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Drawing isosceles triangle in MT4

  • #21
  • Edited 12:30pm Mar 9, 2013 12:01pm | Edited 12:30pm
Quoting 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.
Hanover, thank you for your work. I know you're not paid for responding to requests, that is why I would never ask for someone to reply if he's not interested in the project or if he doesn't have time or doesn't get intellectual interest or another satisfaction in making it done.

I have tried your fan and this is exactly what I was looking for, except for one thing : it would be a much more usefull tool if we could have a fan that respects the first drawn trendline to measure the angles. That means that the two extreme trendlines (separated by the 90° angle) would not always be two straight horizontal and vertical lines. I would like to be able to get the angles measured not from the horizontal line, but from the top trendline for fans pointing up and from the bottom trendline for fans pointing down.

I am quite sure that this is impossible to do with the "trendline by angle" tool from MT4, because it always takes a straight horizontal line as a base to measure the angles. That is a big handicap in MT4 I think, but I'm sure there is a way to overcome this. I'm still trying to figure this out. I have thought about drawing a rectangle triangle instead of two trendlines with a 90° angle, but I'm not sure if MT4 is able to draw a perfect rectangle triangle that doesn't involve a vertical and an horizontal line.

If you find a way to fix this, it would be really nice and would lead I think to a very usefull tool. What I'm trying to have is a simple tool for applying geometrical rules and shapes to graphical analysis. It can be done with a screen protractor, but it takes a very long time and the procedure has to be reproduced everytime another wave or pattern comes. Again, don't bother if you don't find any interest in responding to this project, either if it is consideration, acknowledgement or intellectual interest. If there is a need for financial motivation, make me an offer and I will consider it .

Thanks again for your great work. Best regards.

To respond to nubcake : I know the chart adjusts himself and lines move, but it is not a problem in my opinion because what I'm looking for is a visual tool, not based on price or time, like Gann theory but with different angles. Gann Fan has the same problem and chart has to be fixed to scale 1:1. So I am using geometrical rules to get visual references and support/resistance lines on a fixed scale chart, so the chart adjusting is not a problem when it is for visual purpose... If you look here http://www.forexfactory.com/showthre...88#post1573888, you will see I'm not the only one using visual references and angles in analysis. I know the charts are scaled based on price and time and that it is hard to have references for angle measurement, I have read many times here and on other threads "angles are meaningless" in MT4. But that is not true in my opinion. The proof is the existence of the "trendline by angle" tool, but it has the inconvenient I pointed out above, which I would like to overcome.
  • #22
  • Mar 9, 2013 4:09pm Mar 9, 2013 4:09pm
Quoting airquest
...
For those interested in discussing this question, there could be rules that can be used to draw geometric shapes and angles without messing too much with the scale. They are available here : http://www.mathsteacher.com.au/year8...gles/const.htm. The problem is that it is based on bissecting angles which involves using circles. It could be possible for MT4 to draw perfect circles, but it would involve scaling them right, so finding the right setting in the scale setting of the ellipses. For example in a 1:1 scale, setting the ellipse scale to 0,1 draws perfect circles and intersections can be used to measure angles. I think this first step can be done manually and visually on other scales than 1:1, which means drawing a circle that looks perfect and remembering the scale to use for the ellipses. So a solution would be to draw mechanically angles calculated by a script or indicator after having set the scale for the ellipses to be used, but I agree that seems to be really fastidious to create...
  • #23
  • Mar 9, 2013 6:09pm Mar 9, 2013 6:09pm
Quoting airquest
To respond to nubcake : I know the chart adjusts himself and lines move, but it is not a problem in my opinion because what I'm looking for is a visual tool, not based on price or time, like Gann theory but with different angles. Gann Fan has the same problem and chart has to be fixed to scale 1:1. So I am using geometrical rules to get visual references and support/resistance lines on a fixed scale chart, so the chart adjusting is not a problem when it is for visual purpose... If you look here http://www.forexfactory.com/showthre...88#post1573888,...
so that doesn't really clarify things...

