing point positions to draw a polyline.
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##### love.graphics.rectangle(mode, x, y, width, height)
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Draws a rectange and the `x`, `y` position of the given `width` and `height`.
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`mode` should be either `"fill"` or `"line"`.
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##### love.graphics.circle(mode, x, y, radius)
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Draws a circle of a given `radius` with its center at the `x`, `y` position.
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`mode` should be either `"fill"` or `"line"`.
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##### love.graphics.print(text, x, y)
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Draws the `text` string in the current font with its top left at the `x`, `y`
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position.
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##### love.graphics.newImage(filename [, key])
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Creates and returns a new image. `filename` should be the name of an 8bit .pcx
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image file which uses the default VGA palette. The `key` value is the color in
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the image which is used to represent the transparent pixels; if no `key` is
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provided then the color 0 is used.
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##### love.graphics.newCanvas([width, height])
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Creates and returns a new blank image of the size `width`, `height`. If a
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`width` and `height` are not provided then the image will be the same
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dimensions as the screen.
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##### love.graphics.newQuad(x, y, width, height)
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Creates and returns a new quad.
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##### love.graphics.newFont(filename)
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Creates and returns a new font. `filename` should be the name of a black and
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white 8bit .pcx image file representing all 256 characters in a 16 x 16
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character grid.
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##### love.graphics.present()
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Flips the current screen buffer with the displayed screen buffer. This is
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called automatically after the `love.draw()` callback.
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### love.timer
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Provides an interface to your system's clock.
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##### love.timer.getDelta()
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Returns the time between the last two frames.
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##### love.timer.getAverageDelta()
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Returns the average delta time over the last second.
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##### love.timer.getFps()
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Returns the current frames per second
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##### love.timer.getTime()
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Returns the number of seconds since some time in the past. The value returned
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by this function should be used only as a comparison with other values returned
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by this function.
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##### love.timer.step()
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Measures the time between two frames. This is automatically called each frame.
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##### love.timer.sleep(seconds)
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Pauses the thread for the specified number of `seconds`. During this time no
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callbacks are called.
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### love.keyboard
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##### love.keyboard.isDown(code)
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Returns true if the key of the given scancode is currently down.
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## Objects
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### Image
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A loaded image or canvas which can be drawn.
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##### Image:getDimensions()
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Returns the width and height of the image in pixels as two numbers.
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##### Image:getWidth()
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Returns the width in pixels of the image.
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##### Image:getHeight()
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Returns the height in pixels of the image.
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##### Image:getPixel(x, y)
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Returns the color of the pixel at the position `x`, `y` of the image. If the
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position is outside of the image then 0 is returned.
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##### Image:setPixel(x, y)
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Sets the color of the pixel at the position `x`, `y` of the image. If the
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position is outside of the image then no change is made.
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##### Image:mapPixel(fn)
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Takes the function `fn` which is called for each pixel of the image and is
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given the arguments `x`, `y` and `color`: The position of the current pixel and
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its color. Each pixel will be set to the color returned by this function.
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### Quad
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A rectangle used to represent the clipping region of an image when drawing.
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##### Quad:setViewport(x, y, width, height)
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Sets the position and dimensions of the quad
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##### Quad:getViewport()
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Returns the position (`x`, `y`) and dimensions (`width`, `height`) of the quad,
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4 numerical values in total.
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### Font
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A font used by `love.graphics.print()`. The current font can be set using the
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`love.graphics.setFont()` function.
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##### Font:getDimensions(text)
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Returns the width and height in pixels which the provided `text` string would
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take to render.
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##### Font:getWidth([text])
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Returns the width in pixels which the provided `text` string would take to
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render. If no `text` argument is provided, the width of a single character is
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returned.
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##### Font:getHeight([text])
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Returns the height in pixels which the provided `text` string would take to
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render. If no `text` argument is provided, the height of a single line is
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returned.
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##### Font:setCharSpacing(n)
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Sets the size of the gap between each character of text in pixels to `n`.
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##### Font:setLineSpacing(n)
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Sets the size of the gap between each character of text in pixels to `n`.
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## Callbacks
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##### love.load()
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Called when LoveDOS is started.
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##### love.update(dt)
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Called at the beginning of each frame, `dt` is the amount of time in seconds
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which has passed since the last frame. This is where all the game logic should
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take place.
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##### love.draw()
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Called when the frame is ready to be drawn. All your draw calls should take
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place in this function.
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##### love.keypressed(code)
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Called when the user presses a key. `code` is the scancode value for the
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pressed key.
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##### love.keyreleased(code)
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Called when the user releases a key. `code` is the scancode value for the
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released key.
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doc/building.md
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# Building LoveDOS
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Although LoveDOS provides precompiled binaries on the [releases
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page](releases), you may still wish to build the project's source if you want
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to make changes to the project.
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## Requirements
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LoveDOS depends on the following being installed before building:
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* **[Python2.7](https://www.python.org/)** is required by build.py, the build
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script
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* **[DJGPP cross compiler](https://github.com/andrewwutw/build-djgpp)**
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is required to compile the source files
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## Building
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To compile you should clone the git repository or [download the .zip](#) of it.
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Once this is done you should open the build.py file in an editor and check to
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make sure the COMPILER variable is set to the correct command as to run DJGPP's
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gcc executable; change the COMPILER variable's value if it is not set to the
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correct value.
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Assuming the COMPILER variable is correctly set the script should be run:
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```
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./build.py
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```
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The script will output the following line when it starts:
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```
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compiling...
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```
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Within a minute the script should finish and display the following line:
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```
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done
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```
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There should now be a file named "love.exe" in the "bin/" directory
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doc/files.md
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# LoveDOS files
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A brief overview of each file and directory which makes up the LoveDOS source
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code.
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File | Description
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------------------|------------------------------------------------------------
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main.c | The entry point, initialises everything
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vga.c | Functions for initing / deiniting vga mode 13h
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luaobj.h | Helper function prototypes for lua udata objects
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luaobj.c | Helper functions for lua udata objects
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love.c | The core `love` module
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system.c | `love.system` module
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timer.c | `love.timer` module
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graphics.h | `love.graphics` prototype and typedefs
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graphics.c | `love.graphics` module
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keyboard.h | `love.keyboard` prototype and typedefs
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keyboard.c | `love.keyboard` module and keyboard interrupt handling
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image.h | `Image` object prototypes and typedefs
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image.c | `Image` object
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quad.h | `Quad` object prototypes and typedefs
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quad.c | `Quad` object
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font.h | `Font` object prototypes and typedefs
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font.c | `Font` object
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font\_embedded.c | The default embedded `Font`'s image data
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lib/ | Libraries
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