Question

我想知道是否有人有诀窍将鼠标位置保持在Qt的（QGL）小部件中心。我读到可以在找到delta之后设置mouseposition，但这种方式对我来说非常麻烦。鼠标事件没有正确注册，如果它们发生了任何事情，那么它们会非常跳跃。

void World::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton) {

        GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
        GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();

        player->rotHorizontal += 360.0 * dx;
        if(player->rotHorizontal < 0.0)
            player->rotHorizontal += 360.0;
        else if(player->rotHorizontal > +360.0)
            player->rotHorizontal -= 360.0;

        player->rotVertical += 360.0 * dy;

        if (player->rotVertical > MAX_ROTATION_UP) {
            player->rotVertical = MAX_ROTATION_UP;
        } else if (player->rotVertical < -MAX_ROTATION_UP) {
            player->rotVertical = -MAX_ROTATION_UP;
        }

    }
//    int diffX = event->pos().x() - lastPos.x() % 20;
//    int diffY = event->pos().y() - lastPos.y() % 20;
//    if (diffY > 10 || diffX > 10 || diffY < -10 || diffX < -10) {
//        QPoint glob = mapToGlobal(QPoint(this->pos().x() + width()/2, this->pos().y() + height()/2));
//        QCursor::setPos(glob);
//    }
    lastPos = event->pos();
    QGLWidget::mouseMoveEvent(event);
}

我注释掉了将鼠标保持居中的代码。如果这样可行，我会把它放在左侧区域。

Answer 1

修正：

void World::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton) {

        GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
        GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();

        player->rotHorizontal += 360.0 * dx;
        if(player->rotHorizontal < 0.0)
            player->rotHorizontal += 360.0;
        else if(player->rotHorizontal > +360.0)
            player->rotHorizontal -= 360.0;

        player->rotVertical += 360.0 * dy;

        if (player->rotVertical > MAX_ROTATION_UP) {
            player->rotVertical = MAX_ROTATION_UP;
        } else if (player->rotVertical < -MAX_ROTATION_UP) {
            player->rotVertical = -MAX_ROTATION_UP;
        }

    }
    QPoint glob = mapToGlobal(QPoint(width()/2,height()/2));
    QCursor::setPos(glob);
    lastPos = QPoint(width()/2,height()/2);
    QGLWidget::mouseMoveEvent(event);
}

Qt保持鼠标居中

1 个答案: