cocoscreater 旋转角度计算
getVectorRadians( x1, y1, x2, y2) { let len_y = y2 - y1; let len_x = x2 - x1; let tan_yx = Math.abs(len_y)/Math.abs(len_x); let angle = 0; if(len_y > 0 && len_x < 0) { angle = Math.atan(tan_yx)*180/Math.PI - 90; } else if (len_y > 0 && len_x > 0) { angle = 90 - Math.atan(tan_yx)*180/Math.PI; } else if(len_y < 0 && len_x < 0) { angle = -Math.atan(tan_yx)*180/Math.PI - 90; } else if(len_y < 0 && len_x > 0) { angle = Math.atan(tan_yx)*180/Math.PI + 90; } return angle; },
//另一种计算方式
rotationTarget(startPos,endPos){ let direction = endPos.sub(startPos).normalize();
var radian = direction.signAngle(cc.v2(1,0)); //将弧度转换为欧拉角 var angle = radian / Math.PI * 180 + 90; //赋值给节点 return angle; }