Android Open Source - android-whogoesfirst Arrow View

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License

The source code is released under:

MIT License

Java Source Code

package com.idunnolol.whogoesfirst;
/*from w ww.j a va2  s  . co  m*/
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.Region;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.View;

public class ArrowView extends View {

  private Region mClipRegion;

  private Paint mArrowPaint;
  private Path mArrowPath;
  private Region mArrowRegion;

  private TextPaint mTextPaint;
  private Rect mBounds;
  private Region mTextRegion;

  private int mWidth;
  private int mHeight;

  private int mMultiplier = 0;

  private int mRotation;

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

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

  public ArrowView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    mArrowPaint = new Paint();
    mArrowPaint.setColor(context.getResources().getColor(R.color.holo_blue_light));
    mArrowPaint.setStyle(Style.FILL);
    mArrowPaint.setAntiAlias(true);

    mTextPaint = new TextPaint();
    mTextPaint.setColor(Color.WHITE);
    mTextPaint.setStyle(Style.FILL);
    mTextPaint.setAntiAlias(true);
    mTextPaint.setTextAlign(Align.CENTER);

    mArrowPath = new Path();
    mBounds = new Rect();

    mClipRegion = new Region();
    mArrowRegion = new Region();
    mTextRegion = new Region();
  }

  public void setMultiplier(int multiplier) {
    mMultiplier = multiplier;

    invalidate();
  }

  public void setArrowRotation(int rotation) {
    mRotation = rotation;
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    mWidth = w;
    mHeight = h;
    mClipRegion.set(0, 0, w, h);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    canvas.save();
    canvas.rotate(mRotation, mWidth / 2, mHeight / 2);

    // Draw an arrow
    mArrowPath.rewind();
    mArrowPath.moveTo(0, mHeight / 2);
    mArrowPath.lineTo(mWidth / 2, 0);
    mArrowPath.lineTo(mWidth, mHeight / 2);
    mArrowPath.lineTo(mWidth * 3 / 4, mHeight / 2);
    mArrowPath.lineTo(mWidth * 3 / 4, mHeight);
    mArrowPath.lineTo(mWidth / 4, mHeight);
    mArrowPath.lineTo(mWidth / 4, mHeight / 2);
    mArrowPath.lineTo(0, mHeight / 2);

    canvas.drawPath(mArrowPath, mArrowPaint);

    canvas.restore();

    // Draw a multiplier (if non-zero)
    if (mMultiplier > 0) {
      String text = getContext().getString(R.string.multiplier_TEMPLATE, mMultiplier);

      // We need to adapt the text size to the space we have (and also
      // find out its height so we can properly center align it)
      mTextPaint.setTextSize(Math.min(mWidth, mHeight) / 3.5f);
      mArrowRegion.setPath(mArrowPath, mClipRegion);

      getTextRegion(text);
      while (mArrowRegion.op(mTextRegion, Region.Op.REVERSE_DIFFERENCE) && mTextPaint.getTextSize() > 1) {
        mTextPaint.setTextSize(mTextPaint.getTextSize() - 1);
        getTextRegion(text);
      }

      canvas.drawText(text, mWidth / 2.0f, (mHeight + mBounds.height()) / 2.0f, mTextPaint);
    }
  }

  private void getTextRegion(String text) {
    mTextPaint.getTextBounds(text, 0, text.length(), mBounds);
    mTextRegion.set((int) (mBounds.left + (mWidth / 2.0f) - mBounds.width() / 2.0f),
        (int) (mBounds.top + (mHeight + mBounds.height()) / 2.0f),
        (int) (mBounds.right + (mWidth / 2.0f) - mBounds.width() / 2.0f),
        (int) (mBounds.bottom + (mHeight + mBounds.height()) / 2.0f));
  }
}

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