QPainter基本绘图
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
private:
void myDrawFilledRect();
void myDrawTextureRect();
void myDrawGradient();
void total();
void myDrawShape(); //绘制基本图形
protected:
void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
public:
explicit Widget(QWidget *parent = 0);
~Widget();
private:
Ui::Widget *ui;
};
#endif // WIDGET_H
qidget.cpp
#include "widget.h"
#include "ui_widget.h"
#include <QPainter>
void Widget::myDrawFilledRect()
{//基本绘图
QPainter painter(this);//创建QPainter对象
painter.setRenderHint(QPainter::Antialiasing);//告诉绘图引擎应该在可能的情况下进行边的反锯齿绘制
painter.setRenderHint(QPainter::TextAntialiasing);//文字的反锯齿
int W=this->width(); //绘图区宽度
int H=this->height(); //绘图区高度
QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框
//设置画笔
QPen pen;
pen.setWidth(3); //线宽
pen.setColor(Qt::red); //划线颜色
//Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine
pen.setStyle(Qt::SolidLine);//线的类型，实线、虚线等
//Qt::FlatCap, Qt::SquareCap,Qt::RoundCap
pen.setCapStyle(Qt::FlatCap);//线端点样式
//Qt::MiterJoin,Qt::BevelJoin,Qt::RoundJoin,Qt::SvgMiterJoin
pen.setJoinStyle(Qt::BevelJoin);//线的连接点样式
painter.setPen(pen);
//设置画刷
// QPixmap texturePixmap(":images/images/texture.jpg");
QBrush brush;
brush.setColor(Qt::yellow); //画刷颜色
brush.setStyle(Qt::SolidPattern); //画刷填充样式
// brush.setStyle(Qt::TexturePattern); //画刷填充样式
// brush.setTexture(texturePixmap); //设置材质图片
painter.setBrush(brush);
//Qt::NoBrush,Qt::SolidPattern,Qt::Dense1Pattern,Qt::Dense2Pattern,..,Qt::Dense7Pattern,Qt::HorPattern
// Qt::VerPattern, Qt::CrossPattern, Qt::BDiagPattern,Qt::FDiagPattern,Qt::DiagCrossPattern,
// Qt::LinearGradientPattern,Qt::ConicalGradientPattern,Qt::RadialGradientPattern
// Qt::TexturePattern
//绘图
// painter.drawLine(rect.left(),rect.top(),rect.right(),rect.bottom());
painter.drawRect(rect); //只填充定义的渐变区域
// painter.drawRect(this->rect()); //填充更大区域，会有延展效果
// painter.fillRect(rect,Qt::red);
// painter.drawRoundRect(rect);
// painter.drawRoundedRect(rect,40,20);
// painter.drawEllipse(rect);
// painter.drawPolyline(points,9);
// painter.drawPolygon(points,9);
// painter.drawPoints(points,9);
// painter.translate(100,300);
// painter.drawPath(starPath);
// painter.translate(200,0);
// painter.drawPath(starPath);
// painter.translate(200,0);
// painter.drawPath(starPath);
// painter.drawArc(rect,30*16,80*16);
// painter.drawChord(rect,90*16,120*16);
// painter.drawPie(rect,90*16,120*16);
// painter.drawText(rect,"Hello, QT");
}
void Widget::myDrawTextureRect()
{
QPainter painter(this);//创建QPainter对象
painter.setRenderHint(QPainter::Antialiasing);//
painter.setRenderHint(QPainter::TextAntialiasing);//
int W=this->width(); //绘图区宽度
int H=this->height(); //绘图区高度
QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框
//设置画笔
QPen pen;
pen.setWidth(3); //线宽
pen.setColor(Qt::red); //划线颜色
//Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine
pen.setStyle(Qt::SolidLine);//线的类型，实线、虚线等
//Qt::FlatCap, Qt::SquareCap,Qt::RoundCap
pen.setCapStyle(Qt::FlatCap);//线端点样式
//Qt::MiterJoin,Qt::BevelJoin,Qt::RoundJoin,Qt::SvgMiterJoin
pen.setJoinStyle(Qt::BevelJoin);//线的连接点样式
painter.setPen(pen);
//设置画刷
QPixmap texturePixmap(":images/images/texture.jpg");
QBrush brush;
// brush.setColor(Qt::yellow); //画刷颜色
// brush.setStyle(Qt::SolidPattern); //画刷填充样式
brush.setStyle(Qt::TexturePattern); //画刷填充样式
brush.setTexture(texturePixmap); //设置材质图片
painter.setBrush(brush);
//绘图
painter.drawRect(rect); //只填充定义的渐变区域
}
void Widget::myDrawGradient()
{
QPainter painter(this);//创建QPainter对象
painter.setRenderHint(QPainter::Antialiasing);//
painter.setRenderHint(QPainter::TextAntialiasing);//
int W=this->width(); //绘图区宽度
int H=this->height(); //绘图区高度
QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框
//设置画笔
// QPen pen;
// pen.setStyle(Qt::NoPen);//线的类型，实线、虚线等
// painter.setPen(pen);
//线性渐变
// QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.bottom()); //对角线
QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.top());//从左到右
linearGrad.setColorAt(0,Qt::blue);//起点颜色
linearGrad.setColorAt(0.5,Qt::green);//起点颜色
linearGrad.setColorAt(1,Qt::red);//终点颜色
linearGrad.setSpread(QGradient::ReflectSpread); //展布模式
//QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread
painter.setBrush(linearGrad);
//径向渐变
// QRadialGradient radialGrad(W/2,H/2,qMax(W/8,H/8),W/2,H/2);
//// radialGrad.setColorAt(0,Qt::white);
// radialGrad.setColorAt(0,Qt::green);
// radialGrad.setColorAt(1,Qt::blue);
// radialGrad.setSpread(QGradient::ReflectSpread);
// //QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread
// painter.setBrush(radialGrad);
//圆锥型渐变
// QConicalGradient coniGrad(W/2,H/2,45);
// coniGrad.setColorAt(0,Qt::yellow);
// coniGrad.setColorAt(0.5,Qt::blue);
// coniGrad.setColorAt(1,Qt::green);
//// coniGrad.setSpread(QGradient::PadSpread); //对于锥形渐变不起作用
// painter.setBrush(coniGrad);
//绘图
// painter.drawRect(rect); //只填充定义的渐变区域
painter.drawRect(this->rect()); //填充更大区域，会有延展效果
}
void Widget::total()
{
QPainter painter(this);//创建QPainter对象
painter.setRenderHint(QPainter::Antialiasing);//
painter.setRenderHint(QPainter::TextAntialiasing);//
int W=this->width(); //绘图区宽度
int H=this->height(); //绘图区高度
QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框
// QPoint points[9]={
// QPoint(5*W/12,H/4),
// QPoint(7*W/12,H/4),
// QPoint(3*W/4,5*H/12),
// QPoint(3*W/4,7*H/12),
// QPoint(7*W/12,3*H/4),
// QPoint(5*W/12,3*H/4),
// QPoint(W/4,7*H/12),
// QPoint(W/4,5*H/12),
// QPoint(5*W/12,H/4)
// };
// QPainterPath path;
// path.addRect(rect);
// path.addEllipse(rect);
// path.moveTo(points[0]);
// path.lineTo(points[4]);
// path.moveTo(points[1]);
// path.lineTo(points[5]);
// path.moveTo(points[2]);
// path.lineTo(points[6]);
// path.moveTo(points[3]);
// path.lineTo(points[7]);
// painter.scale(width() / 100.0, height() / 100.0);
// painter.translate(50.0, 50.0);
// qreal R=100; //半径
// const qreal Pi=3.14159;
// qreal deg=Pi*72/180;//
// QPoint points[5]={
// QPoint(R,0),
// QPoint(R*std::cos(deg),-R*std::sin(deg)),
// QPoint(R*std::cos(2*deg),-R*std::sin(2*deg)),
// QPoint(R*std::cos(3*deg),-R*std::sin(3*deg)),
// QPoint(R*std::cos(4*deg),-R*std::sin(4*deg)),
// };
