GrapgicsView_employ，qtcharts使用

#include "XYAxis.h" #include <cmath> #include <QtMath> #include <QDebug> XYAxis::XYAxis(QObject *parent) : QObject(parent) { } void XYAxis::init(AxisPosition position, double minLimit, double maxLimit, double minRange, double minValue, double maxValue) { this->thePosition = position; this->minLimit = minLimit; this->maxLimit = maxLimit; this->minRange = minRange; this->minValue = minValue; this->maxValue = maxValue; } XYAxis::AxisPosition XYAxis::getAxisPosition() const { return thePosition; } void XYAxis::setAxisPosition(AxisPosition position) { if (thePosition != position) { thePosition = position; emit axisChanged(); } } XYAxis::TickMode XYAxis::getTickMode() const { return theMode; } void XYAxis::setTickMode(TickMode mode) { if (theMode != mode) { theMode = mode; calcAxis(); } } QRect XYAxis::getRect() const { return theRect; } void XYAxis::setRect(const QRect &rect) { if (theRect != rect && rect.isValid()) { theRect = rect; calcAxis(); } } int XYAxis::getDecimalPrecision() const { return decimalPrecision; } void XYAxis::setDecimalPrecision(int precison) { if (decimalPrecision != precison) { decimalPrecision = precison; emit axisChanged(); } } double XYAxis::getFixedValueSpace() const { return fixedValueSpace; } void XYAxis::setFixedValueSpace(double value) { fixedValueSpace = value; calcAxis(); } int XYAxis::getRefPixelSpace() const { return refPixelSpace; } void XYAxis::setRefPixelSpace(int pixel) { refPixelSpace = pixel; calcAxis(); } QVector<int> XYAxis::getTickPos() const { return tickPos; } QVector<QString> XYAxis::getTickLabel() const { return tickLabel; } double XYAxis::getMinLimit() const { return minLimit; } double XYAxis::getMaxLimit() const { return maxLimit; } double XYAxis::getMinRange() const { return minRange; } double XYAxis::getMinValue() const { return minValue; } double XYAxis::getMaxValue() const { return maxValue; } double XYAxis::getUnit1PxToValue() const { return unit1PxToValue; } double XYAxis::getUnit1ValueToPx() const { return unit1ValueToPx; } double XYAxis::pxToValue(double px) const { return px * unit1PxToValue + minValue; } double XYAxis::valueToPx(double value) const { return (value - minValue) * unit1ValueToPx; } void XYAxis::draw(QPainter *painter) { painter->fillRect(theRect, QColor(0, 180, 200)); switch (this->getAxisPosition()) { case AtRight: //drawRight(painter); break; case AtLeft: drawLeft(painter); break; case AtTop: //drawTop(painter); break; case AtBottom: drawBottom(painter); break; default: break; } } void XYAxis::drawLeft(QPainter *painter) { painter->save(); painter->drawLine(theRect.topRight(), theRect.bottomRight()); const int right_pos = theRect.right(); for (int i = 0; i < tickPos.count(); i++) { const int y_pos = tickPos.at(i); painter->drawLine(QPoint(right_pos, y_pos), QPoint(right_pos - 5, y_pos)); painter->drawText(right_pos - 5 - painter->fontMetrics().boundingRect(tickLabel.at(i)).width(), y_pos + painter->fontMetrics().height() / 2, tickLabel.at(i)); } painter->restore(); } void XYAxis::drawBottom(QPainter *painter) { painter->save(); painter->drawLine(theRect.topLeft(), theRect.topRight()); const int top_pos = theRect.top(); for (int i = 0; i < tickPos.count(); i++) { const int x_pos = tickPos.at(i); painter->drawLine(QPoint(x_pos, top_pos), QPoint(x_pos, top_pos + 5)); painter->drawText(x_pos - painter->fontMetrics().boundingRect(tickLabel.at(i)).width() / 2, top_pos + 5 + painter->fontMetrics().height(), tickLabel.at(i)); } painter->restore(); } void XYAxis::calcAxis() { if (minLimit >= maxLimit || theRect.isNull()) return; if (minValue > maxValue) { std::swap(minValue, maxValue); } if (minLimit > minValue) { minValue = minLimit; } if (maxLimit < maxValue) { maxValue = maxLimit; } switch (this->getAxisPosition()) { case AtBottom: { //横向x轴 calcSpace(theRect.width() - 1); //计算刻度线 const double right_pos = theRect.right(); tickPos.clear(); tickLabel.clear(); const int precision = getTickPrecision(); //i是用刻度px算坐标位置；j是用刻度px算i对应的value //条件i>pos-N是为了显示最大值那个刻度 for (double i = theRect.left() + pxStart, j = pxStart; i < right_pos + 2; i += pxSpace, j += pxSpace) { tickPos.push_back(std::round(i)); const double label_value = (minValue + (j)*unit1PxToValue); QString label_text = QString::number(label_value, 'f', precision); if (label_text == "-0") { //会有-0 label_text = "0"; } tickLabel.push_back(label_text); } } break; case AtLeft: { //竖向y轴 calcSpace(theRect.height() - 1); //计算刻度线 const double top_pos = theRect.top(); tickPos.clear(); tickLabel.clear(); const int precision = getTickPrecision(); //i是用刻度px算坐标位置；j是用刻度px算i对应的value //条件i>pos-N是为了显示最大值那个刻度 for (double i = theRect.bottom() - pxStart, j = pxStart; i > top_pos - 2; i -= pxSpace, j += pxSpace) { tickPos.push_back(std::round(i)); const double label_value = (minValue + (j)*unit1PxToValue); QString label_text = QString::number(label_value, 'f', precision); if (label_text == "-0") { //会有-0 label_text = "0"; } tickLabel.push_back(label_text); } } break; default: break; } emit axisChanged(); } void XYAxis::calcSpace(double axisLength) { //计算每单位值 //为什么算了两个互为倒数的数呢？因为浮点数精度问题 unit1PxToValue = (maxValue - minValue) / (axisLength); unit1ValueToPx = (axisLength) / (maxValue - minValue); //计算间隔和起点 //计算刻度间隔及刻度起点 switch (theMode) { case FixedValue: //该模式ValueSpace固定不变; valueSpace = fixedValueSpace; pxSpace = calcPxSpace(unit1PxToValue, valueSpace); pxStart = calcPxStart(unit1PxToValue, valueSpace, minValue, maxValue); break; case RefPixel: valueSpace = calcValueSpace(unit1PxToValue, refPixelSpace); pxSpace = calcPxSpace(unit1PxToValue, valueSpace); pxStart = calcPxStart(unit1PxToValue, valueSpace, minValue, maxValue); break; default: break; } } double XYAxis::calcPxSpace(double unitP2V, double valueSpace) const { //这里与真0.0比较 if (unitP2V <= 0.0) { qWarning() << __FUNCTION__ << "unitP2V is too min" << unitP2V; return 30.0; } return valueSpace / unitP2V; } double XYAxis::calcPxStart(double unitP2V, double valueSpace, double valueMin, double valueMax) const { Q_UNUSED(valueMax) if (unitP2V <= 0.0 || valueSpace <= 0.0) {