function TriangleFill(x1,y1,d)       -- x1,y1 is the bottom left point
       d2 = d/2               
       dx = 1
       dy =  math.tan(math.pi/3) 
       x2 = x1 + d
       y2 = y1
       x3 = x2 + d             
     while x1 < x2
     do 
          line( x1,y1,x2,y2)
          line( x2,y2,x3,y2)
          x1 = x1 + .5
          y1 = y1 - dy/2 
          y2 = y1
          x3 = x3 - .5  
     end
 end
 ------------ START OF PROGRAM ---------------
 win = openwindow ("TriangleFill",-1,-1,1000,700)
       setactivewindow (win)
       textsize(2)
       backcolor (0,0,0,255)
 color (0,0,255,255)       
 TriangleFill(100,600,200)
drawtext("Press any key to exit ..",0,0)
sync()
key=inkey()
closewindow(win)             -- This ends the program.
closeapplication()




 

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