// QPainterPath starPath;
// starPath.moveTo(points[0]);
// starPath.lineTo(points[2]);
// starPath.lineTo(points[4]);
// starPath.lineTo(points[1]);
// starPath.lineTo(points[3]);
// starPath.closeSubpath();
//绘制曲线
// path.moveTo(points[0]);
// path.cubicTo(points[1],points[4],points[2]);
//设置字体
// QFont font;
// font.setPointSize(30);
// font.setBold(true);
// painter.setFont(font);
//设置画笔
QPen pen;
pen.setWidth(3); //线宽
pen.setColor(Qt::red); //划线颜色
//Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine
pen.setStyle(Qt::SolidLine);//线的类型，实线、虚线等
//Qt::FlatCap, Qt::SquareCap,Qt::RoundCap
pen.setCapStyle(Qt::FlatCap);//线端点样式
//Qt::MiterJoin,Qt::BevelJoin,Qt::RoundJoin,Qt::SvgMiterJoin
pen.setJoinStyle(Qt::BevelJoin);//线的连接点样式
painter.setPen(pen);
//设置画刷
// QPixmap texturePixmap(":images/images/texture.jpg");
QBrush brush;
brush.setColor(Qt::yellow); //画刷颜色
brush.setStyle(Qt::SolidPattern); //画刷填充样式
// brush.setStyle(Qt::TexturePattern); //画刷填充样式
// brush.setTexture(texturePixmap); //设置材质图片
painter.setBrush(brush);
//Qt::NoBrush,Qt::SolidPattern,Qt::Dense1Pattern,Qt::Dense2Pattern,..,Qt::Dense7Pattern,Qt::HorPattern
// Qt::VerPattern, Qt::CrossPattern, Qt::BDiagPattern,Qt::FDiagPattern,Qt::DiagCrossPattern,
// Qt::LinearGradientPattern,Qt::ConicalGradientPattern,Qt::RadialGradientPattern
// Qt::TexturePattern
//线性渐变
//// QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.bottom()); //对角线
// QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.top());//从左到右
// linearGrad.setColorAt(0,Qt::blue);//起点颜色
// linearGrad.setColorAt(0.5,Qt::blue);//起点颜色
// linearGrad.setColorAt(1,Qt::red);//终点颜色
// linearGrad.setSpread(QGradient::ReflectSpread); //展布模式
////QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread
// painter.setBrush(linearGrad);
//径向渐变
// QRadialGradient radialGrad(W/2,H/2,qMax(W/8,H/8),W/2,H/2);
//// radialGrad.setColorAt(0,Qt::white);
// radialGrad.setColorAt(0,Qt::green);
// radialGrad.setColorAt(1,Qt::blue);
// radialGrad.setSpread(QGradient::ReflectSpread);
// //QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread
// painter.setBrush(radialGrad);
//圆锥型渐变
// QConicalGradient coniGrad(W/2,H/2,45);
// coniGrad.setColorAt(0,Qt::yellow);
// coniGrad.setColorAt(0.5,Qt::blue);
// coniGrad.setColorAt(1,Qt::green);
//// coniGrad.setSpread(QGradient::PadSpread); //对于锥形渐变不起作用
// painter.setBrush(coniGrad);
//设置复合模式
// painter.setCompositionMode(QPainter::CompositionMode_SourceOver);//
// painter.translate(W/4,H/4);
// painter.rotate(30);
// painter.scale(0.5,0.5);
// painter.shear(0.1,0.5);
//绘图
// painter.drawLine(rect.left(),rect.top(),rect.right(),rect.bottom());
painter.drawRect(rect); //只填充定义的渐变区域
// painter.drawRect(this->rect()); //填充更大区域，会有延展效果
// painter.fillRect(rect,Qt::red);
// painter.drawRoundRect(rect);
// painter.drawRoundedRect(rect,40,20);
// painter.drawEllipse(rect);
// painter.drawPolyline(points,9);
// painter.drawPolygon(points,9);
// painter.drawPoints(points,9);
// painter.translate(100,300);
// painter.drawPath(starPath);
// painter.translate(200,0);
// painter.drawPath(starPath);
