Flash AS3 Mouse Drawing __flash

In this paper, 5 kinds of drawing methods of curve, straight line, circle, ellipse and rectangle are depicted by AS3, hoping to bring help to everyone.

(1): Curve

Knowledge Points:
1, add mouse Monitor event mouseevent;
2, the provision of the canvas size;
3, MoveTo and LineTo;
4, draw the beginning and end judgment.

Code:

var huabu:sprite=new Sprite (); 
Huabu.graphics.beginFill (0xFFFFFF); 
Huabu.graphics.drawRect (20,20,510,360); 
Huabu.graphics.endFill (); 
AddChild (Huabu); 
var _drawing:boolean; 
var quxian:sprite=new Sprite (); 
Quxian.graphics.lineStyle (2, 0xff0000); 
Huabu.addchild (Quxian); 
_drawing = false; 
Huabu.addeventlistener (Mouseevent.mouse_down, startdrawing); 
Huabu.addeventlistener (mouseevent.mouse_move,moving); 
Huabu.addeventlistener (mouseevent.mouse_up, stopdrawing); 
Stage.addeventlistener (mouseevent.mouse_up,stopdrawing); 
function startdrawing (event:mouseevent): void { 
quxian.graphics.moveTo (mousex, mousey); 
_drawing = true; 
} 
function Moving (event:mouseevent): void { 
if (_drawing) { 
  quxian.graphics.lineTo (mousex, Mousey); 
} 
} 
function stopdrawing (event:mouseevent): void { 
_drawing = false; 
}

(2): Straight line

Knowledge Points:
1, add mouse Monitor event mouseevent;
2, the provision of the canvas size;
3, MoveTo and LineTo;
4, draw the beginning and end judgment.
Difficulties:
Draw more than one line

Code:

var huabu:sprite=new Sprite (); 
Huabu.graphics.beginFill (0xFFFFFF); 
Huabu.graphics.drawRect (20,20,510,360); 
Huabu.graphics.endFill (); 
AddChild (Huabu); 
var _drawing:boolean=false; 
var zhixian:sprite=new Sprite (); 
Huabu.addchild (Zhixian); 
var _color:number=0xff0000; 
var zx:int=1; 
var Ys_x:number; 
var Ys_y:number; 
Huabu.addeventlistener (Mouseevent.mouse_down, startdrawing); 
Huabu.addeventlistener (mouseevent.mouse_move,moving); 
Huabu.addeventlistener (mouseevent.mouse_up, stopdrawing); 
Stage.addeventlistener (mouseevent.mouse_up, stopdrawing); 
function startdrawing (event:mouseevent): void {ys_x=mousex; 
Ys_y=mousey; 
_drawing = true; 
  } function Moving (event:mouseevent): void {if (_drawing) {huabu.removechild (Zhixian); 
  Zhixian=new Sprite (); 
  Zhixian.graphics.lineStyle (ZX, _color); 
  Zhixian.graphics.moveTo (ys_x,ys_y); 
  Zhixian.graphics.lineTo (Mousex,mousey); 
Huabu.addchild (Zhixian); }} function Stopdrawing (event:mouseevent): void {zhixian=New Sprite (); 
Huabu.addchild (Zhixian); 
No more than two sentences, can only draw a line _drawing = false;
 }

(3): Round

Knowledge Points:
1, add mouse Monitor event mouseevent;
2, the display radius (two points between the distance point.distance (coordinates 1, coordinates 2));
3, Drawcircle, MoveTo and LineTo;
4, draw the beginning and end judgment.
Difficulties:
Draw multiple Circles

Code:

var _drawing:boolean; 
var yuan:sprite=new Sprite (); 
AddChild (yuan); 
var banjing:sprite=new Sprite (); 
AddChild (banjing); 
var Yuanxin_x:number; 
var Yuanxin_y:number; 
var zuobiao1:point; 
var zuobiao2:point; 
var Bj:number; 
_drawing = false; 
Stage.addeventlistener (Mouseevent.mouse_down, startdrawing); 
Stage.addeventlistener (Mouseevent.mouse_move,yd); 
Stage.addeventlistener (mouseevent.mouse_up, stopdrawing); 
function startdrawing (event:mouseevent): void {yuanxin_x=mousex;//mouse position is the position of the center of the circle Yuanxin_y=mousey; 
_drawing = true; 
  } function yd (event:mouseevent): void {if (_drawing) {zuobiao1 = new point (yuanxin_x,yuanxin_y); 
  Zuobiao2 = new Point (MouseX, mousey); 
  bj= point.distance (Zuobiao1, ZUOBIAO2);//show the distance between two points is the radius removechild (yuan); 
  Yuan=new Sprite (); 
  Yuan.graphics.lineStyle (2, 0xff0000); 
  Yuan.graphics.drawCircle (YUANXIN_X,YUANXIN_Y,BJ); 
  AddChild (yuan); 
  RemoveChild (banjing); 
  Banjing=new Sprite (); Banjing.graphics.lineStyle (2,0xff0000,0.5); 
  Banjing.graphics.moveTo (yuanxin_x,yuanxin_y); 
  Banjing.graphics.lineTo (Mousex,mousey); 
AddChild (banjing); } function Stopdrawing (event:mouseevent): void {removechild (banjing);//The RADIUS line disappears at the end of painting banjing=new Sprite (); 
Radius addChild (banjing); 
  
