How to Think Like a Computer Scientist: Learning with Python 2nd Edition/GASP

Graphics API for Students of Python: GASP Introduction Describe gasp here... Coordinates (0, 0) is at the bottom left of the window. The window is 640 pixels by 480, by default. (You can make it a different size if you want to.) Coordinates are given in units of one pixel. All functions that take coordinates take them as a tuple (x, y). Colors To access the color module GASP has to offer. Call color.* where * is the color you wish to call. For example: ` color.BLACK ` This is the color black. Check out the gasp color reference chart to see all of the available color options. The Essentials These are the essentials. ` from gasp import * ` imports the gasp module, begin_graphics() starts the graphics window, and end_graphics() quits the graphics window and ends the program. It's dead simple, but also dead necessary. Graphics Functions begin_graphics() This creates a graphics window with the dimensions 800x600, a title of My Game , and a background color of yellow. With no arguments you get a white 640x480 graphics window titled Gasp . width The width of the window in pixels. height The windows height in pixels. title A string that will be the title of the window. background It is the background of the graphics window. It can either be a color or an image end_graphics() Ends a graphics window. clear_screen() Clears everything off of the graphics window. It looks like a new graphcs window as if you just called begin_graphics(). remove_from_screen() removes those objects from the screen obj A screen object of a list of screen_objects you would like to remove from the screen Screen Objects The objects that you will be displayed in your graphics window. You can manipulate these objects using the screen object methods Plot It puts a dot on the screen. pos The coordinate on the screen that you wish to plot. color The color you wish the dot to be. size An integer that determines the size the of the dot Line Creates a line on the screen. start The starting coordinate of the line. end The coordinate at which the line will end. color The color of the line Box This creates a Box on the screen center A coordinate where the center of your box will be. width The width in pixels of the box. height The height of the box in pixels. filled A boolean value that determines if your box will be filled color The color of your box. thickness The thickness in pixels of your box's lines. Polygon Creates a polygon on the screen points A list of coordinates that is each point on the polygon. The must be more than two items in the list filled A boolean value. If it is False the polygon will not be filled. Else, the polygon will not be filled color The color of the polygon's lines thickness An integer that determines the thickness of the lines. Circle Draws a circle, its center is a set of coordinates, and the radius is in pixels. It defaults to not being filled and the color black. center The circle's center coordinate. width An integer that is the radius of the circle filled A boolean value that determines if your circle will be filled color The color of your circle. thickness The thickness in pixels of the circles lines. Arc Creates an arc on the screen. center A coordinate that is the center of the arc. radius An integer that is the distance between the center and the outer edge of the arc. start_angle The start angle in degrees of the arc end_angle The end angle in degrees of your arc filled A boolean value that if True it fills the arc color The color the arc thickness The thickness in pixels of the arc Oval Puts an oval on the screen wherever you want. center The center coordinate of the Oval width The width in pixels of the oval height The height of the oval in pixels filled A boolean value determining if the oval will be filles or not. color The oval's color thickness The thickness of the ovals lines Image Loads an image onto the screen. If you only pass a width and not a height it automatically scales the height to fit the width you passed it. It behaves likewise when you pass just a height. file_path The path to the image center The center coordinates of the image width The width of the image in pixels. If width equals None then it defaults to the image file's width height The height of the image in pixels. If no height is passed it defaults to the image file's height Screen Object Methods The methods that manipulates screen objects move_to() Move a screen object to a pos obj A screen object you wish to move. pos The coordinate on the screen that the object will move to move_by() Move a screen object relative to it's position obj The screen object you wish to move dx How much the object will move in the 'x' direction. Positive or negative. dy How much the object will move in the 'y' direction. A pixel value. rotate_to() Rotate an object to an angle obj The screen object that will be rotated angle The angle in degrees that the object will be rotated to rotate_by() Rotate an object a certain degree. obj The screen object you wish to rotate angle The degree that the object will be rotate. Can be positive or negative. Text Text() Puts text on the screen text A string of the text that will be displayed pos The center coordinate of the text color The color of the text size The font size Mouse mouse_position() Returns the current mouse coordinate mouse_buttons() returns a dictionary of the buttons state. There is a 'left', 'middle', and 'right' key. Keyboard keys_pressed() returns a list of all of the keys pressed at that moment. Gasp Tools screen_shot Saves a screenshot of the current graphics screen to a png file. filename The file path relative to the current directory that the image will be written to.