// painter.translate(200,0);
// painter.drawPath(starPath);
// painter.drawArc(rect,30*16,80*16);
// painter.drawChord(rect,90*16,120*16);
// painter.drawPie(rect,90*16,120*16);
// painter.drawText(rect,"Hello, QT");
// QPixmap pixmap;
// pixmap.load(":/images/images/qt.jpg");
// painter.drawPixmap(rect.left(),rect.top(),pixmap);
}
void Widget::myDrawShape()
{
QPainter painter(this);//创建QPainter对象
painter.setRenderHint(QPainter::Antialiasing);
painter.setRenderHint(QPainter::TextAntialiasing);
int W=this->width(); //绘图区宽度
int H=this->height(); //绘图区高度
//设置画笔
QPen pen;
pen.setWidth(3); //线宽
pen.setColor(Qt::black); //划线颜色
//Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine
pen.setStyle(Qt::SolidLine);//线的类型，实线、虚线等
//Qt::FlatCap, Qt::SquareCap,Qt::RoundCap
pen.setCapStyle(Qt::FlatCap);//线端点样式
//Qt::MiterJoin,Qt::BevelJoin,Qt::RoundJoin,Qt::SvgMiterJoin
pen.setJoinStyle(Qt::BevelJoin);//线的连接点样式
painter.setPen(pen);
//1. drawArc()
// QRect rect(W/4,H/4,W/2,H/2);
// int startAngle = 90 * 16; //起始90°
// int spanAngle = 90 * 16; //旋转90°
// painter.drawArc(rect, startAngle, spanAngle);
//2. drawChord()
// QRect rect(W/4,H/4,W/2,H/2);
// int startAngle = 90 * 16; //起始90°
// int spanAngle = 90 * 16; //旋转90°
// painter.drawChord(rect, startAngle, spanAngle);
//3.drawConvexPolygon()
// QPoint points[4]={
// QPoint(5*W/12,H/4),
//// QPoint(7*W/12,H/4),
// QPoint(3*W/4,5*H/12),
//// QPoint(3*W/4,7*H/12),
//// QPoint(7*W/12,3*H/4),
// QPoint(5*W/12,3*H/4),
//// QPoint(W/4,7*H/12),
// QPoint(W/4,5*H/12),
//// QPoint(5*W/12,H/4)
// };
// painter.drawConvexPolygon(points, 4);
//4. drawEllipse
// QRect rect(W/4,H/4,W/2,H/2);
// painter.drawEllipse(rect);
//5. drawImage
// QRect rect(W/4,H/4,W/2,H/2);
// QImage image(":images/images/qt.jpg");
// painter.drawImage(rect, image);
//6. drawLine
// QLine Line(W/4,H/4,W/2,H/2);
// painter.drawLine(Line);
//7. drawLines
// QRect rect(W/4,H/4,W/2,H/2);
// QVector<QLine> Lines;
// Lines.append(QLine(rect.topLeft(),rect.bottomRight()));
// Lines.append(QLine(rect.topRight(),rect.bottomLeft()));
// Lines.append(QLine(rect.topLeft(),rect.bottomLeft()));
// Lines.append(QLine(rect.topRight(),rect.bottomRight()));
// painter.drawLines(Lines);
// 8.QPainterPath
// QRect rect(W/4,H/4,W/2,H/2);
// QPainterPath path;
// path.addEllipse(rect);
// path.addRect(rect);
// painter.drawPath(path);
//9.drawPie
// QRect rect(W/4,H/4,W/2,H/2);
// int startAngle = 40 * 16;//起始40°
// int spanAngle = 120 * 16;//旋转120°
// painter.drawPie(rect, startAngle, spanAngle);
//10. drawPixmap
// QRect rect(W/4,H/4,W/2,H/2);
// QPixmap pixmap(":images/images/qt.jpg");
// painter.drawPixmap(rect, pixmap);
//11. drawPolygon
// QPoint points[]={
// QPoint(5*W/12,H/4),
// QPoint(3*W/4,5*H/12),
// QPoint(5*W/12,3*H/4),
// QPoint(2*W/4,5*H/12),
// };
// painter.drawPolygon(points, 4);
//12.drawPolyline
// QPoint points[]={
// QPoint(5*W/12,H/4),
// QPoint(3*W/4,5*H/12),
// QPoint(5*W/12,3*H/4),
// QPoint(2*W/4,5*H/12)
// };
// painter.drawPolyline(points, 4);
//13.drawRect
// QRect rect(W/4,H/4,W/2,H/2);
