android自定义view实现圆周运动
时间：2021-10-06 09:08:31 | 栏目：Android代码 | 点击：次
本文实例为大家分享了android自定义view实现圆周运动的具体代码，供大家参考，具体内容如下
思想
自定义Animation，自己定义半径，相当于原来控件的位置为（0,0），按照每个角度区间，计算新的位置，跟着时间变动
逆时针转动
public class VenusCircleAnimation extends Animation {
private int radii;
public VenusCircleAnimation(int radii) {
this.radii = radii;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
//根据取值范围 确定圆周运动的角度范围。360-0
float d = 360 * interpolatedTime;//interpolatedTime 取值范围 0-1,表示时间
if (d > 360) { //算法二
d = d-360;
}
int[] ps = getNewLocation((int) d, radii);//
t.getMatrix().setTranslate(ps[0], ps[1]);
}
public int[] getNewLocation(int newAngle, int r) {
int newAngle1;
int newX = 0, newY = 0;
if (newAngle >= 0 && newAngle <= 90) {
// Math.PI/180得到的结果就是1°，然后再乘以角度得到角度
newX = (int) ( - (r * Math.cos(newAngle * Math.PI / 180)));
newY = (int) (r * Math.sin(newAngle * Math.PI / 180));
} else if (newAngle >= 90 && newAngle <= 180) {// 90-180
newAngle1 = 180 - newAngle;
newX = (int) (r * Math.cos(newAngle1 * Math.PI / 180));
newY = (int) (r * Math.sin(newAngle1 * Math.PI / 180));
} else if (newAngle >= 180 && newAngle <= 270) {//180-270
newAngle1 = 270 - newAngle;
newX = (int) (r * Math.sin(newAngle1 * Math.PI / 180));
newY = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180)));
} else if (newAngle >= 270) {//270-360
newAngle1 = 360 - newAngle;
newX = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180)));
newY = (int) ( - (r * Math.sin(newAngle1 * Math.PI / 180)));
}
return new int[]{newX, newY};
}
}
顺时针
public class CircleAnimation extends Animation {
private int radii;
public CircleAnimation(int radii) {
this.radii = radii;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
float d = 360 * interpolatedTime ;
if (d > 360) {
d = d - 360;
}
int[] ps = getNewLocation((int) d, radii);//
t.getMatrix().setTranslate(ps[0], ps[1]);
}
public int[] getNewLocation(int newAngle, int r) {
int newAngle1;
int newX = 0, newY = 0;
if (newAngle >= 0 && newAngle <= 90) {
newX = (int) (r * Math.sin(newAngle * Math.PI / 180));
newY = (int) ( - (r * Math.cos(newAngle * Math.PI / 180)));
} else if (newAngle >= 90 && newAngle <= 180) {// 90-180
newAngle1 = 180 - newAngle;
newX = (int) (r * Math.sin(newAngle1 * Math.PI / 180));
newY = (int) (r * Math.cos(newAngle1 * Math.PI / 180));
} else if (newAngle >= 180 && newAngle <= 270) {//180-270
newAngle1 = 270 - newAngle;
newX = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180)));
newY = (int) (r * Math.sin(newAngle1 * Math.PI / 180));
} else if (newAngle >= 270 && newAngle <= 360) {//270-360
newAngle1 = 360 - newAngle;
newX = (int) ( - (r * Math.sin(newAngle1 * Math.PI / 180)));
newY = (int) ( - (r * Math.cos(newAngle1 * Math.PI / 180)));
}
return new int[]{newX, newY};
}
}
使用
CircleAnimation animationw = new CircleAnimation(m); animationw.setDuration(d); animationw.setRepeatCount(-1); animationw.setInterpolator(new LinearInterpolator()); imageView.startAnimation(animationw);