Android -真实绘画和手指移动之间的距离

@Override
public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_MOVE:
            float x = event.getX();
            float y = event.getY();
            // 处理坐标
            break;
    }
    return true;
}

private float calculateDistance(float x1, float y1, float x2, float y2) {
    return (float) Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
}

private float lastX, lastY;

@Override
public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            lastX = event.getX();
            lastY = event.getY();
            break;
        case MotionEvent.ACTION_MOVE:
            float currentX = event.getX();
            float currentY = event.getY();
            float distance = calculateDistance(lastX, lastY, currentX, currentY);
            // 处理距离，例如累加总距离
            lastX = currentX;
            lastY = currentY;
            break;
    }
    return true;
}

private float totalDistance = 0;

@Override
public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            lastX = event.getX();
            lastY = event.getY();
            break;
        case MotionEvent:**ACTION_MOVE**:
            float currentX = event.getX();
            float currentY = event.getY();
            float distance = calculateDistance(lastX, lastY, currentX, currentY);
            totalDistance += distance;
            lastX = currentX;
            lastY = currentY;
            break;
    }
    return true;
}