Custom view to draw bitmap along path, calculate in background thread

Advertisemen
Last post show a example of "Custom view to draw bitmap along path", with calculation run inside onDraw(). It's modified version to pre-calculate in back thread.


(remark: in last post, canvas.drawPath() is called inside onDraw(). It seem run very slow, removed in this example.)

Modify AnimationView.java
package com.blogspot.android_er.androidmovingbitmapalongpath;

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

import java.util.ArrayList;
import java.util.List;

public class AnimationView extends View {

List<AnimationThing> animationThingsList;
public AnimationView(Context context) {
super(context);
initAnimationView();
}

public AnimationView(Context context, AttributeSet attrs) {
super(context, attrs);
initAnimationView();
}

public AnimationView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initAnimationView();
}

private void initAnimationView(){
animationThingsList = new ArrayList<>();
}

public void insertThing(AnimationThing thing){
animationThingsList.add(thing);
}

//prepare calculation in background thread
public void preDraw(){
for (AnimationThing thing : animationThingsList){
if(thing.distance < thing.pathLength){
thing.pathMeasure.getPosTan(thing.distance, thing.pos, thing.tan);

thing.matrix.reset();
float degrees = (float)(Math.atan2(thing.tan[1],
thing.tan[0])*180.0/Math.PI);
thing.matrix.postRotate(degrees, thing.bm_offsetX, thing.bm_offsetY);
thing.matrix.postTranslate(thing.pos[0]-thing.bm_offsetX,
thing.pos[1]-thing.bm_offsetY);

thing.distance += thing.step;
}else{
thing.distance = 0;
}
}
}

@Override
protected void onDraw(Canvas canvas) {
for (AnimationThing thing : animationThingsList){
canvas.drawBitmap(thing.bm, thing.matrix, null);
}

invalidate();
}


/*
@Override
protected void onDraw(Canvas canvas) {
for (AnimationThing thing : animationThingsList){

//This code run slow!!!
//canvas.drawPath(thing.animPath, thing.paint);

if(thing.distance < thing.pathLength){
thing.pathMeasure.getPosTan(thing.distance, thing.pos, thing.tan);

thing.matrix.reset();
float degrees = (float)(Math.atan2(thing.tan[1],
thing.tan[0])*180.0/Math.PI);
thing.matrix.postRotate(degrees, thing.bm_offsetX, thing.bm_offsetY);
thing.matrix.postTranslate(thing.pos[0]-thing.bm_offsetX,
thing.pos[1]-thing.bm_offsetY);

canvas.drawBitmap(thing.bm, thing.matrix, null);

thing.distance += thing.step;
}else{
thing.distance = 0;
}
}

invalidate();
}
*/



}


MainActivity.java
package com.blogspot.android_er.androidmovingbitmapalongpath;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Path;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

AnimationView myAnimationView;
AniThread myAniThread;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myAnimationView = (AnimationView)findViewById(R.id.MyAnimationView);

prepareThings();
myAniThread = new AniThread(myAnimationView);
myAniThread.start();

}

private void prepareThings() {
Path animPath;
float step;
Bitmap bm;

bm = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);

animPath = new Path();
animPath.moveTo(100, 100);
animPath.lineTo(200, 100);
animPath.lineTo(300, 50);
animPath.lineTo(400, 150);
animPath.lineTo(100, 300);
animPath.lineTo(600, 300);
animPath.lineTo(100, 100);
animPath.close();

step = 1;

AnimationThing thing = new AnimationThing(animPath, bm, step);
myAnimationView.insertThing(thing);

//The second thing
bm = BitmapFactory.decodeResource(getResources(), android.R.drawable.ic_menu_add);

animPath.reset();
animPath.addCircle(400, 400, 300, Path.Direction.CW);
step = 3;
thing = new AnimationThing(animPath, bm, step);
myAnimationView.insertThing(thing);
}

class AniThread extends Thread{

AnimationView targetView;

public AniThread(AnimationView target) {
super();
targetView = target;
}

@Override
public void run() {
while (true){
targetView.preDraw();
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

}
}


}


The other files, AnimationThing.java and activity_main.xml, refer last post.


download filesDownload the files .

Advertisemen

Disclaimer: Gambar, artikel ataupun video yang ada di web ini terkadang berasal dari berbagai sumber media lain. Hak Cipta sepenuhnya dipegang oleh sumber tersebut. Jika ada masalah terkait hal ini, Anda dapat menghubungi kami disini.
Related Posts
Disqus Comments
© Copyright 2017 GENERAL INFO FOR ANDROID DEVELOPMENT - All Rights Reserved - Template Created by goomsite - Proudly powered by Blogger