thought
Customize Animation, define the radius by yourself, which is equivalent to the position of the original control as (0,0), calculate the new position according to each angle interval, and change with time
Turn counterclockwise
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};
}
}
Clockwise
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};
}
}
use
CircleAnimation animationw = new CircleAnimation(m);
animationw.setDuration(d);
animationw.setRepeatCount(-1);
animationw.setInterpolator(new LinearInterpolator());
imageView.startAnimation(animationw);