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- package pro.izcali.u4drawing;
- 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.view.MotionEvent;
- import android.view.View;
- /**
- * Created by urksi on 31/10/2017.
- */
- public class CanvasDrawing extends View {
- private Bitmap mBitmap;
- private Canvas mCanvas;
- private Path mPath;
- private Paint mBitmapPaint;
- private Paint mPaint;
- public CanvasDrawing (Context c) {
- super(c);
- mPath = new Path();
- mBitmapPaint = new Paint(Paint.DITHER_FLAG);
- mPaint = new Paint();
- mPaint.setAntiAlias(true);
- mPaint.setDither(true);
- mPaint.setColor(0xFF000000);
- mPaint.setStyle(Paint.Style.STROKE);
- mPaint.setStrokeJoin(Paint.Join.ROUND);
- mPaint.setStrokeCap(Paint.Cap.ROUND);
- mPaint.setStrokeWidth(3);
- }
- @Override
- protected void onSizeChanged(int w, int h, int oldw, int oldh) {
- super.onSizeChanged(w, h, oldw, oldh);
- mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
- mCanvas = new Canvas(mBitmap);
- }
- @Override
- protected void onDraw(Canvas canvas) {
- canvas.drawColor(Color.WHITE);
- canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
- canvas.drawPath(mPath, mPaint);
- }
- private float mX, mY;
- private static final float TOUCH_TOLERANCE = 4;
- private void touch_start(float x, float y) {
- mPath.reset();
- mPath.moveTo(x, y);
- mX = x;
- mY = y;
- }
- private void touch_move(float x, float y) {
- float dx = Math.abs(x - mX);
- float dy = Math.abs(y - mY);
- if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
- mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
- mX = x;
- mY = y;
- }
- }
- private void touch_up() {
- mPath.lineTo(mX, mY);
- // commit the path to our offscreen
- mCanvas.drawPath(mPath, mPaint);
- // kill this so we don't double draw
- mPath.reset();
- }
- @Override
- public boolean onTouchEvent(MotionEvent event) {
- float x = event.getX();
- float y = event.getY();
- switch (event.getAction()) {
- case MotionEvent.ACTION_DOWN:
- touch_start(x, y);
- invalidate();
- break;
- case MotionEvent.ACTION_MOVE:
- touch_move(x, y);
- invalidate();
- break;
- case MotionEvent.ACTION_UP:
- touch_up();
- invalidate();
- break;
- }
- return true;
- }
- public void clear(){
- mBitmap.eraseColor(Color.TRANSPARENT);
- invalidate();
- System.gc();
- }
- public void setBackground(int white) {
- }
- }
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