Yuan=new Sprite ()//can draw multiple round addChild (yuan); 
_drawing = false; }

(4): Oval

Knowledge Points:
1, add mouse Monitor event MouseEvent and keyboard monitoring event keyboardevent;
2, the width and height of the ellipse;
3, DrawEllipse;
4, draw the beginning and end judgment;
5. Press the SHIFT key to draw the positive circle.
Difficulties:
Press the SHIFT key to draw a positive circle

Code:

var _drawing:boolean=false; 
var ellipse:sprite=new Sprite (); 
AddChild (ellipse); 
var Kaishi_x:number; 
var Kaishi_y:number; 
var W:number; 
var H:number; 
var _max:number; 
Stage.addeventlistener (Mouseevent.mouse_down, startdrawing); 
Stage.addeventlistener (mouseevent.mouse_move,moving); 
Stage.addeventlistener (mouseevent.mouse_up, stopdrawing); 
function startdrawing (event:mouseevent): void {kaishi_x=mousex; 
Kaishi_y=mousey; 
_drawing = true; 
  } function Moving (event:mouseevent): void {if (_drawing) {w=mousex-kaishi_x; 
  h=mousey-kaishi_y; 
  RemoveChild (ellipse); 
  Ellipse=new Sprite (); 
  Ellipse.graphics.lineStyle (2, 0xff0000); 
  Ellipse.graphics.drawEllipse (KAISHI_X,KAISHI_Y,W,H); 
AddChild (ellipse); 
} function Stopdrawing (event:mouseevent): void {ellipse=new Sprite (); 
AddChild (ellipse); 
_drawing = false; 
} stage.focus=this; 
Stage.addeventlistener (Keyboardevent.key_down, shift); function Shift (Event:keyboardevent): void {if (event.charcode==0) {if (_drawing) {w=mousex-kaishi_x; 
   h=mousey-kaishi_y; 
   _max=math.max (Math.Abs (w), Math.Abs (h)); 
    if (w<0 && h<0) {W=-_max; 
   H=-_max; 
    } if (w>0 && h>0) {W=_max; 
   H=_max; 
    } if (w<0 && h>0) {W=-_max; 
   H=_max; 
    } if (w>0 && h<0) {W=_max; 
   H=-_max; 
   } removechild (ellipse); 
   Ellipse=new Sprite (); 
   Ellipse.graphics.lineStyle (2, 0xff0000); 
   Ellipse.graphics.drawEllipse (KAISHI_X,KAISHI_Y,W,H); 
  AddChild (ellipse); } 
} 
}

(5): Rectangular

Knowledge Points:
1, add mouse Monitor event MouseEvent and keyboard monitoring event keyboardevent;
2, the width and height of the ellipse;
3, DrawRect;
4, draw the beginning and end judgment;
5, press the SHIFT key to draw the square.
Difficulties:
Press the SHIFT key to draw the square

Code:

var _drawing:boolean=false; 
var _drawrect:sprite=new Sprite (); 
AddChild (_drawrect); 
var Yx_x:number; 
var Yx_y:number; 
var W:number; 
var H:number; 
var _max:number; 
Stage.addeventlistener (Mouseevent.mouse_down, startdrawing); 
Stage.addeventlistener (mouseevent.mouse_move,moving); 
Stage.addeventlistener (mouseevent.mouse_up, stopdrawing); 
function startdrawing (event:mouseevent): void {yx_x=mousex; 
Yx_y=mousey; 
_drawing = true; 
  } function Moving (event:mouseevent): void {if (_drawing) {w=mousex-yx_x; 
  h=mousey-yx_y; 
  RemoveChild (_drawrect); 
  _drawrect=new Sprite (); 
  _drawrect.graphics.linestyle (2, 0xff0000); 
  _drawrect.graphics.drawrect (YX_X,YX_Y,W,H); 
AddChild (_drawrect); 
} function Stopdrawing (event:mouseevent): void {_drawrect=new Sprite (); 
AddChild (_drawrect); 
_drawing = false; 
} stage.focus=this; 
Stage.addeventlistener (Keyboardevent.key_down, shift); function Shift (Event:keyboardevent): void {if (event.charcode==0) {if (_draWing) {_max=math.max (Math.Abs (w), Math.Abs (h)); 
    if (w<0 && h<0) {W=-_max; 
   H=-_max; 
    } if (w>0 && h>0) {W=_max; 
   H=_max; 
    } if (w<0 && h>0) {W=-_max; 
   H=_max; 
    } if (w>0 && h<0) {W=_max; 
   H=-_max; 
   } removechild (_drawrect); 
   _drawrect=new Sprite (); 
   _drawrect.graphics.linestyle (2, 0xff0000); 
   _drawrect.graphics.drawrect (YX_X,YX_Y,W,H); 
  AddChild (_drawrect); } 
} 
}

Original address: http://www.68design.net/Web-Guide/Flash/53258-1.html