A trend line is formed when a straight line can be drawn between two or more price points. Trend lines are used to judge entry and exit investment timing when trading securities. Our Stock chart allows users drawing trend lines – click on a pencil icon on top-right corner and start drawing. User can draw, then delete the trend lines one by one or all at once. After a trend line is drawn, it stays there even if user zooms the chart to a different time period. Using events, fired when drawing, you can save the trend lines and then display them later.