Android Open Source - basicpainting Drawing View

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License

The source code is released under:

MIT License

Java Source Code

package com.fabulousoft.basicpainting;
/* w ww . j a  v  a  2s  . com*/
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuffXfermode;
import android.graphics.PorterDuff;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;

public class DrawingView extends View {

  private Path drawPath;
  private Paint drawPaint, canvasPaint;
  private int paintColor = 0xFF660000;
  private Canvas drawCanvas;
  private Bitmap canvasBitmap;
  private float brushSize, lastBrushSize;
  private boolean erase = false;

  public DrawingView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setupDrawing();
  }

  private void setupDrawing() {
    brushSize = getResources().getInteger(R.integer.medium_size);
    lastBrushSize = brushSize;
    drawPath = new Path();
    drawPaint = new Paint();
    drawPaint.setColor(paintColor);
    drawPaint.setAntiAlias(true);
    drawPaint.setStrokeWidth(lastBrushSize);
    drawPaint.setStyle(Paint.Style.STROKE);
    drawPaint.setStrokeJoin(Paint.Join.ROUND);
    drawPaint.setStrokeCap(Paint.Cap.ROUND);
    canvasPaint = new Paint(Paint.DITHER_FLAG);
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    canvasBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    drawCanvas = new Canvas(canvasBitmap);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    canvas.drawBitmap(canvasBitmap, 0, 0, canvasPaint);
    canvas.drawPath(drawPath, drawPaint);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    float touchX = event.getX();
    float touchY = event.getY();
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
      drawPath.moveTo(touchX, touchY);
      break;
    case MotionEvent.ACTION_MOVE:
      drawPath.lineTo(touchX, touchY);
      break;
    case MotionEvent.ACTION_UP:
      drawCanvas.drawPath(drawPath, drawPaint);
      drawPath.reset();
      break;
    default:
      return false;
    }
    invalidate();
    return true;
  }

  public void setColor(String newColor) {
    invalidate();
    paintColor = Color.parseColor(newColor);
    drawPaint.setColor(paintColor);
  }

  public void setBrushSize(float newSize) {
    float pixelAmount = TypedValue.applyDimension(
        TypedValue.COMPLEX_UNIT_DIP, newSize, getResources()
            .getDisplayMetrics());
    brushSize = pixelAmount;
    drawPaint.setStrokeWidth(brushSize);
  }

  public void setLastBrushSize(float lastSize) {
    lastBrushSize = lastSize;
  }

  public float getLastBrushSize() {
    return lastBrushSize;
  }

  public void setErase(boolean isErase) {
    erase = isErase;
    if (erase) {
      drawPaint
          .setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
    } else {
      drawPaint.setXfermode(null);
    }
  }

  public void startNew() {
    drawCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
    invalidate();
  }
}

Java Source Code List

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