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Drawing isosceles triangle in MT4

  • #1
  • First Post: Jun 2, 2011 2:01am Jun 2, 2011 2:01am
Hello,

does any one have a script or indicator to draw isosceles triangle ?I marked 2 points, a base point and the vertex and it will draw the other base point.

thanks.

-guandi
  • #2
  • Jun 2, 2011 3:24am Jun 2, 2011 3:24am
Quoting guandi
Hello,

does any one have a script or indicator to draw isosceles triangle ?I marked 2 points, a base point and the vertex and it will draw the other base point.

thanks.

-guandi
I believe it takes either 3 points to define a triangle, or 2 points and an angle, allowing the third point's co-ordinates to be calculated using trigonometry. But angles will change continuously as you change the chart scale, hence three time and price co-ordinates would be simplest. MT4 already has a facility to draw triangles, using these 3 co-ordinate pairs (Insert -> Shapes -> Triangles).

Even if you're saying (your post is unclear) that one of the sides runs parallel with the horizontal axis, and the other equal length side with the vertical axis, you still have the problem of defining 'equal' length, because one axis is measured in time units, and the other in price units, and (once again) the 'visual' ratios are skewed as the chart is re-scaled. Hence 'isosceles' is essentially meaningless.

Even if these problems were solved, you would either need to define the time and price co-ordinates by laboriously typing values, or (for example) two pairs of them could be defined instantly and graphically by placing a trendline on the chart. But it is just as easy to place a triangle on a chart as it is a trendline. And (coming back to my original point) an infinite number of triangles can be drawn through just 2 points.
  • #3
  • Jun 2, 2011 3:41am Jun 2, 2011 3:41am
hello Hanover,

please take a look at the picture, i need to draw an iso triangle, either (A Or B) and C must be specified. If I specified A and C, then B will be caculated and the triangle is drawn and if I specified B and C then A will be caculated. A and B (they should be in a straight line) are the bases and C is the vertex. is this possible?

Hope i am clear. many thanks for replying.

-guandi
Attached Image (click to enlarge)
Click to Enlarge Name: iso triangle.gif Size: 16 KB
  • #4
  • Jun 2, 2011 4:04am Jun 2, 2011 4:04am
Quoting guandi
hello Hanover,

please take a look at the picture, i need to draw an iso triangle, either (A Or B) and C must be specified. If I specified A and C, then B will be caculated and the triangle is drawn and if I specified B and C then A will be caculated. A and B (they should be in a straight line) are the bases and C is the vertex. is this possible?

Hope i am clear. many thanks for replying.

-guandi
Guandi,

Yes that's clear now, you've defined an unambiguous triangle. Price-wise, C is the midpoint of A and B, hence: price(B) = price(A) + 2 x [price(C) – price(A)]

which simplifies to: price(B) = 2 x price(C) – price(A)

Given that we know that time(B) = time(A), we can now calculate both time and price co-ordinates for B.

How do you want do define the price and time co-ordinates for A and C? Do you want to do it graphically by drawing a trendline, or do you want to type them in 'manually' (e.g. 2011.06.02 15:45, 1.6090, 2011.06.02 19:15, 1.6175)?

David
  • #5
  • Jun 2, 2011 4:09am Jun 2, 2011 4:09am
Hello Hanover,

is it possible to be point and click like the insert shape option in MT4? instead of clicking 3 pts, i only click 2? the 1st point will be for A or B and the 2nd pt will be C?

Best regards.

-guandi

Quoting hanover
Guandi,

Yes that's clear now, you've defined an unambiguous triangle. Price-wise, C is the midpoint of A and B, hence: price(B) = price(A) + 2 x [price(C) – price(A)]

which simplifies to: price(B) = 2 x price(C) – price(A)

Given that we know that time(B) = time(A), we can now calculate both time and price co-ordinates for B.

How do you want do define the price and time co-ordinates for A and C? Do you want to do it graphically by drawing a trendline, or do you want to type them in 'manually' (e.g. 2011.06.02 15:45, 1.6090, 2011.06.02 19:15,...
  • #6
  • Jun 2, 2011 4:49am Jun 2, 2011 4:49am
Quoting guandi
Hello Hanover,

is it possible to be point and click like the insert shape option in MT4? instead of clicking 3 pts, i only click 2? the 1st point will be for A or B and the 2nd pt will be C?

Best regards.

-guandi
Guandi,

Here is the best I can do. Be sure to download the script into your ....../(MT4)/experts/scripts folder.

Simply attach as many trendlines to your chart as you wish, all of which must be the same color (e.g. DarkSlateGray), but a different color from any existing trendlines on your chart that will not be used for triangle-plotting purposes.

