In this special case, it was realized with a green-to-yellow fill in the background, combined with a green hatching (line pattern fill) in the foreground.
But this is not possible when a gradient-hatching should be applied over different objects with different styles/colors. Any idea how this could be realized?
The dark-blue hatching should be in gradient mode, but the background is in different colors like red, light-blue, white, another hatching in yellow etc. So the solution from the first example is not possible here. I want to have the dark-blue hatching with strong colors in the middle of the polygon, fading out towards the margins of the polygon-area.