forked from: flash on 2010-4-13
/**
* Copyright misinoe ( http://wonderfl.net/user/misinoe )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/swN4
*/
// forked from kihon's flash on 2010-4-13
package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.geom.Point;
public class Main extends Sprite
{
private var bd:BitmapData;
private var brush:BitmapData;
private var prev:Point = new Point();
public function Main()
{
bd = new BitmapData(stage.stageWidth, stage.stageHeight, false);
addChild(new Bitmap(bd));
var circle:Sprite = new Sprite();
circle.graphics.beginFill(0x0,0.025); // 重ねるため、半透明にしました
circle.graphics.drawCircle(3, 3, 3);
circle.graphics.endFill();
brush = new BitmapData(6, 6, true, 0x0);
brush.draw(circle);
stage.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
}
private function onMouseDown(event:MouseEvent):void
{
prev.x = mouseX;
prev.y = mouseY;
stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
}
private function onMouseMove(event:MouseEvent):void
{
var dis:Number = Math.sqrt( Math.pow( mouseX-prev.x,2)+Math.pow(mouseY-prev.y,2 ) ) * 10; // 距離を計算して10分の1ピクセルずつ塗っていくようにしました
var tx:Number = (mouseX - prev.x) / dis;
var ty:Number = (mouseY - prev.y) / dis;
for (var i:int = 0; i < dis; i++)
{
bd.copyPixels(brush, brush.rect, new Point(prev.x - brush.width / 2, prev.y - brush.height / 2));
prev.x += tx;
prev.y += ty;
};
event.updateAfterEvent(); // マウスが動く毎に再描画するようにしました
}
private function onMouseUp(event:MouseEvent):void
{
stage.removeEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
}
}
}