优秀企业网站,seo从入门到精通,wordpress在那个文件夹,app开发必须要网站吗QT图形视图系统 - 终篇
接上一篇#xff0c;我们需要继续完成以下的效果#xff1b;
先上个效果图#xff1a; 修改背景#xff0c;使之整体适配
上一篇我们绘制了标尺#xff0c;并且我们修改了放大缩小和对应的背景#xff0c;整体看来#xff0c;我们的滚动条会和…QT图形视图系统 - 终篇
接上一篇我们需要继续完成以下的效果
先上个效果图 修改背景使之整体适配
上一篇我们绘制了标尺并且我们修改了放大缩小和对应的背景整体看来我们的滚动条会和背景不搭配因此我们需要修改我们的背景这里使用qss修改;并且我们把之前的背景也写到这个里面。
style1.qss
QGraphicsView
{background: #000000;
}QScrollBar:horizontal {border: none;background: #000000;height: 15px;
}
QScrollBar::handle:horizontal {background: white;min-width: 20px;
}
QScrollBar::add-line:horizontal {border: none;background: #000000;width: 0px;
}QScrollBar::sub-line:horizontal {border: none;background: #000000;width: 0px;subcontrol-position: left;subcontrol-origin: margin;
}
/*QScrollBar:left-arrow:horizontal, QScrollBar::right-arrow:horizontal {*/
/* border: 2px solid grey;*/
/* width: 3px;*/
/* height: 3px;*/
/* background: white;*/
/*}*/QScrollBar::add-page:horizontal, QScrollBar::sub-page:horizontal {background: none;
}QScrollBar:vertical {border: none;background: #000000;width: 15px;border-bottom: 1px solid red;
}
QScrollBar::handle:vertical {background: white;min-height: 20px;
}
QScrollBar::add-line:vertical {border: none;background: #000000;height: 0px;subcontrol-position: bottom;subcontrol-origin: margin;
}QScrollBar::sub-line:vertical {border: none;background: #000000;height: 0px;subcontrol-position: top;subcontrol-origin: margin;
}
QScrollBar:up-arrow:vertical, QScrollBar::down-arrow:vertical {border: 2px solid grey;width: 3px;height: 3px;background: white;
}QScrollBar::add-page:vertical, QScrollBar::sub-page:vertical {background: none;
}
然后我们加载这个qss即可 将之前设置qss的地方修改成读取这个文件
QFile file(:/resources/qss/style1.qss);
file.open(QIODevice::ReadOnly);
// 设置软件背景色
setStyleSheet(QString(file.readAll()));
file.close();绘制对应刻度的线条
QGraphicsView有两个函数一个是绘制背景色一个是绘制前景色。我们的样条实际上绘制的是背景色因此我们需要重写这两个函数
void drawForeground(QPainter* painter, const QRectF rect) override;
void drawBackground(QPainter* painter, const QRectF rect) override;去掉之前再scene中添加的文字我们接下来开始绘制
背景没有什么好说的直接绘制成黑色的就可以
void GraphicsView::drawBackground(QPainter *painter, const QRectF rect)
{painter-fillRect(rect, Qt::black);// QGraphicsView::drawBackground(painter, rect);
}接下来我们通过前景色来绘制刻度线
constexpr int32_t uScale 100000;
constexpr double dScale 1.0 / uScale;
static std::unordered_mapint, int gridLinesX, gridLinesY;void GraphicsView::drawForeground(QPainter *painter, const QRectF rect)
{// fixme 这个地方需要修改成按照单位转换的double scale pow(10.0, ceil(log10(8.0 / h_ruler_-zoom())));double lineWidth {0};gridLinesX.clear(), gridLinesY.clear();const QColor color[4] {{255, 0, 0, 127}, // 0处使用红色绘制QColor(100, 100, 100, 50), // Grid1QColor(100, 100, 100, 150), // Grid5QColor(100, 100, 100, 255), // Grid10};double y, x;draw(scale * 0.1, rect, x, y);draw(scale * 0.5, rect, x, y);draw(scale * 1.0, rect, x, y);gridLinesX[0] 0;gridLinesY[0] 0;static QVectorQLineF lines[4];for (auto vec : lines)vec.clear();double tmp {};for (auto [x, colorIndex] : gridLinesX) {tmp x * dScale;lines[colorIndex].push_back(QLineF(tmp, rect.top(), tmp, rect.bottom()));}for (auto [y, colorIndex] : gridLinesY) {tmp y * dScale;lines[colorIndex].push_back(QLineF(rect.left(), tmp, rect.right(), tmp));}painter-save();painter-setRenderHint(QPainter::Antialiasing, false);int colorIndex {};for (auto vec : lines) {painter-setPen({color[colorIndex], lineWidth});painter-drawLines(vec.data(), vec.size());}auto width { rect.width() };auto height { rect.height() };painter-setPen({Qt::yellow, 0.0});painter-drawLine(QLineF {point_.x() - width, point_.y(), point_.x() width, point_.y()});painter-drawLine(QLineF {point_.x(), point_.y() - height, point_.x(), point_.y() height});painter-restore();
}void GraphicsView::draw(double sc, const QRectF rect, double x, double y)
{if (sc 1.0) {int top floor(rect.top());int left floor(rect.left());y top - top % int(sc);x left - left % int(sc);} else {const double k 1.0 / sc;int top floor(rect.top()) * k;int left floor(rect.left()) * k;y (top - top % int(k)) / k;x (left - left % int(k)) / k;}for (const auto end_ rect.bottom(); y end_; y sc)gridLinesY[ceil(y * uScale)];for (const auto end_ rect.right(); x end_; x sc)gridLinesX[ceil(x * uScale)];
}这样我们便有了网格线
下面的函数是对ruler和鼠标移动时候的操作
void GraphicsView::updateRuler()
{updateSceneRect(QRectF()); //QPoint p mapFromScene(QPointF());v_ruler_-setOrigin(p.y());h_ruler_-setOrigin(p.x());v_ruler_-setRulerZoom(qAbs(transform().m22() * 0.1));h_ruler_-setRulerZoom(qAbs(transform().m11() * 0.1));update();
}void GraphicsView::mouseMoveEvent(QMouseEvent *event)
{QGraphicsView::mouseMoveEvent(event);v_ruler_-setCursorPos(event-pos());h_ruler_-setCursorPos(event-pos());point_ mapToScene(event-pos());emit sig_mouseMove(event-pos());update();
}我们之前对鼠标样式进行了修改这个里面也不要忘记将View中的鼠标修改成十字 展示的是主要代码并不是全部代码如果需要全部代码请联系博主获取
