Androidアプリを作成していますが、トリッキーなことをしています。キャンバス上にパスを描画する必要がありますが、描画はアニメーション化する必要があります(つまり、少し遅れます)。
Android SDKを使用してこのようなものを作成することは可能ですか?できない場合、どのようにこの効果を生み出すことができますか?
このコードを試してください、Path
&Canvas
を使用してハートビートを描くために使用しました:
public class TestActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new HeartbeatView(this));
}
public static class HeartbeatView extends View {
private static Paint paint;
private int screenW, screenH;
private float X, Y;
private Path path;
private float initialScreenW;
private float initialX, plusX;
private float TX;
private boolean translate;
private int flash;
private Context context;
public HeartbeatView(Context context) {
super(context);
this.context=context;
Paint = new Paint();
Paint.setColor(Color.argb(0xff, 0x99, 0x00, 0x00));
Paint.setStrokeWidth(10);
Paint.setAntiAlias(true);
Paint.setStrokeCap(Paint.Cap.ROUND);
Paint.setStrokeJoin(Paint.Join.ROUND);
Paint.setStyle(Paint.Style.STROKE);
Paint.setShadowLayer(7, 0, 0, Color.RED);
path= new Path();
TX=0;
translate=false;
flash=0;
}
@Override
public void onSizeChanged (int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
screenW = w;
screenH = h;
X = 0;
Y = (screenH/2)+(screenH/4)+(screenH/10);
initialScreenW=screenW;
initialX=((screenW/2)+(screenW/4));
plusX=(screenW/24);
path.moveTo(X, Y);
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
//canvas.save();
flash+=1;
if(flash<10 || (flash>20 && flash<30))
{
Paint.setStrokeWidth(16);
Paint.setColor(Color.RED);
Paint.setShadowLayer(12, 0, 0, Color.RED);
}
else
{
Paint.setStrokeWidth(10);
Paint.setColor(Color.argb(0xff, 0x99, 0x00, 0x00));
Paint.setShadowLayer(7, 0, 0, Color.RED);
}
if(flash==100)
{
flash=0;
}
path.lineTo(X,Y);
canvas.translate(-TX, 0);
if(translate==true)
{
TX+=4;
}
if(X<initialX)
{
X+=8;
}
else
{
if(X<initialX+plusX)
{
X+=2;
Y-=8;
}
else
{
if(X<initialX+(plusX*2))
{
X+=2;
Y+=14;
}
else
{
if(X<initialX+(plusX*3))
{
X+=2;
Y-=12;
}
else
{
if(X<initialX+(plusX*4))
{
X+=2;
Y+=6;
}
else
{
if(X<initialScreenW)
{
X+=8;
}
else
{
translate=true;
initialX=initialX+initialScreenW;
}
}
}
}
}
}
canvas.drawPath(path, Paint);
//canvas.restore();
invalidate();
}
}
}
カウンターを使用して、いくつかの効果を持つポイントごとにパスを描画します。必要なものを取り、それをより効率的なSurfaceViewに転送できます。
これがあなたが探しているものであることを願っています。それはユーザーのタッチでパスを描画します、あなたはあなたが望むものを達成するためにそれを単純に変えることができます。
public class MyCanvas extends Activity implements OnTouchListener{
DrawPanel dp;
private ArrayList<Path> pointsToDraw = new ArrayList<Path>();
private Paint mPaint;
Path path;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
dp = new DrawPanel(this);
dp.setOnTouchListener(this);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
mPaint = new Paint();
mPaint.setDither(true);
mPaint.setColor(Color.WHITE);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(30);
FrameLayout fl = new FrameLayout(this);
fl.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
fl.addView(dp);
setContentView(fl);
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
dp.pause();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
dp.resume();
}
public class DrawPanel extends SurfaceView implements Runnable{
Thread t = null;
SurfaceHolder holder;
boolean isItOk = false ;
public DrawPanel(Context context) {
super(context);
// TODO Auto-generated constructor stub
holder = getHolder();
}
@Override
public void run() {
// TODO Auto-generated method stub
while( isItOk == true){
if(!holder.getSurface().isValid()){
continue;
}
Canvas c = holder.lockCanvas();
c.drawARGB(255, 0, 0, 0);
onDraw(c);
holder.unlockCanvasAndPost(c);
}
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
synchronized(pointsToDraw)
{
for (Path path : pointsToDraw) {
canvas.drawPath(path, mPaint);
}
}
}
public void pause(){
isItOk = false;
while(true){
try{
t.join();
}catch(InterruptedException e){
e.printStackTrace();
}
break;
}
t = null;
}
public void resume(){
isItOk = true;
t = new Thread(this);
t.start();
}
}
@Override
public boolean onTouch(View v, MotionEvent me) {
// TODO Auto-generated method stub
synchronized(pointsToDraw)
{
if(me.getAction() == MotionEvent.ACTION_DOWN){
path = new Path();
path.moveTo(me.getX(), me.getY());
//path.lineTo(me.getX(), me.getY());
pointsToDraw.add(path);
}else if(me.getAction() == MotionEvent.ACTION_MOVE){
path.lineTo(me.getX(), me.getY());
}else if(me.getAction() == MotionEvent.ACTION_UP){
//path.lineTo(me.getX(), me.getY());
}
}
return true;
}
}
これは役立つかもしれません...アニメーション可能なパスをシミュレートするために、パスではなく隣接する円を描画します。
public class PathAnimatable {
private final float CIRCLE_SIZE = 2.5f;
public float SPPED_SCALE = 1f;
private float steps = 0;
private float pathLength;
private PathMeasure pathMeasure;
private float totalStepsNeeded;
private float[] point = new float[]{0f, 0f};
private float stride;
public PathAnimatable() {
this(null);
}
public PathAnimatable(Path path) {
super(path);
init();
}
private void init() {
pathMeasure = new PathMeasure(path, false);
pathLength = pathMeasure.getLength();
stride = CIRCLE_SIZE * 0.5f;
totalStepsNeeded = pathLength / stride;
steps = 0;
}
@Override
public void setPath(Path path) {
super.setPath(path);
init();
}
// Called this from your locked canvas loop function
public void drawShape(Canvas canvas, Paint paint) {
if (steps <= pathLength) {
for (float i = 0; i < steps ; i += stride) {
pathMeasure.getPosTan(i, point, null);
canvas.drawCircle(point[0], point[1], CIRCLE_SIZE, Paint);
}
steps += stride * SPPED_SCALE;
} else {
steps = 0;
}
}
}