新功能：设置QPainter笔刷样式

PaintingDemo/basicdrawing/renderarea.cpp

@@ -117,7 +117,7 @@ void RenderArea::drawPattern(QPainter &painter)
 {
     painter.save();
 
-    QRect rect(10, 20, 80, 60);
+    QRect rect(10, 20, 280, 260);
     static const QPoint points[4] = {
         QPoint(10, 80),
         QPoint(20, 10),
@@ -128,9 +128,9 @@ void RenderArea::drawPattern(QPainter &painter)
     int arcLength = 120 * 16;       // 弧线角度
     // 创建一个绘制路径
     QPainterPath path;
-    path.moveTo(20, 80);    // 移动开始点
+    path.moveTo(20, 180);    // 移动开始点
     path.lineTo(20, 30);    // 添加一条(80到30d)竖线
-    path.cubicTo(QPoint(80, 0), QPoint(50, 50), QPoint(80, 80)); // 添加一条曲线
+    path.cubicTo(QPoint(180, 0), QPoint(80, 80), QPoint(180, 180)); // 添加一条曲线
     switch (m_shape)
     {
     case Line:      // 绘制线段

PaintingDemo/basicdrawing/widget.cpp

@@ -148,10 +148,50 @@ void Widget::on_com_brushStyle_activated(int index)
 {
     Q_UNUSED(index)
     Qt::BrushStyle style = Qt::BrushStyle(ui->com_brushStyle->currentData().toInt());
-    QBrush brush;
-    brush.setStyle(style);
-    brush.setColor(Qt::red);
-    ui->widget->setBrush(brush);
+
+    switch (style)
+    {
+    case Qt::LinearGradientPattern:    // 添加线性渐变图案
+    {
+        QLinearGradient linearGradient(0, 0, 100, 100);
+        linearGradient.setColorAt(0.0, Qt::white);
+        linearGradient.setColorAt(0.2, Qt::green);
+        linearGradient.setColorAt(1.0, Qt::black);
+        ui->widget->setBrush(linearGradient);
+        break;
+    }
+    case Qt::RadialGradientPattern:   // 添加径向渐变图案
+    {
+        QRadialGradient radialGradient(50, 50, 50, 70, 70);
+        radialGradient.setColorAt(0.0, Qt::white);
+        radialGradient.setColorAt(0.2, Qt::green);
+        radialGradient.setColorAt(1.0, Qt::black);
+        ui->widget->setBrush(radialGradient);
+        break;
+    }
+    case Qt::ConicalGradientPattern:   // 添加锥形渐变图案
+    {
+        QConicalGradient conicalGradient(50, 50, 150);
+        conicalGradient.setColorAt(0.0, Qt::white);
+        conicalGradient.setColorAt(0.2, Qt::green);
+        conicalGradient.setColorAt(1.0, Qt::black);
+        ui->widget->setBrush(conicalGradient);
+        break;
+    }
+    case Qt::TexturePattern:           // 添加图片纹理笔刷
+    {
+        ui->widget->setBrush(QBrush(QPixmap("C:/Users/mhf/Pictures/grid.PNG")));
+        break;
+    }
+    default:
+    {
+        QBrush brush;
+        brush.setStyle(style);
+        brush.setColor(Qt::red);
+        ui->widget->setBrush(brush);
+        break;
+    }
+    }
 }
 
 /**