so you are saying that no-matter how many bars are on screen, how much vertical scale there is, and so on, that you just want an adjustable right-angle with inner angles. so even if the scaling does get screwed-up you still want them to look like a right-angle (i.e. completely changing everything you may have previously been measuring)?

seems rather meaningless and completely arbitrary, as per your note that people say this all of the time (for good reason). you could just draw on some cellophane and hold it up to your screen.

i don't know why you are linking to some math page... some of us are a little bit past that stage, and it doesn't help your cause to assume that we don't know what we are doing (here's a little hint for you : years ago i wrote a very basic 3D engine and renderer, plus other bits and pieces of ideas i was testing). if i had the time and inclination i'd almost code this just to spite you, but i just don't have the time to waste. i think the cellophane idea is your best bet for now.
Congratulations ScalaFX for coming out of the closet!
  • #24
  • Mar 9, 2013 6:45pm Mar 9, 2013 6:45pm
Quoting nubcake
so that doesn't really clarify things...

so you are saying that no-matter how many bars are on screen, how much vertical scale there is, and so on, that you just want an adjustable right-angle with inner angles. so even if the scaling does get screwed-up you still want them to look like a right-angle (i.e. completely changing everything you may have previously been measuring)?

seems rather meaningless and completely arbitrary, as per your note that people say this all of the time (for good reason). you could just draw on some cellophane...

I was just asking, and never meant to give you lessons. don't waste your time on what you find crap, it's ok, I would do the same. I know now it is impossible without taking account of the scale. I was thinking of getting it automatically done on a fixed scale chart and not touching the scale anymore. This is how I do it by hand. Like you say, it is completely arbitrary, but not meaningless to me, as I find helpfull to have amplitude references based on angles of trends and price movement. So nevermind, who don't try never get anything and the Hanover's fan is good enough for me. Thanks for your help also. By the way, the cellophane stuff is a good idea, I would have never thought about that. thanks.
  • #25
  • Mar 10, 2013 1:10am Mar 10, 2013 1:10am
Quoting airquest
I have tried your fan and this is exactly what I was looking for, except for one thing : it would be a much more usefull tool if we could have a fan that respects the first drawn trendline to measure the angles. That means that the two extreme trendlines (separated by the 90° angle) would not always be two straight horizontal and vertical lines. I would like to be able to get the angles measured not from the horizontal line, but from the top trendline for fans pointing up and from the bottom trendline for fans pointing down.
Quoting airquest
They are available here : http://www.mathsteacher.com.au/year8...gles/const.htm.
The problem is not my math knowledge but the limitations imposed by MQL4. It allows trendline (which are defined by two sets of time/price co-ordinates) and trendline-by-angle (which is defined by one set of time/price co-ordinates, and an angle) objects. Given that you want to define the lines by their angle, the trendline-by-angle seems the only way to proceed (as I did in MakeFan.mq4), but it seems to produce erratic results for angles > 90 degrees.

Hence I don't believe that I can progress your request any further.
  • #26
  • Mar 10, 2013 1:48am Mar 10, 2013 1:48am
Quoting hanover
The problem is not my math knowledge but the limitations imposed by MQL4. It allows trendline (which are defined by two sets of time/price co-ordinates) and trendline-by-angle (which is defined by one set of time/price co-ordinates, and an angle) objects. Given that you want to define the lines by their angle, the trendline-by-angle seems the only way to proceed (as I did in MakeFan.mq4), but it seems to produce erratic results for angles > 90 degrees.

