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本文章博客地址：https://hpzwl.blog.csdn.net/article/details/146068951

长沙红胖子Qt（长沙创微智科）博文大全：开发技术集合（包含Qt实用技术、树莓派、三维、OpenCV、OpenGL、ffmpeg、OSG、单片机、软硬结合等等）持续更新中…

Qt开发专栏：项目实战（点击传送门）

需求

  图像拼接需要过渡模板：
  1.预设四路渐进色拼接
  2.可单独一路或者多路，配合多图层算法，实现多路过度
  3.可调整点过渡位置，过渡间隙
  4.可调整点过渡颜色
  5.6路/8路拼接可通过调整点位置和多图层渐进色实现

背景

    公司自研产品过程中产出生产工具，无需求助美工或者懂切图，提升工作效率。

Demo：gardientColorTool_v1.0.0 windows运行包

  

  

  

  

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核心源码

void GradientPainterWidget::paintEvent(QPaintEvent *event)
{QPainter painter(this);// 绘制背景颜色drawBackground(&painter);drawImage(&painter);drawPoint(&painter);QWidget::paintEvent(event);
}void GradientPainterWidget::drawBackground(QPainter *painter)
{painter->save();painter->setPen(Qt::NoPen);painter->setBrush(_backgroundColor);painter->drawRect(rect());painter->restore();
}void GradientPainterWidget::drawImage(QPainter *painter)
{if(_image.isNull()){LOG << "if(_image.isNull())";return;}painter->save();painter->drawImage(rect(), _image);painter->restore();
}void GradientPainterWidget::drawPoint(QPainter *painter)
{painter->save();painter->setPen(Qt::NoPen);painter->setBrush(QColor(0, 0, 0, 255));for(int index = 0; index < _listInterPointF.size(); index++){painter->drawEllipse(_listInterPointF.at(index), _offset, _offset);}painter->restore();
}void GradientPainterWidget::updatePoint()
{// 求交点_listInterPointF.clear();for(int index = 0; index < _listAngle.size(); index++){double degrees = _listAngle.at(index);// 中心点延伸线double x = rect().center().x() - sin(qDegreesToRadians(degrees)) * rect().width();double y = rect().center().y() - cos(qDegreesToRadians(degrees)) * rect().width();QLineF line(QPoint(x, y), rect().center());
//        LOG << degrees << QPoint(x, y);for(int lineIndex = 0; lineIndex < _listBoundLineF.size(); lineIndex++){
//            LOG << line << _listBoundLineF.at(lineIndex);QPointF interPos(0, 0);QLineF::IntersectType type = _listBoundLineF.at(lineIndex).intersect(line, &interPos);if(type == QLineF::BoundedIntersection){
//                LOG << "inter" << interPos;_listInterPointF.append(interPos);break;}}}
}void GradientPainterWidget::updateImage()
{if(_image.isNull()){LOG << "if(_image.isNull())";return;}_image = QImage(rect().width(), rect().height(), QImage::Format_ARGB32);QConicalGradient conicalGradient;conicalGradient.setCenter(rect().center());conicalGradient.setAngle(90);conicalGradient.setColorAt(0.0, _color0);conicalGradient.setColorAt(1.0, _color0);conicalGradient.setColorAt(_angle  / 360, _color);conicalGradient.setColorAt(_angle2 / 360, _color2);conicalGradient.setColorAt(_angle3 / 360, _color3);conicalGradient.setColorAt(_angle4 / 360, _color4);conicalGradient.setColorAt(_angle5 / 360, _color5);conicalGradient.setColorAt(_angle6 / 360, _color6);conicalGradient.setColorAt(_angle7 / 360, _color7);conicalGradient.setColorAt(_angle8 / 360, _color8);QPainter painter(&_image);painter.setPen(Qt::NoPen);painter.setBrush(conicalGradient);painter.drawRect(rect());update();
}

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