Note that DarkSlateGray is the third color from the left on the top row of MT4's palette.

You can draw the trendlines like / or \ --- it doesn't matter which.

You can copy a trendline by selecting it, and then holding down the SHIFT key while you drag its middle handle. However, you might find it quicker to simply add another trendline from MT4's toolbar - whatever works best for you.

Now you attach the script below to your chart.
--- Set TrendlineColor to match the color of all of the trendlines that you've just added.
--- Set TriangleColor to the color that you want the script to use for the triangles.

Then when you click OK, all of the trendlines disappear, and each one is replaced by a triangle of your designated color.

To delete the triangles and start over, the quickest way (depending on how many other objects you have on your chart) might be to press Ctrl-B, and then click on the Object column heading to group all objects of the same type together. Then use the Shift and/or Ctrl keys while clicking the mouse to highlight all of the triangle objects, then click the DELETE button.

I'm off to bed now (it's almost 10pm here in NZ, and I must make an early start tomorrow). Try the attached script as a starting point, and I'll read your response tomorrow.

David
Attached File(s)
File Type: mq4 Plot Triangle.mq4   1 KB | 2,423 downloads
  • #7
  • Jun 2, 2011 8:35pm Jun 2, 2011 8:35pm
Hello Hanover,

yes it is working nicely, i am testing it out. By the way, is it possible to have the price to be shown for each of the 3 points? Can you drop me an email or private message, if it is ok with you?

Much appreciated and many thanks.

-guandi

Quoting hanover
Guandi,

Here is the best I can do. Be sure to download the script into your ....../(MT4)/experts/scripts folder.

Simply attach as many trendlines to your chart as you wish, all of which must be the same color (e.g. DarkSlateGray), but a different color from any existing trendlines on your chart that will not be used for triangle-plotting purposes.

Note that DarkSlateGray is the third color from the left on the top row of MT4's palette.

You can draw the trendlines like / or --- it doesn't matter which.

You can copy a trendline...
  • #8
  • Jun 2, 2011 10:47pm Jun 2, 2011 10:47pm
Quoting guandi
By the way, is it possible to have the price to be shown for each of the 3 points?
Guandi,

This version will plot 3 additional (text) objects per triangle, i.e. the price values at each vertex.

David
Attached File(s)
File Type: mq4 Plot Triangle.mq4   3 KB | 1,978 downloads
  • #9
  • Jun 3, 2011 2:41am Jun 3, 2011 2:41am
Hello Hanover,

yes it worked beautifully.

thank you.

-guandi

Quoting hanover
Guandi,

This version will plot 3 additional (text) objects per triangle, i.e. the price values at each vertex.

David
  • #10
  • Jan 29, 2012 7:09am Jan 29, 2012 7:09am
Quoting hanover
Guandi,

This version will plot 3 additional (text) objects per triangle, i.e. the price values at each vertex.

David
Hi David

I am looking for something like this but instead of the text object for the price, would it be possible to add a trendline extended into the future? (ray???) so it would look like this

It would save a lot of time
Attached Image (click to enlarge)
Click to Enlarge Name: rectangle.png Size: 61 KB
Old Habits Die Hard.
  • #11
  • Mar 17, 2012 10:10am Mar 17, 2012 10:10am
Hello Hanover,

Please teach me how to run the script. Many thanks.

Cheers!
  • #12
  • Mar 18, 2012 4:23am Mar 18, 2012 4:23am
Quoting longviews
Hello Hanover,

Please teach me how to run the script. Many thanks.

Cheers!
I found the attached PDF at sunbirdfx — took me about 30 seconds using Google.

Instructions specific to this script — see post #6 above.
Latest version of script — see post #8.
Attached File(s)
File Type: pdf docs_en_pdf_How%20to%20Install%20Indicators.pdf   693 KB | 2,054 downloads
  • #13
  • Mar 18, 2012 4:52am Mar 18, 2012 4:52am
Quoting Shaggy_rock
Hi David

I am looking for something like this but instead of the text object for the price, would it be possible to add a trendline extended into the future? (ray???) so it would look like this

It would save a lot of time
Shaggy,

Sorry, I didn't see your post until just now; I don't subscribe to threads.

If you're still need this script, hopefully the attached will do the job. It plots horizontal rays off each of the three vertices of each triangle on the chart that's the same color as your TriangleColor entry.

If you set DeleteExistingRays = true, all previous rays plotted by the script will be deleted first (and then re-plotted, depending on the triangles that exist currently).

