Support Board
Date/Time: Thu, 21 Nov 2024 20:38:31 +0000
Andrews Pitchforks problem - variations in plotted pitchfork as
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| [2013-04-01 20:51:59] |
| User99606 - Posts: 9 |
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I'm a regular user of Andrews Pitchforks (as well as Schiff and Modified Schiff Pitchforks) and am having an issue with the forks changing slope significantly when small changes are made to horizontal or vertical scale. Below are a couple of examples of the variations cause by a slight change in the price scale. Chart 1.jpg shows a Andrews Pitchfork with multiple parallels. Note that the final bar is touching the lower pitchfork parallel. The pitchfork line and final bar intersect at about 14461 on the Y axis. Chart 2.jpg shows the same chart with a slight change made to the price scale by clicking on the scale and moving the mouse slightly. On this chart the bottom parallel has shifted by around 40 points in relation to the last bar. The low of the last bar remains at 14461, but the parallel has moved down to about 14421. When there are more bars between the pitchfork's origin points and the bar of interest the variations become even greater making the pitchforks of little use in many instances. In addition, the same kinds of pitchfork slope variations occur when changing the bar spacing and sometimes when simply scrolling right or left on the chart. Please let me know if you'd like me to provide screen captures of these instances. Is there any way this can be fixed or the severity of the variation in slope reduced? Date Time Of Last Edit: 2013-04-01 21:23:53
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 Chart 1.jpg / V - Attached On 2013-04-01 21:21:55 UTC - Size: 295.84 KB - 876 views chart 2.jpg / V - Attached On 2013-04-01 21:22:13 UTC - Size: 295.45 KB - 919 views |
| [2013-04-01 21:10:25] |
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We do not see any attachments.
Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing |
| [2013-04-01 22:26:57] |
| User99606 - Posts: 9 |
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We do not see any attachments. I inadvertently hit "Submit" before finishing the message. Date Time Of Last Edit: 2013-04-01 22:27:12
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| [2013-04-02 14:06:57] |
| Al SC Developer - Posts: 434 |
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This is a difficult problem, and has to do with the geometry of the object and the available pixels on the screen. This drawing is made worse due to the number of points per pixel for the symbol you are using, and the very short number of bars in the A-B-C region. The drawing anchors (pitchfork A-B-C points) are used to create the lines. Notice how when you scale, those three points are always correct. We do have a mechanism that allows you to work around the issue. Instead of using the A-B-C anchors, we have the concept of a secondary anchor. When you adjust the secondary anchor, the B-C-Secondary are fixed and set the lines. The con of this method is that the A point can be off, but it is necessary in order to have the lines plotted in a parallel fashion. In order to use the secondary anchors, be sure the "Adjust Secondary" command is on your chart drawing menu, by going to Global Settings >> Customize Chart Drawing Menu. Once enabled, right click the pitchfork drawing near the point where you want to set the secondary anchor, and use the Adjust Secondary menu option. Place and click the mouse where you want to fix the secondary anchor (i.e. a bar high/low). From this point forward, the B-C-secondary points should be maintained. If later you modify the A anchor, the secondary will be reset. |
| [2013-04-05 21:51:54] |
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Documentation has been updated to explain this: http://www.sierrachart.com/index.php?l=doc/doc_Tools.html#Pitchfork Sierra Chart Support - Engineering Level Your definitive source for support. Other responses are from users. Try to keep your questions brief and to the point. Be aware of support policy: https://www.sierrachart.com/index.php?l=PostingInformation.php#GeneralInformation For the most reliable, advanced, and zero cost futures order routing, *change* to the Teton service: Sierra Chart Teton Futures Order Routing |
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