Android - 为移动创建模拟类型的动画图像

时间:2013-09-06 15:17:36

标签: java android xml game-physics

我希望创建一个类似控制器的模拟器,以便在我的xml布局中移动我的角色(这看起来与PlayStation或Xbox控制器上的类似 - 圆形模拟)。

我的第一个计划是简单地使用图像视图并在图像视图上放置4个透明按钮以允许移动,但是这有点沉闷并且想要真正有创意,但是我很难找到任何那种文件并不确定从哪里开始。

基本上,我所追求的功能是一个看似模拟的图像(见下文),然后用户可以按下并移动动画,这将触发相关的位置移动。理想情况下,我也想拥有这个,这样用户只需点击模拟上的右侧即可自动动画,然后触发正确的动作。

enter image description here

我不确定这是否可行,我要求在我的xml布局中实现,或者如果更容易,可以通过编程方式创建。

1 个答案:

答案 0 :(得分:7)

请参阅最后编辑

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你必须实现GestureDetector.OnGestureListener接口,并使用onDown,onScroll方法来检测手势,然后使用视图的onDraw(Canvas c)方法,在修改它的位置后重绘模拟的位图(并根据需要用矩阵转换它

你也可以在这个答案中使用onTouchEvent: OnUp event on GestureDetector

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修改
这是一个尝试,不使用位图,只是drawCircle方法:


 这不是太复杂, 我写得很快,所以肯定有改进,但它的效果很好:

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class AnalogueView extends View {

    float x,y;
    double r,t;
    int cx, cy,w,h;
    final int RADIUS = 20;
    Paint black = new Paint();
    Paint grey = new Paint();
    Paint white = new Paint();

    private int toDo;

    public AnalogueView(Context context, AttributeSet attrs) {
        super(context, attrs);
        black.setColor(Color.BLACK);
        grey.setColor(Color.GRAY);
        white.setColor(Color.WHITE);
        black.setFlags(Paint.ANTI_ALIAS_FLAG);
        white.setFlags(Paint.ANTI_ALIAS_FLAG);
        grey.setFlags(Paint.ANTI_ALIAS_FLAG);
    }
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        this.w = w;
        this.h = h;
        cx = w/2;
        cy = h/2;
        x = cx;y=cy;
        super.onSizeChanged(w, h, oldw, oldh);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        drawMyStuff(canvas);
        switch (toDo) {
        case 1:
            center();
            break;
        default:
            break;
        }

    }

    private void drawMyStuff(final Canvas canvas) {
        canvas.drawCircle(cx, cy, w/2, black);
        canvas.drawCircle(cx, cy, w/2-5, grey);
        canvas.drawCircle(cx, cy, w/2-10, black);
        canvas.drawCircle(x, y, RADIUS+2, white);
        canvas.drawCircle(x, y, RADIUS, grey);
    }

//  n2p : normal to polar coordinates conversion
//  p2n : polar to normal coordinates conversion
//  R : distance to polar center 
//  T : polar angle
    double n2pR(double x, double y){
        return distance(x,y,cx,cy);
    }

    double n2pT(double x, double y){
        return Math.atan2((y-cy),(x-cx));
    }

    double p2nX(double r, double t){
        return r*Math.cos(t) + cx;
    }



    double p2nY(double r, double t){
        return r*Math.sin(t) + cy;
    }

    double n2pR(){
        return distance(x,y,cx,cy);
    }

    double n2pT(){
        return Math.atan2((y-cy),(x-cx));
    }

    double p2nX(){
        return r*Math.cos(t) + cx;
    }

    double p2nY(){
        return r*Math.sin(t) + cy;
    }

    double distance(double x1 , double y1, double x2, double y2 ){
        return Math.sqrt(Math.pow(x1-x2, 2)+Math.pow(y1-y2, 2));
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        switch(event.getAction()){
        case MotionEvent.ACTION_DOWN :
            updatePosition(event);
            break;

        case MotionEvent.ACTION_MOVE :
            updatePosition(event);
            break;

        case MotionEvent.ACTION_UP :
            toDo = 1; 
            center(); 
            break;
        default :break;

        }

        return true;
    }

    private void center(){
        if(r>15){
            r-=15;
        }else{
            toDo=0;
            r=0;
        }
        x = (float) p2nX();
        y= (float) p2nY();
        invalidate();
    }

    void updatePosition(MotionEvent e){
        r= Math.min(w/2-RADIUS, n2pR(e.getX(),e.getY()));
        t = n2pT(e.getX(),e.getY());
        x = (float) p2nX();
        y =(float) p2nY();

        invalidate();
    }
}

以下是如何将其添加到布局中:

<yourpackage.AnalogueView
    android:id="@+id/analogueView1"
    android:layout_width="80px"
    android:layout_height="80px"
     />

为了检测不同的模拟事件,您可以使用所需的方法定义添加一个Listener,并使用AnalogView中的接口,然后当您想要为AnalogView实现一个行为时,您只需通过以下方法添加一个实现:为侦听器调用setter(就像Button的setOnClickListener一样)。这样,您将拥有一个完全封装的AnalogView,您可以在任何其他应用程序中重复使用。

