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Description
Draw with the mouse.
To clear, press Space.

I made something like this before, but this time I tried to make the code as short as possible. This was the shortest I could get it with a clear function:

/* Sketch Pad v1.0 */
_quality = "LOW";
paintbrush = _root.createEmptyMovieClip("pencil", 1, {_x:0, _y:0});
drawing = _root.createEmptyMovieClip("paper", 2, {_x:0, _y:0});
drawing.lineStyle(1,0x000000,100);
drawing.moveTo(_xmouse,_ymouse);
onMouseDown = function () {
down = true;
};
onMouseUp = function () {
down = false;
};
onEnterFrame = function () {
drawing.lineStyle(1,0x000000,100);
paintbrush._x = _xmouse;
paintbrush._y = _ymouse;
if (down) {
drawing.lineTo(paintbrush._x,paintbrush._y);
} else {
drawing.moveTo(paintbrush._x,paintbrush._y);
}
if (Key.isDown(Key.SPACE)) {
drawing.clear();
}
};

Enjoy.

Description
Draw with the mouse.
To clear, press Space.

I made something like this before, but this time I tried to make the code as short as possible. This was the shortest I could get it with a clear function:

/* Sketch Pad v1.0 */
_quality = "LOW";
paintbrush = _root.createEmptyMovieClip("pencil", 1, {_x:0, _y:0});
drawing = _root.createEmptyMovieClip("paper", 2, {_x:0, _y:0});
drawing.lineStyle(1,0x000000,100);
drawing.moveTo(_xmouse,_ymouse);
onMouseDown = function () {
down = true;
};
onMouseUp = function () {
down = false;
};
onEnterFrame = function () {
drawing.lineStyle(1,0x000000,100);
paintbrush._x = _xmouse;
paintbrush._y = _ymouse;
if (down) {
drawing.lineTo(paintbrush._x,paintbrush._y);
} else {
drawing.moveTo(paintbrush._x,paintbrush._y);
}
if (Key.isDown(Key.SPACE)) {
drawing.clear();
}
};

Enjoy.