#pragma?execution_character_set（“utf-8“）

#include?“curvechart.h“
#include?“qpainter.h“
#include?“qdebug.h“

CurveChart::CurveChart（QWidget?*parent）?:?QWidget（parent）
{
????minValue?=?0;
????maxValue?=?100;
????xStep?=?10;
????yStep?=?10;

????space?=?40;
????title?=?“曲線圖“;
????showHLine?=?true;
????showPoint?=?true;
????showPointBg?=?true;

????bgColorStart?=?QColor（79?79?79）;
????bgColorEnd?=?QColor（51?51?51）;
????textColor?=?QColor（250?250?250）;
????pointColor?=?QColor（38?114?179）;
}

void?CurveChart::paintEvent（QPaintEvent?*）
{
????//繪制準(zhǔn)備工作啟用反鋸齒
????QPainter?painter（this）;
????painter.setRenderHints（QPainter::Antialiasing?|?QPainter::TextAntialiasing）;

????//繪制背景
????drawBg（&painter）;
????//繪制盒子
????drawBox（&painter）;
????//繪制文字
????drawText（&painter）;
????//繪制標(biāo)題
????drawtitle（&painter）;
????//繪制數(shù)據(jù)點
????drawPoint（&painter）;
}

void?CurveChart::drawBg（QPainter?*painter）
{
????painter->save（）;
????painter->setPen（Qt::NoPen）;
????QLinearGradient?topGradient（rect（）.topLeft（）?rect（）.bottomLeft（））;
????topGradient.setColorAt（0.0?bgColorStart）;
????topGradient.setColorAt（1.0?bgColorEnd）;
????painter->setBrush（topGradient）;
????painter->drawRect（rect（））;
????painter->restore（）;
}

void?CurveChart::drawBox（QPainter?*painter）
{
????painter->save（）;

????QPointF?topLeftPot（space?space）;
????QPointF?bottomRightPot（width（）?-?space?/?2?height（）?-?space?/?2）;
????painter->setPen（textColor）;
????painter->setBrush（Qt::NoBrush）;

????pointRect?=?QRectF（topLeftPot?bottomRightPot）;
????painter->drawRect（pointRect）;

????//繪制橫線
????if?（showHLine）?{
????????QPen?pen（textColor?1?Qt::DotLine）;
????????painter->setPen（pen）;

????????int?step?=?（maxValue?-?minValue）?/?xStep;
????????double?increment?=?（double）pointRect.height（）?/?step;
????????double?startY?=?pointRect.topLeft（）.y（）;

????????for?（int?i?=?0;?i?????????????startY?+=?increment;
????????????QPointF?leftPot（pointRect.topLeft（）.x（）?startY）;
????????????QPointF?rightPot（pointRect.topRight（）.x（）?startY）;
????????????painter->drawLine（leftPot?rightPot）;
????????}
????}

????painter->restore（）;
}

void?CurveChart::drawText（QPainter?*painter）
{
????painter->save（）;

????painter->setPen（textColor）;
????painter->setBrush（Qt::NoBrush）;

????int?step?=?（maxValue?-?minValue）?/?xStep;
????int?value?=?maxValue;
????double?increment?=?（double）pointRect.height（）?/?step;
????double?startY?=?pointRect.topLeft（）.y（）;
????QString?strValue;

????for?（int?i?=?0;?i?<=?step;?i++）?{
????????strValue?=?QString（“%1“）.arg（value）;
????????double?textWidth?=?fontMetrics（）.width（strValue）;
????????double?textHeight?=?fontMetrics（）.height（）;
????????QPointF?textPot（pointRect.topLeft（）.x（）?-?5?-?textWidth?startY?+?textHeight?/?2）;
????????painter->drawText（textPot?strValue）;
????????value?-=?xStep;
????????startY?+=?increment;
????}

????painter->restore（）;
}

void?CurveChart::drawTit

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-12-28?17:21??curvechart\
?????文件????????8734??2017-02-07?17:31??curvechart\curvechart.cpp
?????文件????????4149??2017-02-10?17:11??curvechart\curvechart.h
?????文件?????????468??2017-02-08?09:57??curvechart\curvechart.pro
?????文件???????23877??2017-12-28?17:21??curvechart\curvechart.pro.user
?????文件????????1797??2017-01-02?14:37??curvechart\frmcurvechart.cpp
?????文件?????????631??2016-12-13?17:18??curvechart\frmcurvechart.h
?????文件????????3614??2017-01-02?15:33??curvechart\frmcurvechart.ui
?????文件?????????546??2017-02-08?09:57??curvechart\main.cpp