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最后编辑:使用侦听器处理事件:

我使用AnalogueView嵌入了一个Listener,现在你可以像使用OnClickListener一样使用它了,

使用setOnMoveListener方法提供两种方法的实现:

onMaxMoveInDirection(double polar_angle_of_direction) and 
onHalfMoveInDirection(double polar_angle_of_direction)

这是AnalogueView的新代码(没有大的修改,只是接口定义,moveListener字段并触发updatePosition中的动作):

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class AnalogueView extends View {

    OnMoveListener moveListener;


    float x,y;
    double r,t;
    int cx, cy,w,h;
    final int RADIUS = 20;
    Paint black = new Paint();
    Paint grey = new Paint();
    Paint white = new Paint();

    private int toDo;

    public AnalogueView(Context context, AttributeSet attrs) {
        super(context, attrs);
        black.setColor(Color.BLACK);
        grey.setColor(Color.GRAY);
        white.setColor(Color.WHITE);
        black.setFlags(Paint.ANTI_ALIAS_FLAG);
        white.setFlags(Paint.ANTI_ALIAS_FLAG);
        grey.setFlags(Paint.ANTI_ALIAS_FLAG);
    }
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        this.w = w;
        this.h = h;
        cx = w/2;
        cy = h/2;
        x = cx;y=cy;
        super.onSizeChanged(w, h, oldw, oldh);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        drawMyStuff(canvas);
        switch (toDo) {
        case 1:
            center();
            break;
        default:
            break;
        }

    }

    private void drawMyStuff(final Canvas canvas) {
        canvas.drawCircle(cx, cy, w/2, black);
        canvas.drawCircle(cx, cy, w/2-5, grey);
        canvas.drawCircle(cx, cy, w/2-10, black);
        canvas.drawCircle(x, y, RADIUS+2, white);
        canvas.drawCircle(x, y, RADIUS, grey);
    }

//  n2p : normal to polar coordinates conversion
//  p2n : polar to normal coordinates conversion
//  R : distance to polar center 
//  T : polar angle
    double n2pR(double x, double y){
        return distance(x,y,cx,cy);
    }

    double n2pT(double x, double y){
        return Math.atan2((y-cy),(x-cx));
    }

    double p2nX(double r, double t){
        return r*Math.cos(t) + cx;
    }



    double p2nY(double r, double t){
        return r*Math.sin(t) + cy;
    }

    double n2pR(){
        return distance(x,y,cx,cy);
    }

    double n2pT(){
        return Math.atan2((y-cy),(x-cx));
    }

    double p2nX(){
        return r*Math.cos(t) + cx;
    }

    double p2nY(){
        return r*Math.sin(t) + cy;
    }

    double distance(double x1 , double y1, double x2, double y2 ){
        return Math.sqrt(Math.pow(x1-x2, 2)+Math.pow(y1-y2, 2));
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        switch(event.getAction()){
        case MotionEvent.ACTION_DOWN :
            updatePosition(event);
            break;

        case MotionEvent.ACTION_MOVE :
            updatePosition(event);
            break;

        case MotionEvent.ACTION_UP :
            toDo = 1; 
            center(); 
            break;
        default :break;

        }

        return true;
    }

    private void center(){
        if(r>15){
            r-=15;
        }else{
            toDo=0;
            r=0;
        }
        x = (float) p2nX();
        y= (float) p2nY();
        invalidate();
    }

    void updatePosition(MotionEvent e){
        r= Math.min(w/2-RADIUS, n2pR(e.getX(),e.getY()));
        t = n2pT(e.getX(),e.getY());
        x = (float) p2nX();
        y =(float) p2nY();


        if(moveListener != null)
            if(r == w/2-RADIUS)
                moveListener.onMaxMoveInDirection(t);
            else if(r >= w/4-RADIUS/2)
                moveListener.onHalfMoveInDirection(t);

        invalidate();
    }

    public void setOnMoveListener(OnMoveListener listener){
        moveListener =listener;
    }

    public interface OnMoveListener{
        public void onHalfMoveInDirection(double polarAngle);
        public void onMaxMoveInDirection(double polarAngle);
    }
}

以下是如何提供实现:

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

import com.analog.AnalogueView.OnMoveListener;



public class MainActivity extends Activity {
    AnalogueView analogue;
    TextView showMoveEvent;

    @Override
    protected void onCreate(Bundle savedInstanceState)  {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        showMoveEvent = (TextView) findViewById(R.id.showMoveEvent);
        analogue = (AnalogueView) findViewById(R.id.analogueView1);
        analogue.setOnMoveListener(new OnMoveListener() {

            @Override
            public void onMaxMoveInDirection(double polarAngle) {
                showMoveEvent.setText("max move in "+polarAngle+" direction");
            }

            @Override
            public void onHalfMoveInDirection(double polarAngle) {
                showMoveEvent.setText("half move in "+polarAngle+" direction");

            }
        });
    }



}

结果:在文本字段中显示事件:

enter image description here