北龙建设集团有限公司企业网站怎么查看网站是用什么编程语言开发的
1、概述
源码放在文章末尾
该项目实现了带动画、带交互的折线图，包含如下特点：
动态增删数值
自适应显示坐标轴数值
鼠标悬浮显示十字对准线
鼠标靠近点自动贴附
支持直线与平滑曲线效果
自定义点的显示类型与大小
自适应点的数值显示位置
根据指定锚点缩放
平滑的横向移动
选中的纵向渐变效果
项目demo演示如下所示：
项目部分代码如下所示：
#ifndef LINECHART_H
#define LINECHART_H#include <QObject>
#include <QWidget>
#include <QList>
#include <QPainter>
#include <QPainterPath>
#include <QPropertyAnimation>
#include <QtMath>struct ChartData
{QString title;QColor color = Qt::black;int xMin = 0;int xMax = 0;int yMin = 0;int yMax = 0;QList<QPoint> points;QList<QString> xLabels; // X显示的名字，可空，比如日期
};struct Vector2D : public QPointF
{Vector2D(double x, double y) : QPointF(x, y){}Vector2D(QPointF p) : QPointF(p){}/// 向量长度double length(){return sqrt(x() * x() + y() * y());}/// 转单位向量Vector2D normalize(){double len = length();double inv;if (len < 1e-4)inv = 0;elseinv = 1 / length();return Vector2D(x() * inv, y() * inv);}/// 向量相加Vector2D operator+ (Vector2D v){return Vector2D(x() + v.x(), y() + v.y());}/// 向量翻倍Vector2D operator* (double f){return Vector2D(x() * f, y() * f);}/// 内积double dot(Vector2D v){return x() * v.x() + y() * v.y();}/// 两个向量夹角double angle(Vector2D v){return acos(dot(v) / (length() * v.length())) * 180 / M_PI;}
};class LineChart : public QWidget
{Q_OBJECTQ_PROPERTY(int display_x_min READ getDisplayXMin WRITE setDisplayXMin)Q_PROPERTY(int display_x_max READ getDisplayXMax WRITE setDisplayXMax)Q_PROPERTY(int display_y_min READ getDisplayYMin WRITE setDisplayYMin)Q_PROPERTY(int display_y_max READ getDisplayYMax WRITE setDisplayYMax)public:LineChart(QWidget *parent = nullptr);int lineCount() const;void setPointLineType(int t);void setPointValueType(int t);void setPointDotType(int t);void setPointDotRadius(int r);void setLabelSpacing(int s);void addLine(ChartData data);void removeLine(int index);void addPoint(int index, int x, int y);void addPoint(int index, int x, int y, const QString& label);void removeFirst(int index);void updateAnchors();void zoom(double prop);void moveHorizontal(int x);signals:void signalSelectRangeChanged(int start, int end);public slots:void zoomIn();void zoomOut();protected:void paintEvent(QPaintEvent *event) override;void enterEvent(QEvent *event) override;void leaveEvent(QEvent *event) override;void mouseMoveEvent(QMouseEvent *event) override;void mousePressEvent(QMouseEvent *event) override;void mouseReleaseEvent(QMouseEvent *event) override;void wheelEvent(QWheelEvent *event) override;private:void setDisplayXMin(int v);int getDisplayXMin() const;void setDisplayXMax(int v);int getDisplayXMax() const;void setDisplayYMin(int v);int getDisplayYMin() const;void setDisplayYMax(int v);int getDisplayYMax() const;void saveRange();void startRangeAnimation();QPropertyAnimation* startAnimation(const QByteArray &property, int start, int end, bool* flag, int duration = 300, QEasingCurve curve = QEasingCurve::OutQuad);int getValueByCursorPos(QPoint pos);private:// 数据QList<ChartData> datas; // 所有折线的数据// 界面QRect contentRect; // 显示的范围，实时刷新QRect paddings = QRect(32, 32, 32, 32); // 四周留白(width=right,height=bottom)QColor borderColor = Qt::gray; // 边界线颜色int labelSpacing = 2; // 标签间距// 信息显示bool autoResize = true; // 自动调整大小int displayXMin = 0, displayXMax = 0; // 显示的X轴范围int displayYMin = 0, displayYMax = 0; // 显示的Y轴范围bool usePointXLabels = true; // 优先使用点对应的label，还是相同间距的数值QList<QString> xLabels; // 显示的文字（可能少于值数量）QList<int> xLabelPoss;int pointLineType = 3; // 连线类型：1直线，2二次贝塞尔曲线，3三次贝塞尔曲线（更精确但吃性能）int pointValueType = 2; // 数值显示位置：0无，1强制上方，2自动附近int pointDotType = 1; // 圆点类型：0无，1空心圆，2实心圆，3小方块int pointDotRadius = 2; // 圆点半径// 动画效果bool enableAnimation = true;int _savedXMin, _savedXMax; // 修改前的数值int _savedYMin, _savedYMax;bool animatingXMin = false, animatingXMax = false; // 是否正在动画中bool animatingYMin = false, animatingYMax = false;int _animatedXMin, _animatedXMax; // 动画中的数值（仅影响显示）int _animatedYMin, _animatedYMax;// 交互数据bool pressing = false;QPoint pressPos, releasePos;bool hovering = false;QPoint hoverPos;int nearDis = 8; // 四周这些距离内算是“附近”// 悬浮提示bool showCrossOnPressing = true; // 按下显示十字对准线QColor hightlightColor = QColor("#FF7300"); // 高亮颜色// 鼠标选择bool enableSelect = true;bool selecting = false;int selectPos = 0; // 最后一次鼠标点击的X像素（相对显示矩形）int selectXStart = 0, selectXEnd = 0; // 鼠标按下/松开的对应X值位置QColor selectColor = QColor("#F08080"); // 选择区域颜色// 缩放(仅针对X轴)bool enableScale = true;int displayXStart = 0, displayXEnd = 0;
};#endif // LINECHART_H