FLASHのお勉強　ーアクションスクリプトの実践的事始めー

(35) 拡大・スライド機能付きビューアー

pict_title.text = "御嶽山から北アルプス方面を望む";
//screen's x&y
var x0 = 50;
var y0 = 50;
//screen width & height
var ws = screen._width;
var hs = screen._height;
//transporting & zooming speed
var rate = 5;
//import photo
var pict_mc = createEmptyMovieClip("pict", 1);
var mcLoader:MovieClipLoader = new MovieClipLoader();
mcLoader.addListener(this);
mcLoader.loadClip("pict1.jpg", pict_mc);
function onLoadInit(pict_mc) {
  pict_mc._xscale = pict_mc._yscale=50;
  pict_mc._x = -150;
  pict_mc._y = -75;
  pict_mc.setMask(screen);
}
//imported photo size
var wp = 800;
var hp = 500;

z_in.onPress = function() {
  _root.onEnterFrame = function() {
     if (pict_mc._xscale<150) {
       pict_mc._xscale += rate;
       pict_mc._yscale += rate;
       pict_mc._x -= (x0+ws/2-pict_mc._x)*rate/pict_mc._xscale;
       pict_mc._y -= (y0+hs/2-pict_mc._y)*rate/pict_mc._yscale;
     }
   };
};
z_out.onPress = function() {
  _root.onEnterFrame = function() {
     if (pict_mc._xscale>25 && pict_mc._x<=x0) {
       pict_mc._xscale -= rate;
       pict_mc._yscale -= rate;
       pict_mc._x += (x0+ws/2-pict_mc._x)*rate/pict_mc._xscale;
       pict_mc._y += (y0+hs/2-pict_mc._y)*rate/pict_mc._yscale;
     }
   };
};
a_left.onPress = function() {
  _root.onEnterFrame = function() {
     if (pict_mc._x<=x0) {
       pict_mc._x += rate*2;
     }
  };
};
a_right.onPress = function() {
  _root.onEnterFrame = function() {
     if (pict_mc._x>=x0+ws-wp*pict_mc._xscale/50) {
       pict_mc._x -= rate*2;
     }
  };
};
a_up.onPress = function() {
  _root.onEnterFrame = function() {
     if (pict_mc._y<=y0) {
       pict_mc._y += rate*2;
     }
  };
};
a_down.onPress = function() {
  _root.onEnterFrame = function() {
     if (pict_mc._y>=y0+hs-hp*pict_mc._yscale/50) {
       pict_mc._y -= rate*2;
     }
  };
};
var mouselistner:Object = new Object();
mouselistner.onMouseUp = function() {
  _root.onEnterFrame = function() {
  };
};
Mouse.addListener(mouselistner);