How to draw filled polygon?

Question

How to draw filled polygon in Android ?

Answer 1

Old question, but a trick for anyone who finds this. If you include a font with the desired polygon as a glyph you can use the drawText function to draw your polygon.

The downside is you have to know ahead of time what shapes you'll need. The upside it is if you do know ahead of time you can include a nice shape library. This code assumes you have a font called shapes in your assets/fonts folder of your project.

            TypeFace shapesTypeFace = Typeface.createFromAsset(getAssets(), "fonts/shapes.ttf");
            Paint stopSignPaint = new Paint();
            stopSignPaint.setColor(Color.RED);
            //set anti-aliasing so it looks nice
            stopSignPaint.setAntiAlias(true);
            stopSignPaint.setTextSize(200);
            stopSignPaint.setTypeface(shapesTypeFace);

            //will show up as a box or question mark since 
            //the current display font doesn't have this glyph. 
            //open the shapes font in a tool like Character Map 
            //to copy and paste the glyph into your IDE
            //saving it as a variable makes it much easier to work with
            String hexagonGlyph = ""
            String triangleGlyph = ""


            ....whatever code you got...


            //arguments: text, x coordinate, y coordinate, paint
             canvas.drawText(hexagonGlyph, 200, 100, stopSignPaint);

            //make it into a go sign
            stopSignPaint.setColor(Color.Green);
             canvas.drawText(hexagonGlyph, 200, 100, stopSignPaint);


            //make a tiny one
            stopSignPaint.setTextSize(20);
            stopSignPaint.setColor(Color.RED);
             canvas.drawText(hexagonGlyph, 200, 100, stopSignPaint);


             //make a triangle
             canvas.drawText(triangleGlyph, 200, 100, stopSignPaint);