Transparency with polygon command?

I used the polygon command in R which created an area in the plot. However, the values in this area are not shown wh...

How to fill colors correctly in geom_polygon in ggplot??

I am trying to draw a scatterplot, then overlay some polygons and fill in the polygons with specific colors in ggplo...

how to draw polygons in OpenGL that have an outline drawn with a black pen and another fill color?

How can I draw a shape like this in OpenGL? I mean, I know how to draw polygons in OpenGL. I want to know how to...

about drawing a Polygon in java?

hi there i'm trying to improve myself about java2D and first of all i'm dealing with drawing polygons. However, i ca...

How to draw a polygon, then resize it by scale and move it to center of display area??

I was doing my homework on Graphics2d and Polygon, however I am not able to search (or maybe using wrong keyword?) t...

Export a polygon from an R plot as a shapefile?

I have been trying to export the content of a plot (lines/polygons) as a layer/shapefile that I can open in ArcMap. ...

How can I mask a polygon in an image in MATLAB??

I have drawn a polygon on an image and now want to mask it. I just want to see the region inside the polygon and hav...