如何縮小你的團隊,以適應在舞臺上,即使該組變寬
下圖爲啓動「藍」組 - 不擴大,不進行縮放。
該圖顯示它已經擴大超出階段之後並縮放背面的藍色組。
以下是如何縮小你的團隊沒有它「浮動」左:
- 撤消以前的任何組偏移(以往任何比例因子的量)。
- 計算新的比例因子(例如:縮小比例)。
- 保存新的比例因子以用於任何未來的比例縮放。
- 根據新的比例因子計算新的組偏移量。
- 將組的偏移量設置爲新縮放的偏移量。
- 重繪圖層。
您需要添加幾個屬性drawingGroup有關縮放:
// the current SCALED offset
drawingGroup.offsetX=0;
drawingGroup.offsetY=0;
// the point from which all scaling will occur
drawingGroup.scalePtX=0;
drawingGroup.scalePtY=0;
// the amount of current scaling applied to the group
// ==1.00 is the beginning un-scaled group
// >1.00 scales the group larger
// <1.00 scales the group smaller
drawingGroup.scaleFactor=1.00;
再加入此方法drawingGroup真正做到縮放:
drawingGroup.scaleBy=function(scaleChange){
// undo previous offset
this.offsetX += this.scalePtX/this.scaleFactor;
this.offsetY += this.scalePtY/this.scaleFactor;
// calc new scaling factor
var newScaleFactor = this.scaleFactor*(1+scaleChange);
// create new offset
this.offsetX -= this.scalePtX/newScaleFactor;
this.offsetY -= this.scalePtY/newScaleFactor;
// set new scale factor
this.scaleFactor=newScaleFactor;
// do the new offset
this.setOffset(this.offsetX,this.offsetY);
// do the new scale
this.setScale(this.scaleFactor);
layer.draw();
};
這是測試代碼這兩個擴大組和自動縮小它,以適應階段:
這個測試代碼也recenters組後reducecal ING。
// widen by 20px
// if wider than stage, scale down by 15%
$("#wider").click(function(){
drawingGroup.setWidth(drawingGroup.getWidth()+20);
rect.setWidth(drawingGroup.getWidth());
var width=drawingGroup.getWidth()*drawingGroup.scaleFactor;
if(drawingGroup.getX()+width>stageWidth){
drawingGroup.scaleBy(-0.15);
recenter();
}
setStatus();
layer.draw();
});
function recenter(){
var w=drawingGroup.getWidth()*drawingGroup.scaleFactor;
var h=drawingGroup.getHeight()*drawingGroup.scaleFactor;
drawingGroup.setX(stage.getWidth()/2-w/2);
drawingGroup.setY(stage.getHeight()/2-h/2);
}
請注意,可以正常使用setX()/ setY()。
只要確保計算縮放的組寬度/高度乘以scalingFactor。
下面是完整的代碼和一個小提琴:http://jsfiddle.net/m1erickson/UyDbW/
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.4.min.js"></script>
<style>
body{ padding:15px; }
#container{
border:solid 1px #ccc;
margin-top: 10px;
width:300px;
height:300px;
}
</style>
<script>
$(function(){
var stage = new Kinetic.Stage({
container: 'container',
width: 300,
height: 300
});
var layer = new Kinetic.Layer();
stage.add(layer);
// objects used in jquery events
var drawingGroup;
var rect,circle;
var stageWidth=stage.getWidth();
var stageHeight=stage.getHeight();
drawingGroup=new Kinetic.Group({
x:stageWidth/2-50,
y:stageHeight/2-50,
width:100,
height:100,
});
drawingGroup.offsetX=0;
drawingGroup.offsetY=0;
drawingGroup.scalePtX=0;
drawingGroup.scalePtY=0;
drawingGroup.scaleFactor=1.00;
drawingGroup.scaleBy=function(scaleChange){
// undo previous offset
this.offsetX += this.scalePtX/this.scaleFactor;
this.offsetY += this.scalePtY/this.scaleFactor;
// calc new scaling factor
var newScaleFactor = this.scaleFactor*(1+scaleChange);
// create new offset
this.offsetX -= this.scalePtX/newScaleFactor;
this.offsetY -= this.scalePtY/newScaleFactor;
// set new scale factor
this.scaleFactor=newScaleFactor;
// do the new offset
this.setOffset(this.offsetX,this.offsetY);
// do the new scale
this.setScale(this.scaleFactor);
layer.draw();
};
layer.add(drawingGroup);
var rect=new Kinetic.Rect({
x:0,
y:0,
width:100,
height:100,
stroke:"lightgray",
fill:"skyblue"
});
drawingGroup.add(rect);
var circle=new Kinetic.Circle({
x:50,
y:50,
radius:20,
fill:"blue"
});
drawingGroup.add(circle);
var status=new Kinetic.Text({
x:15,
y:15,
text:"width=100, scale=1.00",
fontSize:18,
fill:"red"
});
layer.add(status);
setStatus();
layer.draw();
function setStatus(){
var width=drawingGroup.getWidth();
var scale=Math.round(drawingGroup.scaleFactor*100);
status.setText("Width: "+width+", Scale: "+scale+"%");
}
// widen by 20px
// if wider than stage, scale down by 15%
$("#wider").click(function(){
drawingGroup.setWidth(drawingGroup.getWidth()+20);
rect.setWidth(drawingGroup.getWidth());
var width=drawingGroup.getWidth()*drawingGroup.scaleFactor;
if(drawingGroup.getX()+width>stageWidth){
drawingGroup.scaleBy(-0.15);
recenter();
}
setStatus();
layer.draw();
});
function recenter(){
var w=drawingGroup.getWidth()*drawingGroup.scaleFactor;
var h=drawingGroup.getHeight()*drawingGroup.scaleFactor;
drawingGroup.setX(stage.getWidth()/2-w/2);
drawingGroup.setY(stage.getHeight()/2-h/2);
}
}); // end $(function(){});
</script>
</head>
<body>
<p>Blue group will scale if extending past stage</p>
<button id="wider">Wider</button>
<div id="container"></div>
</body>
</html>
這是接近我所期待的。不同之處在於每次繪圖組的長度擴展時,我都試圖在繪製圖層時重繪圖像。你知道這樣做的好方法嗎? – Tom
我編輯了我的答案,以在組縮小後重新接收組。請注意,您可以在組上使用setX/setY。但是,getWidth/getHeight將報告未縮放的值,因此您必須通過drawingGroup的scaleFactor乘以該寬度/高度以獲取縮放的大小。 – markE
我有這個問題的更新。我想要做的是調整繪圖的長度,並用每個增量重新縮放繪圖。我希望繪圖以y軸爲中心,但繪圖應該從舞臺左側設置爲20px。使用遞增/遞減時,我無法正確地使用縮放比例。有沒有辦法讓這個工作? – Tom