javascript 实现双指放大缩小旋转图片1 先记录 屏幕上 的手指数量 (记录方法 按下+1 松开-1）2 记录每个手指的在屏幕上的坐标 每个手指的touchid不一样 用数组存就行 shouzhis[touchid]= x,y3 如果屏幕上有2个手指1 缩放按照2个手指的距离来计算
private getTouchDistance():number
{
var _distance:number = 0;
var names = this.touchPoints["names"];
_distance = egret.Point.distance( this.touchPoints[names[names.length-1]],
this.touchPoints[names[names.length-2]]);
return _distance;
}
private getTouchDistance():number
{
var _distance:number = 0;
var names = this.touchPoints["names"];
_distance = egret.Point.distance( this.touchPoints[names[names.length-1]],
this.touchPoints[names[names.length-2]]);
return _distance;
}2 旋转 是按照2个手指的角度来计算
private getTouchAngle():number

{

var ang:number = 0;

var names = this.touchPoints["names"];

var p1:egret.Point = this.touchPoints[names[names.length-1]];

var p2:egret.Point = this.touchPoints[names[names.length-2]];


ang = Math.atan2((p1.y-p2.y),(p1.x-p2.x)) / this.c;

return ang;

}
private getTouchAngle():number

{

var ang:number = 0;

var names = this.touchPoints["names"];

var p1:egret.Point = this.touchPoints[names[names.length-1]];

var p2:egret.Point = this.touchPoints[names[names.length-2]];


ang = Math.atan2((p1.y-p2.y),(p1.x-p2.x)) / this.c;

return ang;

}以上就是本文的全部内容，希望对大家的学习有所帮助。