#include"QtGui"
#include "histogram.h"
HistogramWidget::HistogramWidget(QWidget *parent) :
QWidget(parent)
{
m_BKColor = QColor( 255,255,255 );
m_VecPixmap.clear( );//清空堆栈
setAutoFillBackground( true );
setPalette( QPalette( m_BKColor ) );
setMinimumSize( 320, 240 );
adjustSize( );
}
void HistogramWidget::AddItem(QString name, quint32 value, QColor pillarColor)
{
HistogramItem item;
item.m_pillarName=name;
item.m_pillarValue=value;
item.m_pillarColor=pillarColor;
item.m_pillarRect=QRect();
m_VecItems.push_back( item );//把以上四项载入头文件中已声明的容积
}
void HistogramWidget::SetMaxValue(quint32 maxValue)
{
m_MaxValue=maxValue;//给y轴设置最大值，也即是给柱状图设置最大值
}
void HistogramWidget::paintEvent(QPaintEvent *)
{
QPainter painter(this);
DrawAxis(&painter);
DrawPillar(&painter);
DrawText(&painter);
DrawScale(&painter);
QFont font;//设置窗口部件的字体//
font.setPointSize(8);
setFont(font);//选择字体//
}
void HistogramWidget::DrawAxis(QPainter *painter)//绘制坐标轴
{
painter->drawLine(xAxisOffset,yAxisOffset,xAxisOffset,height());//绘制y轴
painter->drawLine(xAxisOffset,yAxisOffset,width(),yAxisOffset);//绘制x轴
}
void HistogramWidget::DrawPillar(QPainter *painter)//绘制柱子
{
if(m_VecItems.size()==0)return;//容积内没有封装任何东西返回
const quint32 blankWidth=0;
quint32 pillarWidth=(width()-xAxisOffset-pillarIndent)/12;//每个柱子的宽度
int m_MaxValue = 10;
float heightFact=(float)(height()-yAxisOffset)/(m_MaxValue);
for(int i=0;i<12;++i)
{
quint32 pillarHeight=m_VecItems.m_pillarValue*heightFact;
int leftUpX=xAxisOffset+pillarIndent+i*(pillarWidth+blankWidth);
int leftUpY=height()-yAxisOffset-pillarHeight;
QRect &rect=m_VecItems.m_pillarRect;
rect.setRect(leftUpX,leftUpY,pillarWidth,pillarHeight);//绘制柱状图
painter->setPen(QPen(m_VecItems.m_pillarColor));//为第i个柱状图设置颜色
painter->drawRect(rect);//在绘图版上进行绘图
}
}
void HistogramWidget::DrawText(QPainter *painter)//绘制文字
{
painter->setPen(QPen(QColor(0,0,0)));
for(int i=0;i<12;++i)
{
QRect rect(m_VecItems.m_pillarRect.left()-blankWidth/2,m_VecItems.m_pillarRect.top()-textRectHeight,
m_VecItems.m_pillarRect.width(),textRectHeight);
const QString &text=QString( "%1(%2)" ).arg( m_VecItems.m_pillarName).arg( m_VecItems.m_pillarValue);
painter->drawText(rect,Qt::AlignVCenter | Qt::AlignBottom,text);
}
}
void HistogramWidget::DrawScale(QPainter *painter)//为坐标组绘制刻度
{
const quint32 MSWidth=100;//为横轴设置刻度宽
const quint32 MSHeight=textRectHeight;//为纵轴设置刻度宽
const quint32 heightInterval=(height()-yAxisOffset)/10;
for(int i=0;i<10;++i)//y轴画刻度及标度刻度值
{
QRect rect(0,i*heightInterval,MSWidth,MSHeight);
painter->setPen(Qt::black);
painter->drawLine(yAxisOffset-2,i*heightInterval,yAxisOffset+2,i*heightInterval);//画刻度
painter->drawText(rect,Qt::AlignLeft,QString("%1").arg(m_MaxValue*(10-i)/10));//标记刻度值
}
for (int i = 1; i <= 12; ++i)//x轴画刻度
{
painter->setPen(Qt::black);
painter->drawLine(MSWidth * i,xAxisOffset-2,MSWidth* i, xAxisOffset+2);
}
}
void HistogramWidget ::DrawPixmaps( )
{
m_VecPixmap.clear( );
QPixmap pixmap( minimumSize( ) * 0.8 );//像素映射的大小调整为窗口闩大小的80%
pixmap.fill( QColor( 255, 255, 255 ) );//使用白色填充像素映射
m_VecPixmap.push_back( pixmap );
// 绘制一张像素图
HistogramWidget histogram;
histogram.SetMaxValue( 1000 );
histogram.AddItem( tr( "1" ), 100, QColor( 125, 0, 0 ) );
histogram.AddItem( tr( "2" ), 150, QColor( 0, 125, 0 ) );
histogram.AddItem( tr( "3" ), 200, QColor( 0, 0, 125 ) );
histogram.AddItem( tr( "4" ), 250, QColor( 125, 125, 125 ));
histogram.AddItem( tr( "5" ), 300, QColor( 125, 0, 0 ) );
histogram.AddItem( tr( "6" ), 350, QColor( 0, 125, 0 ) );
histogram.AddItem( tr( "7" ), 400, QColor( 0, 0, 125 ) );
histogram.AddItem( tr( "8" ), 450, QColor( 125, 125, 125 ));
histogram.AddItem( tr( "9" ), 500, QColor( 125, 0, 0 ) );
histogram.AddItem( tr( "10" ),750, QColor( 0, 125, 0 ) );
histogram.AddItem( tr( "11" ),800, QColor( 0, 0, 125 ) );
histogram.AddItem( tr( "12" ),950, QColor( 125, 125, 125 ));
QPainter painter(&pixmap);
painter.initFrom(this);//调用之前设置的画笔.背景及其字体
DrawPillar(&painter);//载入数据在窗口部件上执行绘图操作;
}
以上是我的.cpp文件的代码，望指正代码错误。