Hence I don't believe that I can progress your request any further.
manually generating the lines with an indi shouldn't be an impossible mission, except for the fact that i don't see any way to overcome the mismatching granularity of a window width versus the number of bars that fit within that window... i.e. drag the window edge a little to the left or right would skew the underlying x-scale maths based on the window width but the number of bars showing doesn't shrink/grow fractionally accordingly (at least, to my knowledge?). the granularity of window width versus bars visible doesn't match 1:1.

if that could be overcome then the x and y scale can be solved and then the rest is just a bit of trig.

but, i haven't looked at mql for awhile so i might be taking the wrong line of thought.
Congratulations ScalaFX for coming out of the closet!
  • #27
  • Mar 10, 2013 4:45am Mar 10, 2013 4:45am
Quoting nubcake
manually generating the lines with an indi shouldn't be an impossible mission, except for the fact that i don't see any way to overcome the mismatching granularity of a window width versus the number of bars that fit within that window... i.e. drag the window edge a little to the left or right would skew the underlying x-scale maths based on the window width but the number of bars showing doesn't shrink/grow fractionally accordingly (at least, to my knowledge?). the granularity of window width versus bars visible doesn't match 1:1.

if that could...
Nubs, thanks for the ideas. I'm sure there's a way of coding it using 'trendline' (rather than 'trendline by angle'), using trig like you say, but only provided that a Z° angle is first arbitrarily defined as a ratio of X candles (time) : Y pips (price). Then the other angles could be interpolated/extrapolated from that ratio.

Anyway, it's Sunday evening here and I'm feeling too jaded to put my aging brain cells to that much work. My high school math days are almost 35 years behind me now, and I'd probably have to Google the sine and cosine laws, to jog my memory. LOL.

Off topic, my wife and I enjoyed a Derren Brown video today. Very entertaining. Not sure how patting the dog statue improved the probability of rolling a 4 on the die to anything more than 1 in 6, but of course that wasn't necessarily the point he was making.
  • #28
  • Edited 5:44am Mar 10, 2013 5:31am | Edited 5:44am
Quoting hanover
Nubs, thanks for the ideas. I'm sure there's a way of coding it using 'trendline' (rather than 'trendline by angle'), using trig like you say, but only provided that a Z° angle is first arbitrarily defined as a ratio of X candles (time) : Y pips (price). Then the other angles could be interpolated/extrapolated from that ratio.
yup. really you just need a func to translate from screen co-ords to chart co-ords, and then another in reverse... then from that it's just a case of rotating the vector of the plotted trendline +- 90 degrees, and the inner angles.

Quote
Anyway, it's Sunday evening here and I'm feeling too jaded to put my aging brain cells to that much work. My high school math days are almost 35 years behind me now, and I'd probably have to Google the sine and cosine laws, to jog my memory. LOL.
i just refer back to my 3D project to jog my memory or copy/paste the vector rotation code. not long after i had solved a bunch of different 3D math that i needed (like cutting/culling against a 3D plane etc) and had it sitting in an include file it all fell out the back of my brain.

Quote
Off topic, my wife and I enjoyed a Derren Brown video today. Very entertaining. Not sure how patting the dog statue improved the probability of rolling a 4 on the die to anything more than 1 in 6, but of course that wasn't necessarily the point he was making.
yeah that 4 was something. i haven't figured how he did it. there's a few possibilities people have come up with but he's so crafty that it's almost pointless trying to figure him out. keep working through his stuff... it's all gold. enigma, svengali, the experiments, etc.
Congratulations ScalaFX for coming out of the closet!
  • #29
  • Jan 14, 2021 4:37am Jan 14, 2021 4:37am
Quoting hanover
{quote} 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...
hi mate
seem indi dosen t work ?
  • #30
  • Last Post: Edited 11:46pm Mar 5, 2021 11:14pm | Edited 11:46pm
Quoting hanover
{quote} 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.


@hanover
can you draw triangle indicator that draw every HH LL ?

- Down Triangle (color Red)
point A = HH / LH
point B = LL
point C = 2x (A to B) at same price level point A --- prefer fib timezone customize

- UpTriangle (color Grey)
point A = LL / HL
point B = HH
point C = 2x (A to B) at same price level point A --- prefer fib timezone customize

with MTF support

thanks before


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