Android Open Source - glassless Level View

From Project

Back to project page glassless.

License

The source code is released under:

Apache License

If you think the Android project glassless listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/*
 * Copyright (C) 2013 Google Inc.//w w w.j  ava  2  s.c o m
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.glass.samples.level;

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

/**
 * View used to draw the level line.
 */
public class LevelView extends View {

  private Paint mPaint = new Paint();
  private float mAngle = 0.f;

  public LevelView(Context context) {
    this(context, null, 0);
  }

  public LevelView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public LevelView(Context context, AttributeSet attrs, int style) {
    super(context, attrs, style);

    mPaint.setColor(Color.BLUE);
    mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
    mPaint.setStrokeWidth(5);
  }

  /**
   * Set the angle of the level line.
   * 
   * @param angle Angle of the level line.
   */
  public void setAngle(float angle) {
    mAngle = angle;
    // Redraw the line.
    invalidate();
  }

  @Override
  public void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    int width = canvas.getWidth();
    int height = canvas.getHeight() / 2;

    // Compute the coordinates.
    float y = (float) Math.tan(mAngle) * width / 2;

    // Draw the level line.
    canvas.drawLine(0, y + height, width, -y + height, mPaint);
  }

}

Java Source Code List