draw 100 red pixels in random locations

draw a red alpha transparent line 3 pixels thick

draw a red alpha transparent box with a 4 pixel border

draw a red alpha transparent filled box

draw a red alpha transparent filled blue bordered box with a border of 4 pixels

draw a red alpha transparent filled blue bordered box. The border will increase in size from 0 to 10 pixels pixels for the border and some white text in the box

draw a red and blue alpha transparent box that overlap. This demonstrates the alpha blending of the images