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ユーザーが望むように画面に長方形を描きたいのですが、ユーザーのタッチイベントから長方形を描くためのポイントを取得するにはどうすればよいですか? onTouchEvent を使用して線を描画し、以下のようにペイントします。このように、ユーザーが望むように線を引く 長方形を描きたいのですが、これの値を取得できませんでした。助けてください

public class SimpleDrawingView extends View {
private final int paintColor = Color.BLACK;
private Paint drawPaint;
private Path path = new Path();
float pointX;
float pointY;

public SimpleDrawingView(Context context, AttributeSet attrs) {
    super(context, attrs);
    setFocusable(true);
    setFocusableInTouchMode(true);
    setupPaint();
}

private void setupPaint() {
    // Setup paint with color and stroke styles
    drawPaint = new Paint();
    drawPaint.setColor(paintColor);
    drawPaint.setAntiAlias(true);
    drawPaint.setStrokeWidth(5);
    drawPaint.setStyle(Paint.Style.STROKE);
    drawPaint.setStrokeJoin(Paint.Join.ROUND);
    drawPaint.setStrokeCap(Paint.Cap.ROUND);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
     pointX = event.getX();
     pointY = event.getY();
    // Checks for the event that occurs
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            path.moveTo(pointX, pointY);
            return true;
        case MotionEvent.ACTION_MOVE:
            path.lineTo(pointX, pointY);
            break;
        default:
            return false;
    }
    // Force a view to draw again
    postInvalidate();
    return true;
}
@Override
protected void onDraw(Canvas canvas) {
    canvas.drawPath(path,drawPaint);

}

}

4

2 に答える 2

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このようにすることもできます

public class SimpleDrawingView extends View {
private final int paintColor = Color.BLACK;
private Paint drawPaint;
float pointX;
float pointY;
float startX;
float startY;

public SimpleDrawingView(Context context, AttributeSet attrs) {
super(context, attrs);
setFocusable(true);
setFocusableInTouchMode(true);
setupPaint();
}

private void setupPaint() {
// Setup paint with color and stroke styles
drawPaint = new Paint();
drawPaint.setColor(paintColor);
drawPaint.setAntiAlias(true);
drawPaint.setStrokeWidth(5);
drawPaint.setStyle(Paint.Style.STROKE);
drawPaint.setStrokeJoin(Paint.Join.ROUND);
drawPaint.setStrokeCap(Paint.Cap.ROUND);
}

@Override
 public boolean onTouchEvent(MotionEvent event) {
pointX = event.getX();
pointY = event.getY();
// Checks for the event that occurs
switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
        startX = pointX;
        startY = pointY;
        return true;
    case MotionEvent.ACTION_MOVE:
        break;
    default:
        return false;
}
// Force a view to draw again
postInvalidate();
return true;
}

 @Override
 protected void onDraw(Canvas canvas) {
 canvas.drawRect(startX, startY, pointX, pointY, drawPaint);
  }
}
于 2016-05-26T09:25:55.393 に答える