Qt绘制文本二 弯曲排列和旋转效果 弧形路径 正弦函数路径

void WgtText::paintEvent(QPaintEvent *event)

{

QPainter painter(this);

QString m_string("abcdefghijklmnopqrstuvwxy");

int font_size = 15;

float x0 = font_size * m_string.count() * 0.5;

int YSize = font_size * m_string.count() * 0.5;

for(int i=0; i<m_string.count(); i++)

{

// 按圆弧函数绘制

painter.save();

float tAlpha = i*3.14/m_string.count();

float tx = YSize*cos(tAlpha) + YSize;

float ty = YSize*sin(tAlpha);

painter.translate(tx, ty); // 文字的位置

painter.rotate(180*i/(float)(m_string.count())); // 将文字本身旋转

painter.drawText(QPointF(-10.0, 10.0), QString("%1").arg(m_string[i]));

painter.restore();

}

}

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void WgtText::paintEvent(QPaintEvent *event)

{

QPainter painter(this);

int font_size = 10;

// 设置字符间距

int text_space = 2;

int wh = height();

QFont font;

font.setFamily("Microsoft YaHei");

// 大小

font.setPointSize(font_size);

// 使用字体

painter.setFont(font);

static QString m_string("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");

for(int i=0; i<m_string.count(); i++)

{

// 按正弦函数绘制

float tx = (font_size + text_space) * i;

float ty = sin(tx);

//压缩y坐标

ty = wh/2 + ty*(wh/2*0.2);

painter.drawText(QPointF(tx, ty), QString("%1").arg(m_string[i]));

}

return QWidget::paintEvent(event);

}