OpenGL模型控制（旋转、平移）

1.效果图

2.平移

首先做一个鼠标双击事件，表示平移模型对象，当然，我们需要遍历当前哪个模型对象被选中，才能进行该对象的平移操作。

void AXBOpemglWidget::mouseDoubleClickEvent(QMouseEvent *event)
{Q_UNUSED(event);if(m_modelMoving){//再次双击取消移动m_modelMoving=false;}elseforeach(auto modelInfo,m_Models){//双击启动移动if(modelInfo.isSelected==true)m_modelMoving=true;qDebug()<<modelInfo.name<<modelInfo.isSelected;}
}

开启平移后，重写鼠标移动事件，将物体的需要移动到的像素坐标转化为世界坐标。

void AXBOpemglWidget::mouseMoveEvent(QMouseEvent *event)
{makeCurrent();if(m_modelMoving){for(auto iter=m_Models.begin();iter!=m_Models.end();iter++){ModelInfo *modelInfo=&iter.value();if(!modelInfo->isSelected) continue;modelInfo->worldPos=QVector3D(worldPosFromViewPort(event->pos().x(),event->pos().y()));}}doneCurrent();
}

然后再绘制的时候，使用model.translate(modelInfo.worldPos)即可。

    foreach(auto modelInfo,m_Models){model.setToIdentity();model.translate(modelInfo.worldPos);model.rotate(modelInfo.pitch,QVector3D(1.0,0.0,0.0));model.rotate(modelInfo.yaw,QVector3D(0.0,1.0,0.0));model.rotate(modelInfo.roll,QVector3D(0.0,0.0,1.0));m_ShaderProgram.setUniformValue("model", model);modelInfo.model->Draw(m_ShaderProgram);}

3.旋转

首先判断当前的模型是否被选中。重写鼠标左键单击事件。

void AXBOpemglWidget::mousePressEvent(QMouseEvent *event)
{bool hasSelected=false;makeCurrent();lastPos=event->pos();if(event->buttons()&Qt::LeftButton){QVector4D wolrdPostion=worldPosFromViewPort(event->pos().x(),event->pos().y());mousePickingPos(QVector3D(wolrdPostion));for(QMap<QString, ModelInfo>::iterator iter=m_Models.begin();iter!=m_Models.end();iter++){ModelInfo *modelInfo=&iter.value();float r=(modelInfo->model->m_maxY-modelInfo->model->m_minY)/2;if(modelInfo->worldPos.distanceToPoint(QVector3D(wolrdPostion))<r&&!hasSelected){modelInfo->isSelected=true;hasSelected=true;}elsemodelInfo->isSelected=false;//            qDebug()<<modelInfo->worldPos.distanceToPoint(QVector3D(wolrdPostion))//             <<"<"<<r<<"="<<modelInfo->isSelected;}}doneCurrent();
}

重写鼠标移动事件，改变其欧拉角。

void AXBOpemglWidget::mouseMoveEvent(QMouseEvent *event)
{makeCurrent();if(m_modelMoving){for(auto iter=m_Models.begin();iter!=m_Models.end();iter++){ModelInfo *modelInfo=&iter.value();if(!modelInfo->isSelected) continue;modelInfo->worldPos=QVector3D(worldPosFromViewPort(event->pos().x(),event->pos().y()));}}elseif(event->buttons() & Qt::RightButton|| event->buttons() & Qt::LeftButton|| event->buttons() & Qt::MiddleButton){auto currentPos=event->pos();QPoint deltaPos=currentPos-lastPos;lastPos=currentPos;if(event->buttons() & Qt::RightButton)m_camera.ProcessMouseMovement(deltaPos.x(),-deltaPos.y());elsefor(auto iter=m_Models.begin();iter!=m_Models.end();iter++){ModelInfo *modelInfo=&iter.value();if(!modelInfo->isSelected) continue;if(event->buttons() & Qt::MiddleButton){modelInfo->roll+=deltaPos.x();}else if(event->buttons() & Qt::LeftButton){modelInfo->yaw+=deltaPos.x();modelInfo->pitch+=deltaPos.y();}}}doneCurrent();
}