Qt画k线图

Qt画k线图

一个从excel读取数据到绘制成图标的控件，

#include "painterkwidget.h"#include PainterKWidget::PainterKWidget(QWidget *parent) : QWidget(parent){ background = QColor(255,255,255); lineState = true; dataSize = 0; maxnum = 0; mixnum = 0; m_width = 0; m_height = 0; paint_width = 0; paint_height = 0; textHeight = 0; leftWidth = 0; rightWidth = 0; coordinate = false; space_w = 0; space_h = 0; count_x = 10; //坐标 分成10成 count_y = 10; //坐标 分成10成 range_x_start = 0; range_y_start = 0; range_x_end = 100; range_y_end = 100;}void PainterKWidget::paintEvent(QPaintEvent *e){ //绘制准备工作,启用反锯齿 QPainter painter(this); painter.setRenderHints(QPainter::Antialiasing); paintInit(&painter); //绘制背景 drawBg(&painter); //绘制标尺 drawAxis(&painter); //绘制数据 drawData(&painter);}void PainterKWidget::drawBg(QPainter *painter){ painter->fillRect(this->rect(), background);}void PainterKWidget::drawData(QPainter *painter){ painter->setBrush(QColor(255,25,44));//设置填充 painter->translate(leftWidth+5,2.5 * textHeight);//移动 float mincurrent = 0;//计算当前最小值 float linecurrent = 0;//计算当前最小值 for(int i = 0; i < dataSize;i++){ if(points.at(i).y1 < points.at(i).y2){//这里的大于小于代表着方向 mincurrent = points.at(i).y2; }else{ mincurrent = points.at(i).y1; }//这里我们取的最大值 mincurrent -= range_y_start; float currentHeight = points.at(i).h;//绘图高度 //这里就需要减去全数据最小值mixnum painter->drawRect((float)i*space_w*2,paint_height - (mincurrent)*space_h,space_w,currentHeight*space_h); //下面是划线 if(lineState == true){ linecurrent = (points.at(i).y2 + points.at(i).y1) / (float)2; linecurrent -= range_y_start; painter->drawLine((float)i*space_w*2,paint_height - (linecurrent)*space_h,((float)i+1)*space_w*2,paint_height - (linecurrent)*space_h); } }}void PainterKWidget::drawAxis(QPainter *painter){ QFontMetrics metrics = painter->fontMetrics(); // 绘制外框 painter->setBrush(QBrush("white")); painter->drawRect(0, 0, this->size().width() -1, this->size().height() - 1); //　移动坐标系 painter->translate(leftWidth, m_height - 1.5 * textHeight); float totalCount_Y = range_y_end - range_y_start; // 默认值差 float totalCount_X = range_x_end - range_x_start; // 默认值差 float deltaX = paint_width / count_x; // x坐标上每分的宽度 float deltaY = (float)paint_height / count_y; // y坐标上每分的宽度 // 画横坐标 if(coordinate == false){ painter->drawLine(0, 0, paint_width, 0); for (int i = 1; i <= totalCount_X; ++i) { QString month = QString("%1").arg(QString::number(i * totalCount_X / count_x,'f',0)); float stringWidth = metrics.width(month); // 绘制坐标刻度 painter->drawLine(deltaX * i, 0, deltaX * i, 4); // 绘制坐标处的月 float monthX = deltaX * (i - 1) + ((deltaX - stringWidth)); painter->drawText(monthX, textHeight, month); } }else{ painter->drawLine(0, -paint_height, paint_width, -paint_height); for (int i = 1; i <= totalCount_X; ++i) { QString month = QString("%1").arg(QString::number(i * totalCount_X / count_x,'f',0)); float stringWidth = metrics.width(month); // 绘制坐标刻度 painter->drawLine(deltaX * i, -paint_height, deltaX * i, -paint_height + 4); // 绘制坐标处的月 float monthX = deltaX * (i - 1) + ((deltaX - stringWidth)) ; painter->drawText(deltaX * i - 20, -paint_height - 4,month); } } // 画纵坐标 painter->drawLine(0, 0, 0, -paint_height); //画上面H painter->drawText(-metrics.width(tr("(y)")), -(deltaY * count_y + textHeight / 2 + metrics.descent()), tr("H")); //画刻度 for (int i = 1; i <= count_y; ++i) { QString value = QString("%1").arg(QString::number(i * totalCount_Y / count_y + range_y_start,'f',0)); int stringWidth = metrics.width(value); // 绘制坐标刻度 painter->drawLine(-4, -i * deltaY, 0, -i * deltaY); // 绘制坐标值 painter->drawText(-stringWidth - 4, -(deltaY * i + textHeight / 2 - metrics.ascent()), value); } painter->resetTransform();}void PainterKWidget::resizeEvent(QResizeEvent *event){ m_width = this->width(); m_height = this->height();}void PainterKWidget::wheelEvent(QWheelEvent *event){}void PainterKWidget::mousePressEvent(QMouseEvent *event){}void PainterKWidget::mouseReleaseEvent(QMouseEvent *event){}void PainterKWidget::mouseMoveEvent(QMouseEvent *event){}void PainterKWidget::setCount_x(float value){ count_x = value; update();}void PainterKWidget::setCount_y(float value){ count_y = value; update();}void PainterKWidget::setRange_x(float value_start,float value_end){ range_x_start = value_start; range_x_end = value_end; update();}void PainterKWidget::setRange_y(float value_start,float value_end){ range_y_start = value_start; range_y_end = value_end; update();}void PainterKWidget::setCoordinate(bool value){ coordinate = value; update();}void PainterKWidget::setLineState(bool value){ lineState = value; update();}

