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 Tutorials » Games
Step 1: Letting the user drawFirst thing's first. Make a new Flash document and call it drawing AI. Then, type the following code in the actions panel.stop()
lines = {}
_root.createEmptyMovieClip("pen", 10)
pen.lineStyle(1, 000000, 100)
This code simply stops the move and creates an object called lines. Then, it creates a movie clip called pen and sets it up so it can draw with the lineStyle method. Now, let's look at the code that lets you draw._root.onMouseDown = function(){
drawing = true
pen.moveTo(_xmouse, _ymouse)
segments += 1
name = "line"+segments
lines[name] = ["break", _xmouse, _ymouse]
}
_root.onMouseMove = function(){
if(drawing==true){
pen.lineTo(_xmouse, _ymouse)
segments += 1
name = "line"+segments
lines[name] = [_xmouse, _ymouse]
}
}
_root.onMouseUp = function(){
drawing = false
}
This is alot of code, but it's pretty simple. It makes it so that when you click the movie, drawing is set to true ans then pen moves to the mouse's x and y positions. Then it adds one to the segments variable, and creates an array in the lines object, containing the string "break", the x position of the mouse, and the y position of the mouse. This code makes sure that when the drawing is being re-drawn by the computer, it knows to take a break so it can move to the new position, instead of constantly drawing lines. Then, if the mouse is moving, the game checks to see if drawing is true. If it is, the pen movie clip draws a line to the mouse, and adds one to the segments variable. We then create an array in lines containing the mouse's position, but we do not include "break" so the computer knows we are only drawing a line. Finally, when the mouse is released, drawing is set to false. Now, create a movie clip with a red circle and a black text field saying "ok". Put this in the first frame and type the following code into the actions panel for the ok movie clip.on(press){
_root.gotoAndStop(6)
}
What this code does is it simply sends the root timeline to the sixth frame when the movie clip is pressed.
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Keeping track of dynamically drawn lines
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