Android 基于图像的椭圆路径动画
我正在尝试实现椭圆路径动画,我想用图像显示路径动画,我试过了,但它不适用于椭圆。我也尝试了下面的椭圆路径代码,但它是显示圆,有人有主意吗?提前感谢 MyAnimation.javaAndroid 基于图像的椭圆路径动画,android,animation,path,oval,Android,Animation,Path,Oval,我正在尝试实现椭圆路径动画,我想用图像显示路径动画,我试过了,但它不适用于椭圆。我也尝试了下面的椭圆路径代码,但它是显示圆,有人有主意吗?提前感谢 MyAnimation.java public class MyAnimation extends Animation { private View view; private float cx, cy; // center x,y position of circular path private fl
public class MyAnimation extends Animation {
private View view;
private float cx, cy; // center x,y position of circular path
private float prevX, prevY; // previous x,y position of image during animation
private float r; // radius of circle
private float prevDx, prevDy;
/**
* @param view - View that will be animated
* @param r - radius of circular path
*/
public MyAnimation(View view, float r){
this.view = view;
this.r = r;
}
@Override
public boolean willChangeBounds() {
return true;
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
// calculate position of image center
int cxImage = width / 2;
int cyImage = height / 1;
cx = view.getLeft() + cxImage;
cy = view.getTop() + cyImage;
// set previous position to center
prevX = cx;
prevY = cy;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
if(interpolatedTime == 0){
t.getMatrix().setTranslate(prevDx, prevDy);
return;
}
float angleDeg = (interpolatedTime * 360f + 90) % 360;
float angleRad = (float) Math.toRadians(angleDeg);
// r = radius, cx and cy = center point, a = angle (radians)
float x = (float) (cx + r * Math.cos(angleRad));
float y = (float) (cy + r * Math.sin(angleRad));
float dx = prevX - x;
float dy = prevY - y;
prevX = x;
prevY = y;
prevDx = dx;
prevDy = dy;
t.getMatrix().setTranslate(dx, dy);
}
}
image = (ImageView) findViewById(R.id.image);
image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Animation anim = new MyAnimation(image, 300);
anim.setDuration(1000);
image.startAnimation(anim);
}
});
PathAnimation.java
public class MyAnimation extends Animation {
private View view;
private float cx, cy; // center x,y position of circular path
private float prevX, prevY; // previous x,y position of image during animation
private float r; // radius of circle
private float prevDx, prevDy;
/**
* @param view - View that will be animated
* @param r - radius of circular path
*/
public MyAnimation(View view, float r){
this.view = view;
this.r = r;
}
@Override
public boolean willChangeBounds() {
return true;
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
// calculate position of image center
int cxImage = width / 2;
int cyImage = height / 1;
cx = view.getLeft() + cxImage;
cy = view.getTop() + cyImage;
// set previous position to center
prevX = cx;
prevY = cy;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
if(interpolatedTime == 0){
t.getMatrix().setTranslate(prevDx, prevDy);
return;
}
float angleDeg = (interpolatedTime * 360f + 90) % 360;
float angleRad = (float) Math.toRadians(angleDeg);
// r = radius, cx and cy = center point, a = angle (radians)
float x = (float) (cx + r * Math.cos(angleRad));
float y = (float) (cy + r * Math.sin(angleRad));
float dx = prevX - x;
float dy = prevY - y;
prevX = x;
prevY = y;
prevDx = dx;
prevDy = dy;
t.getMatrix().setTranslate(dx, dy);
}
}
image = (ImageView) findViewById(R.id.image);