#ifndef PAINTERKWIDGET_H#define PAINTERKWIDGET_H#include #include #include #include #include #include #include #include class PointParam{public: float y1; float y2; float center; float h; float w;};class PainterKWidget : public QWidget{ Q_OBJECTpublic: explicit PainterKWidget(QWidget *parent = 0);signals:protected: virtual void paintEvent(QPaintEvent *); //绘图事件 void drawBg(QPainter *painter); //画背景 void drawScaleLine(QPainter *painter); //画刻度 void drawData(QPainter *painter); //画数据 void drawAxis(QPainter *painter); //画z坐标 void paintInit(QPainter *painter); //数据初始 virtual void resizeEvent(QResizeEvent *event); //重写虚函数获取事件 virtual void wheelEvent(QWheelEvent *event); //重写虚函数获取事件 virtual void mousePressEvent(QMouseEvent *event)Q_DECL_OVERRIDE; //重写虚函数获取事件 virtual void mouseReleaseEvent(QMouseEvent *event)Q_DECL_OVERRIDE; //重写虚函数获取事件 virtual void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE; //重写虚函数获取事件public slots: void setData(QVector); void setCount_x(float); void setCount_y(float); void setRange_x(float,float); void setRange_y(float,float); void setCoordinate(bool ); void setLineState(bool );private: QVector points; //数据 QVector linePoints; //划线点 QColor background; //背景颜色 float dataSize; //数据大小 float maxnum; //最大值 float mixnum; //最小值 float disparity; //值差 float m_width; //控件宽度 float m_height; //控件高度 float paint_width; //绘图宽度 float paint_height; //绘图高度 float textHeight; //文本高度 float leftWidth; //左边宽度 float rightWidth; //右边宽度 float space_w; //间隔宽度 float space_h; //间隔高度 float count_x; //坐标 分成10层 float count_y; //坐标 分成10层 float range_x_start; //坐标 范围 float range_y_start; //坐标 范围 float range_x_end; //坐标 范围 float range_y_end; //坐标 范围 bool coordinate; //x坐标在上还是下 bool lineState; //划线状态};#endif // PAINTERKWIDGET_H

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