David
Attached File(s)
File Type: mq4 Plot Ray from Triangle.mq4   3 KB | 1,865 downloads
  • #14
  • Mar 19, 2012 11:11pm Mar 19, 2012 11:11pm
Quoting hanover
I found the attached PDF at sunbirdfx — took me about 30 seconds using Google.

Instructions specific to this script — see post #6 above.
Latest version of script — see post #8.
Thanks Hanover.
Re-read the instruction and it works now.
  • #15
  • Mar 8, 2013 10:04pm Mar 8, 2013 10:04pm
Quoting hanover
Shaggy,

Sorry, I didn't see your post until just now; I don't subscribe to threads.

If you're still need this script, hopefully the attached will do the job. It plots horizontal rays off each of the three vertices of each triangle on the chart that's the same color as your TriangleColor entry.

If you set DeleteExistingRays = true, all previous rays plotted by the script will be deleted first (and then re-plotted, depending on the triangles that exist currently).

David
Dear Hanover,

I would have a request to ask you. You seem to master pretty well coding indicators that allows to draw shapes, trendlines and angles, and I don't know who else I could ask for this. So I will explain below what I'm looking for and I would be very gratefull if you could help me coding this indicator.

In two words, I am basically looking for an indicator that can convert a trendline into a kind of Gann Fan but with a squared angle (90°) and five inside angles at 15°, 30°, 45°, 60° and 75°. It would look like the trendlines in the picture attached. I don't care about the scaling of the chart, angles must be measured from what you see on the screen, I have drawn them with a protractor, so it would be "wysiwyg" size of angles. Only the first trendline (the top one) must have to be manually drawn, the others will have to be created by the indicator or the script.

So basically, as I have followed your work on the isocele triangle, I suppose there are several ways to do that :
- Either a script that can convert one trendline into seven trendlines with the six others making a 15°, 30°, 45°, 60°, 75° and a 90° angle from the first one. Having the possibility to choose the size (numbers between 1 and 90 or 1 and 360) of the angles in the settings would be a plus one.
- A second possibility I have thought of is modifing the Gann Fann script attached so it will draw the angles as mentioned above.
- A third one would be an indicator creating what I mean by selecting two points in price and time in the settings (which would basically be a high and a low) and then drawing a trendline between this two points and the other trendlines with the right angles from this trendline.

I don't know what is easier and best.

Thanks a lot if you can help me, again, I would be very gratefull.

Best regards.
Attached Image (click to enlarge)
Click to Enlarge Name: gannfannselectedangles.gif Size: 18 KB
Attached File(s)
File Type: mq4 GannFan.mq4   5 KB | 1,091 downloads
  • #16
  • Mar 8, 2013 10:37pm Mar 8, 2013 10:37pm
Quoting airquest
Dear Hanover,

I would have a request to ask you. You seem to master pretty well coding indicators that allows to draw shapes, trendlines and angles, and I don't know who else I could ask for this. So I will explain below what I'm looking for and I would be very gratefull if you could help me coding this indicator.

In two words, I am basically looking for an indicator that can convert a trendline into a kind of Gann Fan but with a squared angle (90°) and five inside angles at 15°, 30°, 45°, 60° and 75°. It would look like the trendlines in the...
you could ask just about anyone with a high school education.

so, as soon as a new bar forms that messes with the scaling the indicator does or does not re-calc the angles on existing lines?... you either start with a right-angle plus inner angles that then all becomes distorted when the price scaling changes and so you no-longer have a 90 degree angle, or your angle always remain 90 degrees but the lines continually shoot-off into different directions each time the scaling changes?

sounds to me like you haven't thought this entirely through, so i doubt anyone will help you until you properly work-out what it is you are asking. stuffing around trying to work-out the window resolution and then adjust for price scaling etc... what a pita.
Congratulations ScalaFX for coming out of the closet!
  • #17
  • Edited 11:50pm Mar 8, 2013 11:38pm | Edited 11:50pm
Quoting airquest
I don't care about the scaling of the chart, angles must be measured from what you see on the screen, I have drawn them with a protractor, so it would be "wysiwyg" size of angles. Only the first trendline (the top one) must have to be manually drawn, the others will have to be created by the indicator or the script.
As nubcake points out, this can't be done. Apart from text labels, all MT4 objects are anchored by (and therefore move with) time and price co-ordinates, not screen pixel co-ordinates.

Angles are effectively meaningless, because one axis is measured in time units, and the other in price units, and 'visual' ratios are skewed as the chart is re-scaled. For example, you'd need to say something like a 45° angle represents a ratio of X candles (time) : Y pips (price), where you define specific values for X and Y.