image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Animation anim = new MyAnimation(image, 300);
anim.setDuration(1000);
image.startAnimation(anim);
}
});
在多次尝试使用这个自定义类之后,我找到了解决方案 AnimationView.java
public class AnimationView extends View {
Paint paint;
long animationDuration = 10000;
int framesPerSecond = 60;
Bitmap bm;
int bm_offsetX, bm_offsetY;
Path animPath;
PathMeasure pathMeasure;
float pathLength;
float step; //distance each step
float distance; //distance moved
float[] pos;
float[] tan;
Matrix matrix;
public AnimationView(Context context) {
super(context);
initMyView();
}
public AnimationView(Context context, AttributeSet attrs) {
super(context, attrs);
initMyView();
}
public AnimationView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initMyView();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void initMyView(){
paint = new Paint();
paint.setColor(Color.RED);
paint.setStrokeWidth(5);
paint.setStyle(Paint.Style.STROKE);
bm = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
bm_offsetX = bm.getWidth()/2;
bm_offsetY = bm.getHeight()/2;
animPath = new Path();
animPath.moveTo(100, 100);
animPath.addArc(new RectF(1, 100, 300, 600), 1, 800);
animPath.close();
pathMeasure = new PathMeasure(animPath, false);
pathLength = pathMeasure.getLength();
Toast.makeText(getContext(), "pathLength: " + pathLength, Toast.LENGTH_LONG).show();
step = 1;
distance = 0;
pos = new float[2];
tan = new float[2];
matrix = new Matrix();
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawPath(animPath, paint);
if(distance < pathLength){
pathMeasure.getPosTan(distance, pos, tan);
matrix.reset();
float degrees = (float)(Math.atan2(tan[1], tan[0])*180.0/Math.PI);
matrix.postRotate(degrees, bm_offsetX, bm_offsetY);
matrix.postTranslate(pos[0]-bm_offsetX, pos[1]-bm_offsetY);
canvas.drawBitmap(bm, matrix, null);
distance += step;
}else{
distance = 0;
}
invalidate();
}
}
public类AnimationView扩展了视图{
油漆;
长动画持续时间=10000;
int framesPerSecond=60;
位图bm;
int bm_offsetX,bm_offsetY;
路径;路径;
路径测量路径测量;
浮动路径长度;
浮动步长;//每个步长的距离
浮动距离;//移动的距离
浮动[]pos;
浮法[]谭;
矩阵;
公共动画视图(上下文){
超级(上下文);
initMyView();
}
公共动画视图(上下文、属性集属性){
超级(上下文,attrs);
initMyView();
}
公共动画视图(上下文、属性集属性、int defStyleAttr){
super(上下文、attrs、defStyleAttr);
initMyView();
}
@TargetApi(Build.VERSION\u code.LOLLIPOP)
public void initMyView(){
油漆=新油漆();
油漆。设置颜色(颜色。红色);
油漆。设置行程宽度(5);
绘制.设置样式(绘制.样式.笔划);
bm=BitmapFactory.decodeResource(getResources(),R.mipmap.ic_启动器);
bm_offsetX=bm.getWidth()/2;
bm_offsetY=bm.getHeight()/2;
animPath=新路径();
animPath.moveTo(100100);
addArc(新的RectF(1100300600),1800);
animPath.close();
pathMeasure=新的pathMeasure(animPath,false);
pathLength=pathMeasure.getLength();
Toast.makeText(getContext(),“pathLength:+pathLength,Toast.LENGTH_LONG).show();
步骤=1;
距离=0;
pos=新浮动[2];
tan=新浮点数[2];
矩阵=新矩阵();
}
@凌驾
受保护的void onDraw(画布){
画布.绘制路径(动画路径,绘制);
if(距离<路径长度){
getPosTan(距离、位置、tan);
matrix.reset();
浮点度数=(浮点)(数学atan2(tan[1],tan[0])*180.0/数学PI);
矩阵。后旋转(度、bm_偏移量x、bm_偏移量);
后翻译(pos[0]-bm_offsetX,pos[1]-bm_offsetY);
drawBitmap(bm、矩阵、空);
距离+=步长;
}否则{
距离=0;
}
使无效();
}
}
并将其转换为xml
<com.example.android.mydemo.animation.pathanimation.AnimationView
android:layout_width="match_parent"
android:layout_height="450dp" />
请帮我解决这个问题!!!