一个模仿Acdsee浏览图片的效果

//----------------------------------------------------------------------------------------------------------
Stage.showMenu = false;
Stage.scaleMode = "noScale";
fscommand(allowscale, true);
mapScale = map_mc._xscale;
stageL = 0;
stageT = 0;
stageR = map_mc._width;
stageB = map_mc._height;
stageW = mask_mc._width;
stageH = mask_mc._height;
maxZoom = 800;
minZoom = 50;
initMapZoom();
actionLabel = "放大";
_root.onLoad = function() {
var btnName = new Array();
btnName = Array("放大", "缩小", "全图", "加大", "减小", "移动");
btnNameLen = btnName.length;
for (i=1; i<btnNameLen; i++) {
ctrlbtn0.duplicateMovieClip("ctrlbtn"+i, i);
}
for (i=0; i<btnNameLen; i++) {
ctrlbtns = eval("ctrlbtn"+i);
ctrlbtns.btn_name.text = btnName[i];
ctrlbtns._x = i*(ctrlbtn0._width+5)+10;
ctrlbtns._y = ctrlbtn0._y;
ctrlbtns.vars = btnName[i];
ctrlbtns.onRollOver = function() {
this._alpha = 60;
};
ctrlbtns.onRollOut = function() {
this._alpha = 100;
};
ctrlbtns.onRelease = function() {
actionLabel = this.vars;
if (this.vars == "全图") {
initMapZoom();
}
if (this.vars == "加大") {
var mapx = ((stageL+stageR)/2-map_mc._x)/mapScale;
var mapy = ((stageT+stageB)/2-map_mc._y)/mapScale;
if (mapScale*1.2<maxZoom) {
mapZoom(mapScale*1.2, mapx, mapy);
} else {
mapZoom(maxZoom, mapx, mapy);
}
}
if (this.vars == "减小") {
var mapx = ((stageL+stageR)/2-map_mc._x)/mapScale;
var mapy = ((stageT+stageB)/2-map_mc._y)/mapScale;
if (mapScale*.8>minZoom) {
mapZoom(mapScale*.8, mapx, mapy);
} else {
mapZoom(minZoom, mapx, mapy);
}
}
};
}
};
function initMapZoom() {
var msW = map_mc._width/stageW;
var msH = map_mc._height/stageH;
var mapBi = (msW<msH) ? msW : msH;
map_mc._x = stageL;
map_mc._y = stageT;
mapScale = mapScale/mapBi;
map_mc._xscale = mapScale;
map_mc._yscale = mapScale;
}
var mouseObj = new Object();
Mouse.addListener(mouseObj);
mouseObj.onMouseDown = function() {
if (_xmouse>stageL && _xmouse<stageR && _ymouse>stageT && _ymouse<stageB) {
if (actionLabel == "放大" || actionLabel == "缩小") {
box_x = _xmouse;
box_y = _ymouse;
createEmptyMovieClip("box_mc", btnNameLen+1);
with (box_mc) {
lineStyle(1, 0xff0000, 80);
moveTo(0, 0);
lineTo(0, 1000);
lineTo(1000, 1000);
lineTo(1000, 0);
lineTo(0, 0);
_width = 1;
_height = 1;
}
mapW = map_mc._width;
mapH = map_mc._height;
box_mc.onEnterFrame = function() {
this._width = Math.abs(_xmouse-box_x);
this._height = Math.abs(_ymouse-box_y);
this._x = _xmouse<box_x ? _xmouse : box_x;
this._y = _ymouse<box_y ? _ymouse : box_y;
};
}
if (actionLabel == "移动") {
left = stageR-map_mc._width;
top = stageB-map_mc._height;
right = 0;
bottom = 0;
map_mc.startDrag(false, left, top, right, bottom);
}
}
};
mouseObj.onMouseUp = function() {
if (box_mc != undefined) {
boxW = box_mc._width+box_mc._x>stageR ? stageR-box_mc._x : box_mc._width;
boxH = box_mc._height+box_mc._y>stageB ? stageB-box_mc._y : box_mc._height;
mouseX = box_mc._width != 0 ? box_mc._x : _xmouse;
mouseY = box_mc._height != 0 ? box_mc._y : _ymouse;
if (actionLabel == "放大") {
large();
}
if (actionLabel == "缩小") {
small();
}
box_mc.removeMovieClip();
}
if (actionLabel == "移动") {
map_mc.stopDrag();
}
};
function large() {
_l1 = boxW == 0 ? 1.2 : stageR/boxW;
_l2 = boxH == 0 ? 1.2 : stageB/boxH;
point = _l1<_l2 ? _l1 : _l2;
var mapx = ((mouseX+_xmouse)/2-map_mc._x)/mapScale;
var mapy = ((mouseY+_ymouse)/2-map_mc._y)/mapScale;
if (map_mc._xscale<maxZoom) {
if (mapScale*point<maxZoom) {
mapZoom(mapScale*point, mapx, mapy);
} else {
mapZoom(maxZoom, mapx, mapy);
}
}
}
function small() {
_l1 = boxW == 0 ? 0.8 : boxW/stageR;
_l2 = boxH == 0 ? 0.8 : boxH/stageB;
point = _l1>_l2 ? _l1 : _l2;
var mapx = (_xmouse-map_mc._x)/mapScale;
var mapy = (_ymouse-map_mc._y)/mapScale;
if (map_mc._xscale>minZoom) {
if (mapScale*point>minZoom) {
mapZoom(mapScale*point, mapx, mapy);
} else {
mapZoom(minZoom, mapx, mapy);
}
}
}
function mapZoom(map_scale, map_x, map_y) {
map_mc._xscale = map_scale;
map_mc._yscale = map_scale;
mapScale = map_scale;
map_mc._x = (stageL+stageR)/2-map_x*mapScale;
map_mc._y = (stageT+stageB)/2-map_y*mapScale;
//---------------------------------------------------
map_mc._x = map_mc._x+map_mc._width<stageR ? stageR-map_mc._width : map_mc._x;
map_mc._x = map_mc._x>0 ? 0 : map_mc._x;
map_mc._y = map_mc._y+map_mc._height<stageB ? stageB-map_mc._height : map_mc._y;
map_mc._y = map_mc._y>0 ? 0 : map_mc._y;
}