Dear Arianna,
This is a very interesting application scenario.
I think the best solution would be to combine one CLIP_RECT and two CLIP_ELLIPSE statements in your GraphRep using the keyword
combine-mode: with the value
or.
Below is a solution that I would suggest for this case.
The solution involves defining a table, so the result can be flexibly combined with other graphical elements like for example additional icons, minimum width or height and so on.
In the central part of the table, we combine three CLIP_ statements, as described above, we draw a rectangle (or gradient rectangle, as it results from your image) over this clipped area and then we draw a borded around it.
1GRAPHREP sizing:asymmetrical
2SHADOW on
3
4#definition of colors
5SET colBrd: (rgbval("$1646B6"))
6SET colFFm: (rgbval("white"))
7SET colFTo: (rgbval("$2655C4"))
8
9#definition of the table
10TABLE x: -1.5cm y: -0.6cm w: 3.0cm h: 1.2cm cols:3 rows:3
11 w1: 0.25cm w2: 100% w3: 0.25cm
12 h1: 0.10cm h2: 100% h3:0.10cm
13STRETCH off
14
15SET tabw: (tabx2 - tabx1)
16 tabh: (taby2 - taby1)
17
18#set "CLIP_" area
19CLIP_RECT x: (tabx1) y: (taby1) w: (tabw) h: (tabh)
20CLIP_ELLIPSE x: (tabx1) y: (taby1 + tabh*0.5) rx: (tabh*0.5) ry: (tabh*0.5) combine-mode: or
21CLIP_ELLIPSE x: (tabx1 + tabw) y: (taby1 + tabh*0.5) rx: (tabh*0.5) ry: (tabh*0.5) combine-mode: or
22
23#draw a gradient rectangle
24GRADIENT_RECT x: (tabx1 - tabh*0.5) y: (taby1)
25 w: (tabw + tabh) h: (tabh)
26 style: downdiag
27 color1: (colFFm) color2: (colFTo)
28
29#finish drawing in the "CLIP_" area
30CLIP_OFF
31
32#draw the border around the shape
33PEN w: 0.04cm color: (colBrd)
34
35LINE x1: (tabx1) y1: (taby1) x2: (tabx1 + tabw) y2: (taby1)
36LINE x1: (tabx1) y1: (taby1 + tabh) x2: (tabx1 + tabw) y2: (taby1 + tabh)
37
38ARC x: (tabx1) y: (taby1 + tabh*0.5) rx: (tabh*0.5) ry: (tabh*0.5)
39 x1: (tabx1) y1: (taby1)
40 x2: (tabx1) y2: (taby1 + tabh)
41
42ARC x: (tabx1 + tabw) y: (taby1 + tabh*0.5) rx: (tabh*0.5) ry: (tabh*0.5)
43 x1: (tabx1 + tabw) y1: (taby1 + tabh)
44 x2: (tabx1 + tabw) y2: (taby1)
45
46#continue with other elements that are to be drawn (icons, text, attribute values, etc.)
47...
The attached file coordinates.png contains a sketch with the defined coordinates.
The attached file samples.png shows how this graphrep behaves in the modelling area.