旋转罗盘
一、RotatView
package com.sun.shine.myrotation.view;
import Android.content.context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.os.handler;
import android.os.message;
import android.util.AttributeSet;
import android.view.motionevent;
import android.view.surfaceview;
import android.view.View;
public class RotatView extends View {
float o_x;
float o_y;
Handler handler;
int delayedTime = 20;
static final int play = 0;
static final int stop = 1;
double currentTime = 0;
int width;
int height;
double maxwidth;
Bitmap rotatBitmap;
public RotatView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
vRecord = new VRecord();
handler = new Handler() {
@Override
public void handleMessage(Message msg) {
double detaTime = system.currenttimemillis() - currentTime;
switch (msg.what) {
case play: {
if (isClockWise) {
speed = speed - a * detaTime;
if (speed <= 0) {
return;
} else {
handler.sendemptyMessageDelayed(play, delayedTime);
}
} else {
speed = speed + a * detaTime;
if (speed >= 0) {
return;
} else {
handler.sendEmptyMessageDelayed(play, delayedTime);
}
}
addDegree((float)(speed * detaTime + (a * detaTime * detaTime) / 2));
// if (a < a_max) {
// a = (float)(a + a_add*detaTime);
// System.out.println("a:"+a);
// }
currentTime = System.currentTimeMillis();
invalidate();
break;
}
case stop: {
speed = 0;
handler.removeMessages(play);
}
}
super.handleMessage(msg);
}
};
initSize();
}
public void setRotatBitmap(Bitmap bitmap) {
rotatBitmap = bitmap;
initSize();
postInvalidate();
}
public void setRotatDrawableResource(int id) {
BitmapDrawable drawable = (BitmapDrawable)getContext().getresources().getDrawable(id);
setRotatDrawable(drawable);
}
public void setRotatDrawable(BitmapDrawable drawable) {
rotatBitmap = drawable.getBitmap();
initSize();
postInvalidate();
}
private void initSize() {
if (rotatBitmap == null) {
// throw new NoBitMapERROR("Error,No bitmap in RotatView!");
return;
}
width = rotatBitmap.getWidth();
height = rotatBitmap.getHeight();
maxwidth = Math.sqrt(width * width + height * height);
o_x = o_y = (float)(maxwidth / 2);// ȷ��Բ�����
}
private void addDegree(float added) {
deta_degree += added;
if (deta_degree > 360 || deta_degree < -360) {
deta_degree = deta_degree % 360;
}
}
@Override
protected void onDraw(Canvas canvas) {
Matrix matrix = new Matrix();
matrix.setTranslate((float)width / 2, (float)height / 2);
matrix.preRotate(deta_degree);
matrix.preTranslate(-(float)width / 2, -(float)height / 2);
matrix.postTranslate((float)(maxwidth - width) / 2, (float)(maxwidth - height) / 2);
canvas.drawbitmap(rotatBitmap, matrix, paint);
super.onDraw(canvas);
}
Paint paint = new Paint();
@Override
protected void onmeasure(int widthmeasurespec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension((int)maxwidth, (int)maxwidth);
}
float down_x;
float down_y;
float target_x;
float target_y;
float up_x;
float up_y;
float current_degree;
float up_degree;
float deta_degree;
double lastMoveTime = 0;
public static final float a_min = 0.001f;
public static final float a_add = 0.001f;
float a = a_min;
public static final float a_max = a_min * 5;
double speed = 0;
VRecord vRecord;
boolean isClockWise;
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
if (rotatBitmap == null) {
throw new NoBitMapError("Error,No bitmap in RotatView!");
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
down_x = event.getX();
down_y = event.getY();
current_degree = detaDegree(o_x, o_y, down_x, down_y);
vRecord.reset();
// handler.sendEmptyMessage(stop);
a = a_max;
break;
}
case MotionEvent.ACTION_MOVE: {
down_x = target_x = event.getX();
down_y = target_y = event.getY();
float degree = detaDegree(o_x, o_y, target_x, target_y);
float dete = degree - current_degree;
if (dete < -270) {
dete = dete + 360;
} else if (dete > 270) {
dete = dete - 360;
}
lastMoveTime = System.currentTimeMillis();
vRecord.add(dete, lastMoveTime);
addDegree(dete);
current_degree = degree;
postInvalidate();
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP: {
a = a_min;
double lastupTime = System.currentTimeMillis();
double detaTime = lastupTime - lastMoveTime;
up_x = event.getX();
up_y = event.getY();
up_degree = detaDegree(o_x, o_y, up_x, up_y);
speed = speed + vRecord.getSpeed();
if (speed > 0) {
speed = Math.min(VRecord.max_speed, speed);
} else {
speed = Math.max(-VRecord.max_speed, speed);
}
// System.out.println("speed:" + speed);
if (speed > 0) {
isClockWise = true;
// v = 1;
} else {
isClockWise = false;
// v = -1;
}
currentTime = System.currentTimeMillis();
handler.sendEmptyMessage(0);
break;
}
}
return true;
}
float detaDegree(float src_x, float src_y, float target_x, float target_y) {
float detaX = target_x - src_x;
float detaY = target_y - src_y;
double d;
if (detaX != 0) {
float tan = Math.abs(detaY / detaX);
if (detaX > 0) {
if (detaY >= 0) {
d = Math.atan(tan);
} else {
d = 2 * Math.PI - Math.atan(tan);
}
} else {
if (detaY >= 0) {
d = Math.PI - Math.atan(tan);
} else {
d = Math.PI + Math.atan(tan);
}
}
} else {
if (detaY > 0) {
d = Math.PI / 2;
} else {
d = -Math.PI / 2;
}
}
return (float)((d * 180) / Math.PI);
}
static class NoBitMapError extends runtimeexception {
/**
*
*/
private static final long serialversionuid = 1L;
public NoBitMapError(String detailMessage) {
super(detailMessage);
}
}
static class VRecord {
int addCount;
public static final int length = 15;
double[][] record = new double[length][2];
public void add(double detadegree, double time) {
for (int i = length - 1; i > 0; i--) {
record[i][0] = record[i - 1][0];
record[i][1] = record[i - 1][1];
}
record[0][0] = detadegree;
record[0][1] = time;
addCount++;
}
public static final double max_speed = 8;
public double getSpeed() {
if (addCount == 0) {
return 0;
}
int maxIndex = Math.min(addCount, length) - 1;
if ((record[0][1] - record[maxIndex][1]) == 0) {
return 0;
}
double detaTime = record[0][1] - record[maxIndex][1];
double sumdegree = 0;
for (int i = 0; i < length - 1; i++) {
sumdegree += record[i][0];
// System.out.println(record[i][0]);
}
// System.out.println("----------");
// System.out.println(sumdegree);
// System.out.println(detaTime);
double result = sumdegree / detaTime;
if (result > 0) {
return Math.min(result, max_speed);
} else {
return Math.max(result, -max_speed);
}
// System.out.println("v=" + result);
}
public void reset() {
addCount = 0;
for (int i = length - 1; i > 0; i--) {
record[i][0] = 0;
record[i][1] = 0;
}
}
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (rotatBitmap != null) {
rotatBitmap.recycle();
rotatBitmap = null;
}
}
}
二、MainActivity
package com.sun.shine.myrotation;
import com.sun.shine.myrotation.view.RotatView;
import android.os.Bundle;
import android.APP.Activity;
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedinstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RotatView rotatView=(RotatView)findViewById(R.id.myRotatView);
rotatView.setRotatDrawableResource(R.drawable.cycle);
}
}
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