help on - Objprop_xdistance=0?

#property copyright "Copyright © 2010, Nondisclosure007"
#property link      "[url]http://no.link.yet[/url]"
#property indicator_chart_window
#property indicator_buffers 2
#define nl "\n"
double varUpperAngle[];
double varLowerAngle[];
int init()
  {
   IndicatorBuffers(2);
   IndicatorDigits(Digits);   
   SetIndexBuffer(0,varUpperAngle);
   SetIndexLabel(0,"Upper Angle");
   SetIndexStyle(0,DRAW_NONE);
   SetIndexBuffer(1,varLowerAngle);
   SetIndexLabel(1,"Lower Angle");
   SetIndexStyle(1,DRAW_NONE);
   return(0);
  }
int deinit()
  {
   ObjectDelete("UpperA");ObjectDelete("UpperB");
   ObjectDelete("LowerA");ObjectDelete("LowerB");
   return(0);
  }
int start()
  {
   int i, k, limit, floorError, ceilingError, counted_bars=IndicatorCounted();
   limit = Bars-counted_bars-1; 
   double varLowMALast, varHighMALast, varLowMACurrent, varHighMACurrent;
   string thedate;
   for(i=limit; i>=0; i--)
   {
      varLowMALast=iMA(NULL,0,34,0,MODE_EMA,PRICE_LOW,i+2);
      varHighMALast=iMA(NULL,0,34,0,MODE_EMA,PRICE_HIGH,i+2);
      varLowMACurrent=iMA(NULL,0,34,0,MODE_EMA,PRICE_LOW,i+1);
      varHighMACurrent=iMA(NULL,0,34,0,MODE_EMA,PRICE_HIGH,i+1);
      
      if (ObjectFind("UpperA")==-1)
         {ObjectCreate("UpperA",OBJ_ARROW,0,Time[i+2],varHighMALast);
          ObjectSet("UpperA",OBJPROP_ARROWCODE,SYMBOL_ARROWUP);
         }
      ObjectMove("UpperA",0,Time[i+2],varHighMALast);
      
      if (ObjectFind("UpperB")==-1)
         {ObjectCreate("UpperB",OBJ_ARROW,0,Time[i+1],varHighMACurrent);
          ObjectSet("UpperB",OBJPROP_ARROWCODE,SYMBOL_ARROWUP);
         }
      ObjectMove("UpperB",0,Time[i+1],varHighMACurrent);
      if (ObjectFind("LowerA")==-1)
         {ObjectCreate("LowerA",OBJ_ARROW,0,Time[i+2],varLowMALast);
          ObjectSet("LowerA",OBJPROP_ARROWCODE,SYMBOL_ARROWUP);
         }
      ObjectMove("LowerA",0,Time[i+2],varLowMALast);
      if (ObjectFind("LowerB")==-1)
         {ObjectCreate("LowerB",OBJ_ARROW,0,Time[i+1],varLowMACurrent);
          ObjectSet("LowerB",OBJPROP_ARROWCODE,SYMBOL_ARROWUP);
         }
      ObjectMove("LowerB",0,Time[i+1],varLowMACurrent);
      
      WindowRedraw();
      
      int upperAX=ObjectGet("UpperA",OBJPROP_XDISTANCE); 
      int upperAY=ObjectGet("UpperA",OBJPROP_YDISTANCE); 
      int upperBX=ObjectGet("UpperB",OBJPROP_XDISTANCE); 
      int upperBY=ObjectGet("UpperB",OBJPROP_YDISTANCE); 
      int lowerAX=ObjectGet("LowerA",OBJPROP_XDISTANCE); 
      int lowerAY=ObjectGet("LowerA",OBJPROP_YDISTANCE); 
      int lowerBX=ObjectGet("LowerB",OBJPROP_XDISTANCE); 
      int lowerBY=ObjectGet("LowerB",OBJPROP_YDISTANCE); 
      Comment("UpperAX ",upperAX,nl,
              "UpperAY ",upperAY,nl,
              "UpperBX ",upperBX,nl,
              "UpperBY ",upperBY,nl,
              "LowerAX ",lowerAX,nl,
              "LowerAY ",lowerAY,nl,
              "LowerBX ",lowerBX,nl,
              "LowerBY ",lowerBY);
      
      
   }
   return(0);
  }

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OBJPROP_XDISTANCE: Integer value to set/get anchor X distance object property in pixels.

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OBJPROP_CORNER: Integer value to set/get anchor corner property for label objects. Must be from 0-3.

Quoting sangmane

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hi,

it seems that you draw object with MA value as one of the obj properties, and then trying to get back that MA values by accessing objectget(). what the purposes of this?

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regarding the problems, consult MT4 lang reference:

and this:

so, imo, you should use objectget("object_name",OBJPROP_XDISTANCE) with OBJ_LABEL only, not with other objects like OBJ_ARROW.

hope this help

Quoting nondisclosure00

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I'm drawing the object on a MA trying to get back the xy axis of the price point of that MA.

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Special Arrow codes that exactly points to price and time. It can be one of the following values:

Constant Value Description
1 Upwards arrow with tip rightwards (↱).
2 Downwards arrow with tip rightwards (↳).
3 Left pointing triangle (◄).
4 En Dash symbol (–).
SYMBOL_LEFTPRICE 5 Left sided price label.
SYMBOL_RIGHTPRICE 6 Right sided price label.

