QPainter 绘制图像

本文主要是介绍QPainter 绘制图像，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

自定义绘制

绘制圆环

void drawAnnulus(QPainter &painter, QRect rect, int start = 0, int end = 360, int width = 1, QColor color = QColor(0, 255, 0))
{QPainterPath path, path2;QRect outRect;QRect innerRect;outRect = rect;innerRect = QRect(rect.x() + width, rect.y() + width,rect.width() - 2 * width, rect.height() - 2 * width);painter.save();painter.fillRect(rect, Qt::black);painter.setPen(Qt::NoPen);painter.setBrush(color);path.moveTo(rect.center());path.arcTo(rect, start, end);painter.drawPath(path);path2.moveTo(innerRect.center());path2.arcTo(innerRect, 0, 360);painter.setBrush(Qt::black);painter.drawPath(path2);painter.restore();
}

1 画点

void drawPoint(const QPointF &position)
void drawPoint(const QPoint &position)
void drawPoint(int x, int y)
void drawPoints(const QPointF *points, int pointCount)
void drawPoints(const QPolygonF &points)
void drawPoints(const QPoint *points, int pointCount)
void drawPoints(const QPolygon &points)

2 画线

void drawLine(const QLineF &line)
void drawLine(const QLine &line)
void drawLine(int x1, int y1, int x2, int y2)
void drawLine(const QPoint &p1, const QPoint &p2)
void drawLine(const QPointF &p1, const QPointF &p2)
void drawLines(const QLineF *lines, int lineCount)
void drawLines(const QVector &lines)
void drawLines(const QPointF *pointPairs, int lineCount)
void drawLines(const QVector &pointPairs)
void drawLines(const QLine *lines, int lineCount)
void drawLines(const QVector &lines)
void drawLines(const QPoint *pointPairs, int lineCount)
void drawLines(const QVector &pointPairs)

3 画矩形

void drawRect(const QRectF &rectangle)
void drawRect(int x, int y, int width, int height)
void drawRect(const QRect &rectangle)
void drawRects(const QRectF *rectangles, int rectCount)
void drawRects(const QVector &rectangles)
void drawRects(const QRect *rectangles, int rectCount)
void drawRects(const QVector &rectangles)
void drawRoundedRect(const QRectF &rect, qreal xRadius, qreal yRadius, Qt::SizeMode mode = Qt::AbsoluteSize)
void drawRoundedRect(int x, int y, int w, int h, qreal xRadius, qreal yRadius, Qt::SizeMode mode = …)
void drawRoundedRect(const QRect &rect, qreal xRadius, qreal yRadius, Qt::SizeMode mode = …)

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