Graphics Example2 in Android

This example shows Arc effects of graphics in android.

Algorithm:

1.) Create a new project by File-> New -> Android Project name it GraphicsExample2.

2.) Run for output.

Steps:

1.) Create a project named GraphicsExample2 and set the information as stated in the image.

Build Target: Android 4.0
Application Name: GraphicsExample2
Package Name: com. example. GraphicsExample2
Activity Name: GraphicsExample2Activity
Min SDK Version: 14

2.) Open GraphicsExample2Activity.java file and write following code there:

package com.example.GraphicsExample2;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.view.View;

public class GraphicsExample2Activity extends Activity {
/** Called when the activity is first created. */

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}

private static class SampleView extends View {
private Paint[] mPaints;
private Paint mFramePaint;
private boolean[] mUseCenters;
private RectF[] mOvals;
private RectF mBigOval;
private float mStart;
private float mSweep;
private int mBigIndex;

private static final float SWEEP_INC = 2;
private static final float START_INC = 15;

public SampleView(Context context) {
super(context);

mPaints = new Paint[4];
mUseCenters = new boolean[4];
mOvals = new RectF[4];

mPaints[0] = new Paint();
mPaints[0].setAntiAlias(true);
mPaints[0].setStyle(Paint.Style.FILL);
mPaints[0].setColor(0x88FF0000);
mUseCenters[0] = false;

mPaints[1] = new Paint(mPaints[0]);
mPaints[1].setColor(0x8800FF00);
mUseCenters[1] = true;

mPaints[2] = new Paint(mPaints[0]);
mPaints[2].setStyle(Paint.Style.STROKE);
mPaints[2].setStrokeWidth(4);
mPaints[2].setColor(0x880000FF);
mUseCenters[2] = false;

mPaints[3] = new Paint(mPaints[2]);
mPaints[3].setColor(0×88888888);
mUseCenters[3] = true;

mBigOval = new RectF(40, 10, 280, 250);

mOvals[0] = new RectF( 10, 270,  70, 330);
mOvals[1] = new RectF( 90, 270, 150, 330);
mOvals[2] = new RectF(170, 270, 230, 330);
mOvals[3] = new RectF(250, 270, 310, 330);

mFramePaint = new Paint();
mFramePaint.setAntiAlias(true);
mFramePaint.setStyle(Paint.Style.STROKE);
mFramePaint.setStrokeWidth(0);
}

private void drawArcs(Canvas canvas, RectF oval, boolean useCenter,
Paint paint) {
canvas.drawRect(oval, mFramePaint);
canvas.drawArc(oval, mStart, mSweep, useCenter, paint);
}

@Override protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);

drawArcs(canvas, mBigOval, mUseCenters[mBigIndex],
mPaints[mBigIndex]);

mSweep += SWEEP_INC;
if (mSweep > 360) {
mSweep -= 360;
mStart += START_INC;
if (mStart >= 360) {
mStart -= 360;
}
mBigIndex = (mBigIndex + 1) % mOvals.length;
}
invalidate();
}
}
}

3.) Compile and build the project.

Output

Thanks

akm

www.cdacians.com