Quoting 7bit

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use OBJPROP_TIME1 and OBJPROP_PRICE1 as the coordinates for the arrow. Also there are only a few arrows that are visible exactly at the price, the "normal" arrows are always a bit off:

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Quoting nondisclosure00

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Thanks, but that's not exactly a 1:1 ration when doing trying find the "anlge" of the line.

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double ratio=((WindowPriceMax-WindowPricMin)/Point)/WindowBarsPerChart();

Quoting 7bit

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What are you trying to do? There is no concept of such a thing like an angle in the price chart because x and y are not of the same dimensions. You could measure an angle between two quantities of the same dimension, for example the dimension "length", but not between the two dimensions "price" and "time". Here the notion of an "angle" simply makes no sense at all and this is the reason you are unable to measure it.

You could however define and measure a ratio Δprice / Δtime...

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Quoting nondisclosure00

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I'm trying to find the meaure of an angle based on 2 points on a Moving Average.

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Quoting nondisclosure00

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when you say Δprice / Δtime ratio were talking like:

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double ratio=((WindowPriceMax-WindowPricMin)/Point)/WindowBarsPerChart();

If not, please explain.

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Quoting 7bit

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But there IS NO ANGLE, angles simply do not exist in the price chart! This is where all your problems originate from. I still don't know what you are really trying to do.

Maybe you just want to calculate the slope of the MA-line at a certain time that is defined as the first derivatve of its price. Then you would simply differentiate this discrete time series numerically in steps of Δt = 1 = 1 bar:

slope(t) = (price(t) - price(t-1)) / (t - (t-1))
slope(t) = (price(t) - price(t-1)) / 1
slope(t) = price(t) - price(t-1)

shoud...

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I know I don't have to say this, but Time is an X axis and Y is a price axis. Now, getting the 'scale', aka ratio, wouldn't be that much of a problem, but I'm not sure how accurate it would be. I haven't tested it out yet, but intend to soon.

Example, draw a 'trendline by angle' on your chart. The 'anchor' is based in a price/time coordinate, but it draws the 'angle' based on pixels. Thus when you zoom in and out after drawing the angle, only the anchor stays in place (price/time) where you put it, the rest of the line...

Quoting nondisclosure00

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if you zoom in and out on an angle calculated by the moving average, the angle should still change (because the ratio changes).

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Quoting sangmane

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First, I hope my previous post in this thread has answered why you get OBJPROP_XDISTANCE = 0.

Can you show where in the chart that have Time = 0 and price = 0?
And how do you define Time = 0? Was it the time when we move from BC (Before Christ) to AD (Anno Domini) ?

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Quoting 7bit

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Of course the angle on the screen will change. It will not be the same for any two users. You can do a lot of coding and finally arrive at the ecaxt pixel coordinates of the objects on the screen and then even calculate angles derived from these pixel coordinates but i don't see what is the advantage of messing around with pixel coordinates (that are only valid for a certain zoom factor) when all the other things you can do in MT4 (calculating prices and plotting objects) are all based on absolute time/price coordinates.

Why can't...

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Quoting nondisclosure00

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Pixel coordinates are absolute. They don't care what the 'scales' are in price and time.

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Quoting 7bit

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Pixel coordinates are not absolute, they change and depend on how the chart is scaled. Price and time are absolute.

There are no angles in the chart, I have stated this now often enough, there is no room for any dispute here, it is simply an unescapable fact. What you want to calculate is the slope, you just haven't understood this yet.

I am sure you will understand this some day, you just have to think about it a little longer and a little harder.

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#property indicator_chart_window
#property indicator_buffers 1
#define nl "n"
double varAngle[];
int init()
  {
   IndicatorBuffers(1);
   IndicatorDigits(Digits);   
   SetIndexBuffer(0,varAngle);
   SetIndexLabel(0,"Angle");
   SetIndexStyle(0,DRAW_NONE);
   return(0);
  }
int deinit()
  {
   ObjectDelete("AngleA");
   return(0);
  }
int start()
  {
   int i, k, limit, floorError, ceilingError, counted_bars=IndicatorCounted();
   limit = Bars-counted_bars-1; 
   double varMALast, varMACurrent;
   string thedate;
   for(i=limit; i>=0; i--)
   {
      varMALast=iMA(NULL,0,34,0,MODE_EMA,PRICE_LOW,i+2);
 
      if (ObjectFind("AngleA")==-1)
         {ObjectCreate("AngleA",OBJ_TRENDBYANGLE,0,Time[i+2],varMALast);
          ObjectSet("AngleA",OBJPROP_ANGLE,30);
         }
      ObjectMove("AngleA",0,Time[i+2],varMALast);
      WindowRedraw();
 
      double value=ObjectGetValueByShift("AngleA",i+1);
      Comment("Value :",value);
   }
   return(0);
  }

Quoting sangmane

Disliked

Pixels coordinate of price and time are relative to the scale of Time/pixel and Price/pixel.

Btw, imo, your best tool to get angle in pixel space is by using trendline object

Here is the pic of angle measured from two points of an ema 10, where those points are 5 bars apart

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#property indicator_chart_window
int init()
  {
   return(0);
  }
int deinit()
  {
   return(0);
  }
int start()
  {
      double drop_price=WindowPriceOnDropped();
      datetime drop_time=WindowTimeOnDropped();
      int x=WindowXOnDropped();
      int y=WindowYOnDropped();
      Alert("price:",drop_price," time:",drop_time," X:",x," Y:",y);  
 
   return(0);
  }