void BarChartWidget::drawBars(QPainter &painter) {
std::vector<int> sizes(BAR_COUNT, 0);
fillSizes(sizes);
QRect baseRectangle = rect();
int activeWidth = (int) std::floor( baseRectangle.width() * (1 - 2 * PADDING) );
int singleBarWidth = (int) std::floor((activeWidth - (BAR_COUNT + 1) * SPACING) / BAR_COUNT);
int baseLineY = (int) std::floor(baseRectangle.bottom() - PADDING_BOTTOM);
int currX = (int) std::floor(baseRectangle.left() + baseRectangle.width() * PADDING);
currX += SPACING;
for (int i = 0; i < BAR_COUNT; i++) {
QPoint pointTopLeft(currX, baseLineY - sizes.at((unsigned long) i));
QPoint pointBottomRight(currX + singleBarWidth, baseLineY - 1);
QRect bar(pointTopLeft, pointBottomRight);
painter.setPen(mainColor);
painter.drawRect(bar);
painter.fillRect(bar, barColor);
QPoint textTopLeft(currX, baseLineY);
QPoint textBottomRight(currX + singleBarWidth, baseRectangle.bottom());
QRect textRect(textTopLeft, textBottomRight);
painter.setPen(mainColor);
painter.drawText(textRect, Qt::AlignCenter, labels->at((unsigned long) i));
QPoint valueTopLeft(currX, baseLineY - sizes.at((unsigned long) i) - VALUE_LABEL_HEIGHT);
QPoint valueBottomRight(currX + singleBarWidth, baseLineY);
QRect valueLabelRect(valueTopLeft, valueBottomRight);
QString textValue = QString::number(values->at((unsigned long) i));
painter.drawText(valueLabelRect, Qt::AlignHCenter | Qt::AlignTop, textValue);
currX += singleBarWidth + SPACING;
}
}
void ProgressBarColor::drawBar(QPainter *painter)
{
painter->save();
//自动计算文字字体大小
QFont f(font());
f.setPixelSize((width() / 10) * 0.35);
painter->setFont(f);
//计算进度值字符的宽度
double currentValue = (double)(value - minValue) * 100 / (maxValue - minValue);
QString strValue = QString("当前值:%1%").arg(currentValue, 0, 'f', precision);
QString strMaxValue = QString("%1%").arg(maxValue, 0, 'f', precision);
//字符的宽度取最大值字符的宽度 + 10
int textWidth = painter->fontMetrics().width(strMaxValue) + 10;
//绘制进度值背景
QPointF textTopLeft(width() - space - textWidth, space);
QPointF textBottomRight(width() - space, height() - space);
QRectF textRect(textTopLeft, textBottomRight);
painter->setPen(barBgColor);
painter->setBrush(barBgColor);
painter->drawRoundedRect(textRect, radius, radius);
//绘制进度值
painter->setPen(textColor);
painter->drawText(textRect, Qt::AlignCenter, strValue);
//绘制进度条背景
QRectF barBgRect(QPointF(space, space), QPointF(width() - space * 2 - textWidth, height() - space));
painter->setPen(Qt::NoPen);
painter->setBrush(barBgColor);
painter->drawRoundedRect(barBgRect, radius, radius);
//绘制进度条
double length = width() - space - space * 2 - textWidth;
//计算每一格移动多少
double increment = length / (maxValue - minValue);
QRectF barRect(QPointF(space, space), QPointF(space + increment * (value - minValue), height() - space));
painter->setBrush(barColor);
painter->drawRoundedRect(barRect, radius, radius);
//绘制背景分割线条 每一格长度7
painter->setPen(lineColor);
int initX = 5;
int lineCount = barBgRect.width() / step;
double lineX = (double)barBgRect.width() / lineCount;
//线条高度在进度条高度上 - 1
while (lineCount > 0) {
QPointF topPot(initX + lineX, space + 1);
QPointF bottomPot(initX + lineX, height() - space - 1);
painter->drawLine(topPot, bottomPot);
initX += lineX;
lineCount--;
}
painter->restore();
}