WTransform WTransform::adjoint() const
{
return WTransform(m33() * m22() - m32() * m23(),
- (m33() * m12() - m32() * m13()),
- (m33() * m21() - m31() * m23()),
m33() * m11() - m31() * m13(),
m32() * m21() - m31() * m22(),
- (m32() * m11() - m31() * m12()));
}
WTransform& WTransform::rotateRadians(double angle)
{
double r11 = std::cos(angle);
double r12 = -std::sin(angle);
double r21 = -r12;
double r22 = r11;
// note: our public constructor is transposed!
return *this *= WTransform(r11, r21, r12, r22, 0, 0);
}
void WPainter::recalculateViewTransform()
{
viewTransform_ = WTransform();
double scaleX = viewPort_.width() / window_.width();
double scaleY = viewPort_.height() / window_.height();
viewTransform_.translate(viewPort_.x() - window_.x() * scaleX,
viewPort_.y() - window_.y() * scaleY);
viewTransform_.scale(scaleX, scaleY);
if (device_)
device_->setChanged(WPaintDevice::Transform);
}
void WPainter::drawPie(const WRectF& rectangle, int startAngle, int spanAngle)
{
WTransform oldTransform = WTransform(worldTransform());
translate(rectangle.center().x(), rectangle.center().y());
scale(1., rectangle.height() / rectangle.width());
WPainterPath path(WPointF(0.0, 0.0));
path.arcTo(0.0, 0.0, rectangle.width() / 2.0,
startAngle / 16., spanAngle / 16.);
path.closeSubPath();
drawPath(path);
setWorldTransform(oldTransform);
}
WTransform WTransform::inverted() const
{
double det = determinant();
if (det != 0) {
WTransform adj = adjoint();
return WTransform(adj.m11() / det, adj.m12() / det,
adj.m21() / det, adj.m22() / det,
adj.m31() / det, adj.m32() / det);
} else {
LOG_ERROR("inverted(): oops, determinant == 0");
return *this;
}
}
WTransform WTransform::adjoint() const
{
WTransform res = WTransform(m33() * m22() - m32() * m23(),
- (m33() * m12() - m32() * m13()),
- (m33() * m21() - m31() * m23()),
m33() * m11() - m31() * m13(),
m32() * m21() - m31() * m22(),
- (m32() * m11() - m31() * m12()));
if (isJavaScriptBound()) {
res.assignBinding(*this,
WT_CLASS ".gfxUtils.transform_adjoint(" + jsRef() + ")");
}
return res;
}
void WPainter::drawChord(const WRectF& rectangle, int startAngle, int spanAngle)
{
WTransform oldTransform = WTransform(worldTransform());
translate(rectangle.center().x(), rectangle.center().y());
scale(1., rectangle.height() / rectangle.width());
double start = startAngle / 16.;
double span = spanAngle / 16.;
WPainterPath path;
path.arcMoveTo(0, 0, rectangle.width()/2., start);
path.arcTo(0, 0, rectangle.width()/2., start, span);
path.closeSubPath();
drawPath(path);
setWorldTransform(oldTransform);
}
WTransform& WTransform::translate(double dx, double dy)
{
return *this *= WTransform(1, 0, 0, 1, dx, dy);
}
WTransform& WTransform::shear(double sh, double sv)
{
return *this *= WTransform(0, sv, sh, 0, 0, 0);
}
WTransform& WTransform::scale(double sx, double sy)
{
return *this *= WTransform(sx, 0, 0, sy, 0, 0);
}
