This function starts a world program in the initial state specified by init. Its behaviour is defined via the handler functions handlers. These handler functions allow you to define various program behaviours: rendering, mouse and keyboard events, timed events, when to shut down, etc. A world specification may not contain more than one to-draw or on-tick handlers. This function will return the last world state when the stop condition is satisfied (see stop-when) or when the canvas is closed.

Consumes a function and returns a handler that, when passed to big-bang, will inform the world program what to draw.

Consumes a function and returns a handler that, when passed to big-bang, will be called each program tick with the current world state.

Consumes a function and returns a handler that, when passed to big-bang, will be called every n program ticks with the current world state.

Consumes a function and returns a handler that, when passed to big-bang, will be called every time a key is pressed. The function is called with the current world state and a String representing the pressed key. For most keys, this is just the corresponding single character.

The special keys are:

• Backspace key: "backspace"

• Tab key: "tab"

• Enter key: "enter"

• Shift key: "shift"

• Control key: "control"

• Pause key: "pause"

• Escape key: "escape"

• Prior key: "prior"

• Next key: "next"

• End key: "end"

• Home key: "home"

• Left arrow: "left"

• Up arrow: "up"

• Right arrow: "right"

• Down arrow: "down"

• Print key: "print"

• Insert key: "insert"

• Delete key: "delete"

• Backspace key: "backspace"

• Num lock key: "numlock"

• Scroll key: "scroll"

Consumes a function and returns a handler that, when passed to big-bang, will be called on every sampled mouse movement. The function will receive the world state, the current x and y positions of the mouse, and a String representing a mouse event. Possible mouse events are:

• "button-down" signals that the computer user has pushed a mouse button down;

• "button-up" signals that the computer user has let go of a mouse button;

• "drag" signals that the computer user is dragging the mouse. A dragging event occurs when the mouse moves while a mouse button is pressed.

• "move" signals that the computer user has moved the mouse;

• "enter" signals that the computer user has moved the mouse into the canvas area; and

• "leave" signals that the computer user has moved the mouse out of the canvas area.

Consumes a function and returns a handler that, when passed to big-bang, will be called to determine if the world should stop running. If the function returns true, then no other handlers will be called. The big-bang function will return this last world state.

Tests if the input is of type WorldConfig.

Tests if two key events are equals to each other.