void uiDrawMatrixTranslate(uiDrawMatrix *m, double x, double y)
{
BAffineTransform a;
m2a(m, &a);
a.TranslateBy(x, y);
a2m(&a, m);
}
void
Leaves::Draw(BView* view, int32 frame)
{
float scale = fLeafSize / kLeafWidth / (kMaximumLeafSize * 2);
scale *= view->Bounds().Width();
scale += scale * drand48() * fSizeVariation / 100.;
BAffineTransform transform;
transform.TranslateBy(-kLeafWidth / 2, -kLeafHeight / 2);
// draw the leaf centered on the point
transform.RotateBy(drand48() * 2. * M_PI);
if ((rand() & 64) == 0) transform.ScaleBy(-1., 1.);
// flip half of the time
transform.ScaleBy(scale);
transform.TranslateBy(_RandomPoint(view->Bounds()));
BPoint center = transform.Apply(BPoint(kLeafWidth / 2, kLeafHeight / 2));
BPoint gradientOffset = BPoint(60 * scale, 80 * scale);
BGradientLinear gradient(center - gradientOffset, center + gradientOffset);
int color = (rand() / 7) % kColorCount;
gradient.AddColor(kColors[color][0], 0.f);
gradient.AddColor(kColors[color][1], 255.f);
BShape leafShape;
leafShape.MoveTo(transform.Apply(kLeafBegin));
for (int i = 0; i < kLeafCurveCount; ++i) {
BPoint control[3];
for (int j = 0; j < 3; ++j)
control[j] = transform.Apply(kLeafCurves[i][j]);
leafShape.BezierTo(control);
}
leafShape.Close();
view->PushState();
view->SetDrawingMode(B_OP_ALPHA);
view->SetHighColor(0, 0, 0, 50);
for (int i = 2; i >= 0; --i) {
view->SetOrigin(i * 0.1, i * 0.3);
view->SetPenSize(i * 2);
view->StrokeShape(&leafShape);
}
view->PopState();
view->FillShape(&leafShape, gradient);
}
const BAffineTransform&
BAffineTransform::SetScale(double x, double y)
{
double tx;
double ty;
double rotation;
double shearX;
double shearY;
if (!GetAffineParameters(&tx, &ty, &rotation, NULL, NULL,
&shearX, &shearY)) {
return *this;
}
BAffineTransform result;
result.ShearBy(shearX, shearY);
result.ScaleBy(x, y);
result.RotateBy(rotation);
result.TranslateBy(tx, ty);
return *this = result;
}