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描画、元に戻す、やり直し、消しゴムをサポートするために必要な、図面のようなプロジェクトを作成したいと思います。消しゴムは、背景だけを削除するのではなく、図面ビューでのみ削除する必要があります以下のコードは、元に戻す機能とやり直し機能を実装しています。私は消しゴムオプションを追加したいが、それは行われていない。下のコードを使って消しゴムオプションを実装するにはアンドロイドキャンバスでアンドゥ、リドゥ、イレースを実装する方法
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.util.AttributeSet;
import android.view.MotionEvent;
import java.util.ArrayList;
public class CanvasView extends View {
private Paint mPenPainter;
public int width;
public int height;
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
Context context;
private Paint mPaint;
private float mX, mY;
private static final float TOLERANCE = 5;
private ArrayList<Path> paths = new ArrayList<Path>();
private ArrayList<Path> undonePaths = new ArrayList<Path>();
private int paintColor = 0xFF000000;
public CanvasView(Context c, AttributeSet attrs) {
super(c, attrs);
context = c;
// we set a new Path
mPath = new Path();
// and we set a new Paint with the desired attributes
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setColor(paintColor);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeWidth(4f);
//float mEraserWidth = getResources().getDimension(R.dimen.eraser_size);
mPenPainter = new Paint();
mPenPainter.setColor(Color.BLUE);
}
// override onSizeChanged
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// your Canvas will draw onto the defined Bitmap
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
// override onDraw
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// draw the mPath with the mPaint on the canvas when onDraw
for (Path p : paths) {
canvas.drawPath(p, mPaint);
}
canvas.drawPath(mPath, mPaint);
// paths.add(mPath);
}
private void startTouch(float x, float y) {
undonePaths.clear();
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
public void onClickUndo() {
if (paths.size() > 0) {
undonePaths.add(paths.remove(paths.size() - 1));
invalidate();
} else {
//Util.Imageview_undo_redum_Status=false;
}
//toast the user
}
public void onClickRedo() {
if (undonePaths.size() > 0) {
paths.add(undonePaths.remove(undonePaths.size() - 1));
invalidate();
} else {
// Util.Imageview_undo_redum_Status=false;
}
//toast the user
}
// when ACTION_MOVE move touch according to the x,y values
private void moveTouch(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOLERANCE || dy >= TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
}
}
private void upTouch() {
mPath.lineTo(mX, mY);
mPath.lineTo(mX, mY);
// commit the path to our offscreen
mCanvas.drawPath(mPath, mPaint);
// kill this so we don't double draw
paths.add(mPath);
mPath = new Path();
}
//override the onTouchEvent
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
float mCurX;
float mCurY;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mX = event.getX();
mY = event.getY();
startTouch(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
moveTouch(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
upTouch();
invalidate();
break;
}
return true;
}
アンドゥ以下を参照して、reduo iが同じコード – Android