// painter.drawRect(rect);
//14.drawRect
// QRect rect(W/4,H/4,W/2,H/2);
// painter.drawRoundedRect(rect,20,20);
//14.drawRect
// QRect rect(W/4,H/4,W/2,H/2);
// QFont font;
// font.setPointSize(30);
// font.setBold(true);
// painter.setFont(font);
// painter.drawText (rect,"Hello,Qt");
//. eraseRect
// QRect rect(W/4,H/4,W/2,H/2);
// painter.eraseRect(rect);
//15. fillRect
QRect rect(W/4,H/4,W/2,H/2);
painter.fillRect (rect,Qt::green);
//16. fillPath
// QRect rect(W/4,H/4,W/2,H/2);
// QPainterPath path;
// path.addEllipse(rect);
// path.addRect(rect);
// painter.fillPath(path,Qt::red);
//17.drawPoint
// painter.drawPoint(QPoint(W/2,H/2));
//18. drawPoints
// QPoint points[]={
// QPoint(5*W/12,H/4),
// QPoint(3*W/4,5*H/12),
// QPoint(2*W/4,5*H/12)
// };
// painter.drawPoints(points, 3);
}
void Widget::paintEvent(QPaintEvent *event)
{
// 1. 基本绘图1，绘制一个填充矩形
// myDrawFilledRect();
// 2. 用材质图片填充一个矩形
// myDrawTextureRect();
//3. 渐变填充
// myDrawGradient();
//4. 绘制基本图形
myDrawShape();
// QPainter painter(this);//创建QPainter对象
// painter.setRenderHint(QPainter::Antialiasing);//
// painter.setRenderHint(QPainter::TextAntialiasing);//
// int W=this->width(); //绘图区宽度
// int H=this->height(); //绘图区高度
// QRect rect(W/4,H/4,W/2,H/2); //中间区域矩形框
//// QPoint points[9]={
//// QPoint(5*W/12,H/4),
//// QPoint(7*W/12,H/4),
//// QPoint(3*W/4,5*H/12),
//// QPoint(3*W/4,7*H/12),
//// QPoint(7*W/12,3*H/4),
//// QPoint(5*W/12,3*H/4),
//// QPoint(W/4,7*H/12),
//// QPoint(W/4,5*H/12),
//// QPoint(5*W/12,H/4)
//// };
//// QPainterPath path;
//// path.addRect(rect);
//// path.addEllipse(rect);
//// path.moveTo(points[0]);
//// path.lineTo(points[4]);
//// path.moveTo(points[1]);
//// path.lineTo(points[5]);
//// path.moveTo(points[2]);
//// path.lineTo(points[6]);
//// path.moveTo(points[3]);
//// path.lineTo(points[7]);
//// painter.scale(width() / 100.0, height() / 100.0);
//// painter.translate(50.0, 50.0);
//// qreal R=100; //半径
//// const qreal Pi=3.14159;
//// qreal deg=Pi*72/180;//
//// QPoint points[5]={
//// QPoint(R,0),
//// QPoint(R*std::cos(deg),-R*std::sin(deg)),
//// QPoint(R*std::cos(2*deg),-R*std::sin(2*deg)),
//// QPoint(R*std::cos(3*deg),-R*std::sin(3*deg)),
//// QPoint(R*std::cos(4*deg),-R*std::sin(4*deg)),
//// };
//// QPainterPath starPath;
//// starPath.moveTo(points[0]);
//// starPath.lineTo(points[2]);
//// starPath.lineTo(points[4]);
//// starPath.lineTo(points[1]);
//// starPath.lineTo(points[3]);
//// starPath.closeSubpath();
////绘制曲线
//// path.moveTo(points[0]);
//// path.cubicTo(points[1],points[4],points[2]);
////设置字体
//// QFont font;
//// font.setPointSize(30);
//// font.setBold(true);
//// painter.setFont(font);
////设置画笔
// QPen pen;
// pen.setWidth(3); //线宽
// pen.setColor(Qt::red); //划线颜色
// //Qt::NoPen,Qt::SolidLine, Qt::DashLine, Qt::DotLine,Qt::DashDotLine,Qt::DashDotDotLine,Qt::CustomDashLine
// pen.setStyle(Qt::SolidLine);//线的类型，实线、虚线等
// //Qt::FlatCap, Qt::SquareCap,Qt::RoundCap
// pen.setCapStyle(Qt::FlatCap);//线端点样式
// //Qt::MiterJoin,Qt::BevelJoin,Qt::RoundJoin,Qt::SvgMiterJoin
// pen.setJoinStyle(Qt::BevelJoin);//线的连接点样式
