Am 20.09.2013 um 12:24 schrieb Igor Stasenko <siguc...@gmail.com>:
>
>
>
> On 20 September 2013 12:15, Norbert Hartl <norb...@hartl.name> wrote:
> Next try. I may do something stupid but it appears that all morphs draw on
> the same coordinate system. Meaning that every Morph that will draw something
> at 0@0 will put it in the top left corner of the image displayed. I would
> expect that a morph that is positioned somewhere provides a canvas where 0@0
> is relative to the position of the morph. If coordinates are absoulte how can
> I delegate work to sub components and having them calculate the offsets
> properly?
>
> Welcome to club.
>
> To ease the pain, take a look at TransformMorph.
>
Thanks. I'm trying to understand TransformMorph but I don't really get it. I
cannot see _how_ it is transforming stuff. For testing I have three morphs
MasterMorph
TransformMorph
TestMorph
In TransformMorph I use
MorphicTransform offset: 0 angle: 0 scale: 10.0.
When I implement #drawOn: in TestMorph and do
aCanvas
fillRectangle: (Rectangle origin: 10@10 extent: 10@10)
color: Color red.
the result looks good although I don't understand where the coordinates are
translated. To me it appears that the way it goes is from Canvas to GrafPort
and I didn't find the location where TransformMorph comes into play. I'm trying
to figure that out because I cannot use Float coordinates in my transform
morph. Doing in TestMorph>>#drawOn something like
aCanvas fillRectangle: (Rectangle origin: 0.9@0.9 extent: 1@1)
color: Color green.
I get two problems. Basically the Rectangle is truncated to Ints before the
transform. Additionally in this particular case the rectangle is not displayed
at all. For 0.89@.089 I can see it truncated at origin 0@0 but at 0.9@0.9 it
just disappears. Same goes for 0.63 and other values.
And I don't know how to debug morphic because using breakpoints is too
dangerous while it is in stepping mode.
thanks,
Norbert
