Qt图形编程基础之：实验内容——使用Qt编写“Hello，World”程序

, white);

cg.setColor(QColorGroup::Background, white);

cg.setColor(QColorGroup::Shadow, black);

cg.setColor(QColorGroup::Highlight, black);

cg.setColor(QColorGroup::HighlightedText, white);

pal.setActive(cg);

cg.setColor(QColorGroup::Foreground, black);

cg.setColor(QColorGroup::Button, QColor(192, 192, 192));

cg.setColor(QColorGroup::Light, white);

cg.setColor(QColorGroup::Midlight, QColor(220, 220, 220));

cg.setColor(QColorGroup::Dark, QColor(96, 96, 96));

cg.setColor(QColorGroup::Mid, QColor(128, 128, 128));

cg.setColor(QColorGroup::Text, black);

cg.setColor(QColorGroup::BrightText, white);

cg.setColor(QColorGroup::ButtonText, black);

cg.setColor(QColorGroup::Base, white);

cg.setColor(QColorGroup::Background, white);

cg.setColor(QColorGroup::Shadow, black);

cg.setColor(QColorGroup::Highlight, black);

cg.setColor(QColorGroup::HighlightedText, white);

pal.setInactive(cg);

cg.setColor(QColorGroup::Foreground, QColor(128, 128, 128));

cg.setColor(QColorGroup::Button, QColor(192, 192, 192));

cg.setColor(QColorGroup::Light, white);

cg.setColor(QColorGroup::Midlight, QColor(220, 220, 220));

cg.setColor(QColorGroup::Dark, QColor(96, 96, 96));

cg.setColor(QColorGroup::Mid, QColor(128, 128, 128));

cg.setColor(QColorGroup::Text, black);

cg.setColor(QColorGroup::BrightText, white);

cg.setColor(QColorGroup::ButtonText, QColor(128, 128, 128));

cg.setColor(QColorGroup::Base, white);

cg.setColor(QColorGroup::Background, white);

cg.setColor(QColorGroup::Shadow, black);

cg.setColor(QColorGroup::Highlight, black);

cg.setColor(QColorGroup::HighlightedText, white);

pal.setDisabled(cg);

setPalette(pal);

QFont f(FONT());

f.setFamily("adobe-helvetica");

f.setPointSize(29);

f.setBold(TRUE);

setFont(f);

setCaption(tr(""));

/* 以下是手动添加的代码 */

t = "Hello,World";

b = 0;

QTimer *timer = new QTimer(this);

connect(timer, SIGNAL(timeout()), SLOT(animate()));

timer->start(40);

}

/*

* Destroys the object and frees any allocated resources

*/

Hello::~Hello()

{

}

/* 以下至结尾是手动添加的代码 */

void Hello::animate()

{

b = (b + 1) & 15;

repaint(FALSE);

}

/*

Handles mouse button release events for the Hello widget.

We emit the clicked() signal when the mouse is released inside

the widget.

*/

void Hello::mouseReleaseEvent(QMouseEvent *e)

{

if (rect().contains(e->pos()))

emit clicked();

}

/* Handles paint events for the Hello widget.

Flicker-free update. The text is first drawn in the pixmap and the

pixmap is then blt'ed to the screen.

*/

void Hello::paintEvent(QPaintEvent *)

{

static int sin_tbl[16] = {0, 38, 71, 92, 100, 92,

71, 38, 0, -38, -71, -92, -100, -92, -71, -38};

if (t.isEmpty())

eturn;

/* 1: Compute some sizes, positions etc. */

QFontMetrics fm = FONTMetrics();

int w = fm.width(t) + 20;

int h = fm.height() * 2;

int pmx = width()/2 - w/2;

int pmy = height()/2 - h/2;

/* 2: Create the pixmap and fill it with the widget's background */

QPixmap pm(w, h);

pm.fill(this, pmx, pmy);

/* 3: Paint the pixmap. Cool wave effect */

QPainter p;

int x = 10;

int y = h/2 + fm.descent();

int i = 0;

p.begin(&pm);

p.setFont(FONT());

while (!t[i].isNull())

{

nt i16 = (b+i) & 15;

.setPen(QColor((15-i16)*16,255,255,QColor::Hsv));

wText(x, y-sin_tbl[i16]*h/800, t.mid(i,1), 1);

+= fm.width(t[i]);

+;

}

p.end();

/