// painter.setPen(pen);
////设置画刷
//// QPixmap texturePixmap(":images/images/texture.jpg");
// QBrush brush;
// brush.setColor(Qt::yellow); //画刷颜色
// brush.setStyle(Qt::SolidPattern); //画刷填充样式
//// brush.setStyle(Qt::TexturePattern); //画刷填充样式
//// brush.setTexture(texturePixmap); //设置材质图片
// painter.setBrush(brush);
////Qt::NoBrush,Qt::SolidPattern,Qt::Dense1Pattern,Qt::Dense2Pattern,..,Qt::Dense7Pattern,Qt::HorPattern
//// Qt::VerPattern, Qt::CrossPattern, Qt::BDiagPattern,Qt::FDiagPattern,Qt::DiagCrossPattern,
//// Qt::LinearGradientPattern,Qt::ConicalGradientPattern,Qt::RadialGradientPattern
//// Qt::TexturePattern
////线性渐变
////// QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.bottom()); //对角线
//// QLinearGradient linearGrad(rect.left(),rect.top(),rect.right(),rect.top());//从左到右
//// linearGrad.setColorAt(0,Qt::blue);//起点颜色
//// linearGrad.setColorAt(0.5,Qt::blue);//起点颜色
//// linearGrad.setColorAt(1,Qt::red);//终点颜色
//// linearGrad.setSpread(QGradient::ReflectSpread); //展布模式
//////QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread
//// painter.setBrush(linearGrad);
////径向渐变
//// QRadialGradient radialGrad(W/2,H/2,qMax(W/8,H/8),W/2,H/2);
////// radialGrad.setColorAt(0,Qt::white);
//// radialGrad.setColorAt(0,Qt::green);
//// radialGrad.setColorAt(1,Qt::blue);
//// radialGrad.setSpread(QGradient::ReflectSpread);
//// //QGradient::PadSpread ,QGradient::RepeatSpread, QGradient::ReflectSpread
//// painter.setBrush(radialGrad);
////圆锥型渐变
//// QConicalGradient coniGrad(W/2,H/2,45);
//// coniGrad.setColorAt(0,Qt::yellow);
//// coniGrad.setColorAt(0.5,Qt::blue);
//// coniGrad.setColorAt(1,Qt::green);
////// coniGrad.setSpread(QGradient::PadSpread); //对于锥形渐变不起作用
//// painter.setBrush(coniGrad);
////设置复合模式
//// painter.setCompositionMode(QPainter::CompositionMode_SourceOver);//
//// painter.translate(W/4,H/4);
//// painter.rotate(30);
//// painter.scale(0.5,0.5);
//// painter.shear(0.1,0.5);
////绘图
//// painter.drawLine(rect.left(),rect.top(),rect.right(),rect.bottom());
// painter.drawRect(rect); //只填充定义的渐变区域
//// painter.drawRect(this->rect()); //填充更大区域，会有延展效果
//// painter.fillRect(rect,Qt::red);
//// painter.drawRoundRect(rect);
//// painter.drawRoundedRect(rect,40,20);
//// painter.drawEllipse(rect);
//// painter.drawPolyline(points,9);
//// painter.drawPolygon(points,9);
//// painter.drawPoints(points,9);
//// painter.translate(100,300);
//// painter.drawPath(starPath);
//// painter.translate(200,0);
//// painter.drawPath(starPath);
//// painter.translate(200,0);
//// painter.drawPath(starPath);
//// painter.drawArc(rect,30*16,80*16);
//// painter.drawChord(rect,90*16,120*16);
//// painter.drawPie(rect,90*16,120*16);
//// painter.drawText(rect,"Hello, QT");
//// QPixmap pixmap;
//// pixmap.load(":/images/images/qt.jpg");
//// painter.drawPixmap(rect.left(),rect.top(),pixmap);
}
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
setPalette(QPalette(Qt::white));//设置窗口为白色背景
setAutoFillBackground(true);
this->resize(400,400);
}
Widget::~Widget()
{
delete ui;
}
主要是给自己看的，所以肯定会出现很多错误哈哈哈哈哈
