Hi,all
I was using fltk2.0 r5864 on Windows.
I found a bug about scale transform error!
Can you discuss it?
For example, next code:
readimage(data , RGB, Rectangle(x, y, 200, 24));
push_matrix();
scale(1, 2);
drawimage(data, RGB, Rectangle(x, y+50, 200, 24));
pop_matrix();
Now, x = 20; y = 0;
When I trace drawimage to void Image::draw(const fltk::Rectangle& from,
const fltk::Rectangle& to) ,
I watch the Rectangle to, is: to {x_=20 y_=50 w_=200 ...} const
fltk::Rectangle &. this is my expectant.
Then run to "fltk::Rectangle R; fltk::transform(to,R);", I hope
Rectangle R is {20, 100, 200, 48}.
But I run into void fltk::transform(const Rectangle& from, Rectangle&
to),
float w = rintf(sqrtf(d1x*d1x+d2x*d2x)); // w is 200, it is ok.
x = floorf(x - (w+1)/2); // x is 19, why? it
is wrong.
float h = rintf(sqrtf(d1y*d1y+d2y*d2y)); // h is 48, it is
ok.
y = floorf(y - (h+1)/2); // y is 99, it's
wrong.
So I get the R, R{x_=19 y_=99 w_=200 ...} fltk::Rectangle, it's wrong.
Is this a bug?
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