在qt中设置背景颜色

Question

我有QGraphicsScene。在那个场景中，我有一个rects，我想在那个rects中设置不同的颜色。

我的代码是

QGraphicsScene* scene;
scene = new QGraphicsScene(this);
QGraphicsView* view;
view = new QGraphicsView(this);
view->setGeometry(x, y, mapColumns * min_height_size, mapRows * min_width_size);
view->setScene(scene);

for(int i=0; i<mapRows; ++i){
    for(int j=0; j<mapColumns; ++j){
        if (j == 0) {
            y = 20;
        }
        if(map.getCell(i,j).getTerrain() == Cell::forest) {
            scene->addRect(x,y,min_height_size,min_width_size);
            scene->setPalette(Qt::green);  //but it didn't work
            y += min_width_size;
        } else if(map.getCell(i,j).getTerrain() == Cell::mountain){
            scene->addRect(x,y,min_height_size,min_width_size);
            scene->setPalette(Qt::blue);   //but it didn't work
            y += min_width_size;
        } else if(map.getCell(i,j).getTerrain() == Cell::plain) {
            scene->addRect(x,y,min_height_size,min_width_size);
            scene->setPalette(Qt::yellow);  //but it didn't work
            y += min_width_size;
        }
        view->setDragMode(QGraphicsView::ScrollHandDrag);
    }
     x += min_height_size;
}
}

Answer 1

您可以使用setBrush()功能设置颜色。

QGraphicsRectItem *rect_item1 = scene->addRect(100, 100, 50, 50);
rect_item1->setBrush(Qt::yellow);
QGraphicsRectItem *rect_item2 = scene->addRect(200, 250, 50, 50);
rect_item2->setBrush(QColor(100,50,200));