Quoting airquest
So basically, as I have followed your work on the isocele triangle, I suppose there are several ways to do that :
- Either a script that can convert one trendline into seven trendlines with the six others making a 15°, 30°, 45°, 60°, 75° and a 90° angle from the first one. Having the possibility to choose the size (numbers between 1 and 90 or 1 and 360) of the angles in the settings would be a plus one.
Can't be done, due to the object time/price anchoring.

Quoting airquest
- A second possibility I have thought of is modifing the Gann Fann script attached so it will draw the angles as mentioned above.
I'm sorry, but I don't have time to study the code, to find out how it works. I tend to prefer to develop from scratch.

Quoting airquest
- A third one would be an indicator creating what I mean by selecting two points in price and time in the settings (which would basically be a high and a low) and then drawing a trendline between this two points and the other trendlines with the right angles from this trendline.
Not 100% sure what you're asking here; but I suspect it would be much quicker to attach a trendline (using MT4's toolbar) than having to ascertain the time and price of each endpoint of the trendline, and then type these (times must be entered in the format YYYY.MM.DD HH:MM) laboriously into the script settings.
  • #18
  • Mar 8, 2013 11:46pm Mar 8, 2013 11:46pm
Quoting hanover
As nubcake points out, this can't be done
i didn't quite say that. i did say that it was not well thought-out yet and entirely arbitrary at the moment, and that whatever way it was done would be a pain in the ass to code. actually, it might not be as bad as i originally thought, because................

it's entirely do-able, if the snippet of code i found online does in fact return the chart window size (i haven't tried it). but that's after the op puts the thinking cap on and removes the arbitrary nature of their original description, but i think by then s/he will realize that there isn't any point in any of this in the end.
Congratulations ScalaFX for coming out of the closet!
  • #19
  • Mar 8, 2013 11:55pm Mar 8, 2013 11:55pm
I just discovered that MT4 has a 'trendline by angle' facility. I'll re-think the possibilities.

Quoting nubcake
i didn't quite say that. i did say that it was not well thought-out yet and entirely arbitrary at the moment, and that whatever way it was done would be a pain in the ass to code. actually, it might not be as bad as i originally thought, because................

it's entirely do-able, if the snippet of code i found online does in fact return the chart window size (i haven't tried it). but that's after the op puts the thinking cap on and removes the arbitrary nature of their original description, but i think by then s/he will realize that there...
Sorry, I didn't mean to misquote you.
  • #20
  • Edited 2:03am Mar 9, 2013 1:45am | Edited 2:03am
Quoting airquest
Dear Hanover, ........
Attached is the best that I can do, in the time that I have avaialble. Be sure to download the script into your ....../(MT4)/experts/scripts folder.

Simply attach as many trendlines to your chart as you wish, all of which must be the same color (e.g. DarkSlateGray), but a different color from any existing trendlines on your chart that will not be used for fan-plotting purposes. Note that DarkSlateGray is the third color from the left on the top row of MT4's palette.

If you draw the trendline like / then the resulting artificial fan will consist of 6 upward pointing trendlines (angles: 0°, 15°, 30°, 45°, 60°, 75°, 90°),
If you draw the trendline like \ then the resulting artificial fan will consist of 6 downward pointing trendlines (angles: 360°, 345°, 330°, 315°, 300°, 285°, 270°)

The script uses MT4's 'trendline by angle' objects to construct the artificial fans. I don't know how robust it is, or how accurate the angles are (see the notes in my previous post); I've never used it before. Each fan consists of 7 trendlines at the angles listed above.

You can copy a trendline by selecting it, and then holding down the SHIFT key while you drag its middle handle. However, you might find it quicker to simply add another trendline from MT4's toolbar - whatever works best for you.

Now you attach the script below to your chart.
--- Set TrendlineColor to match the color of all of the trendlines that you've just added.
--- Set FanColor to the color that you want the script to use for the fans.
--- Set Rays to true if you want the lines to extend indefinitely to the right of the chart. If false, they will end at your trendline's rightmost point.

Then when you click OK, all of the trendlines disappear, and each one is replaced by an artificially constructed fan of your designated color.

To delete the fans and start over, the quickest way (depending on how many other objects you have on your chart) might be to press Ctrl-B, and then click on the Object column heading to group all objects of the same type together. Then use the Shift and/or Ctrl keys while clicking the mouse to highlight all of the triangle objects, then click the DELETE button.

This is the best that I can do in the time that I have available. Please note that Forex Factory does not pay me to answer requests on their forum.
Attached Image (click to enlarge)
Click to Enlarge Name: Image 24.png Size: 25 KB
Attached File(s)
File Type: mq4 Make Fan.mq4   2 KB | 1,019 downloads
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