Question about ObjectCreate, Rectangles

[yuv98]

Hello,

Im trying to understand ObjectCreate function for couple of days now.

I just don't understand the 2 or more last parameters: priceN and timeN.

What are they? 

At the beggining I thought that the are the coordinate of the object but then I saw the:OBJPROP_TIME,OBJPROP_YDISTANCE,OBJPROP_XSIZE,OBJPROP_YSIZE,OBJPROP_XOFFSET and I've got totally confused.

The second question is about making a rectangle on the screen.

How do I do it? how do I set the width and height of it? do I set coordinate of it? How does it work?

Thank you,

yuv.

[Jack Thomas]

yuv98:

Hello,

Im trying to understand ObjectCreate function for couple of days now.

I just don't understand the 2 or more last parameters: priceN and timeN.

What are they? 

At the beggining I thought that the are the coordinate of the object but then I saw the:OBJPROP_TIME,OBJPROP_YDISTANCE,OBJPROP_XSIZE,OBJPROP_YSIZE,OBJPROP_XOFFSET and I've got totally confused.

The second question is about making a rectangle on the screen.

How do I do it? how do I set the width and height of it? do I set coordinate of it? How does it work?

Thank you,

yuv.

1) Show us your code.

2) First price and time is the starting location of the rectangle, Second price and time is the end location of the rectangle.

3) There is example code on this page. https://www.mql5.com/en/docs/constants/objectconstants/enum_object/obj_rectangle

[yuv98]

Jack Thomas:

1) Show us your code.

2) First price and time is the starting location of the rectangle, Second price and time is the end location of the rectangle.

3) There is example code on this page. https://www.mql5.com/en/docs/constants/objectconstants/enum_object/obj_rectangle

I read the example and I understnad that the set of Object_Rectangle and Object_Rectangle_LABEL are totally different. 

I mean Object_Rectangle_LABEL is set by (x,y) point that relative to the corner of the chart and Object_Rectangle is by (price,time) point? this is where I get confused.

[yuv98]

Here is another probelm thaat I don't understand about rectangles:

Im trying to draw a rectangle on my 0 candle in the chart, I was trying to use this code:

 ObjectCreate(0,"rect",OBJ_RECTANGLE,0,rates[0].time+60,rates[0].open,rates[0].time-60,rates[0].close);

and it just doesn't work. the rectangle is moving wired when I change the "60" parameter.

[Marco vd Heijden]

Some object types are placed by entering time and price parameters where other objects are placed by entering X and Y axis parameters.

The objects that are pegged to time and price will move when the chart is scrolled where the X and Y pegged objects remain stationary as an overlay on the chart, when it is scrolled underneath.

It all depends on what you are trying to do with it.

For details on the object type and its anchor points you can look at the specifications on the object type in the documentation.

ENUM_OBJECT

ID		Description
OBJ_VLINE		Vertical Line
OBJ_HLINE		Horizontal Line
OBJ_TREND		Trend Line
OBJ_TRENDBYANGLE		Trend Line By Angle
OBJ_CYCLES		Cycle Lines
OBJ_ARROWED_LINE		Arrowed Line
OBJ_CHANNEL		Equidistant Channel
OBJ_STDDEVCHANNEL		Standard Deviation Channel
OBJ_REGRESSION		Linear Regression Channel
OBJ_PITCHFORK		Andrews’ Pitchfork
OBJ_GANNLINE		Gann Line
OBJ_GANNFAN		Gann Fan
OBJ_GANNGRID		Gann Grid
OBJ_FIBO		Fibonacci Retracement
OBJ_FIBOTIMES		Fibonacci Time Zones
OBJ_FIBOFAN		Fibonacci Fan
OBJ_FIBOARC		Fibonacci Arcs
OBJ_FIBOCHANNEL		Fibonacci Channel
OBJ_EXPANSION		Fibonacci Expansion
OBJ_ELLIOTWAVE5		Elliott Motive Wave
OBJ_ELLIOTWAVE3		Elliott Correction Wave
OBJ_RECTANGLE		Rectangle
OBJ_TRIANGLE		Triangle
OBJ_ELLIPSE		Ellipse
OBJ_ARROW_THUMB_UP		Thumbs Up
OBJ_ARROW_THUMB_DOWN		Thumbs Down
OBJ_ARROW_UP		Arrow Up
OBJ_ARROW_DOWN		Arrow Down
OBJ_ARROW_STOP		Stop Sign
OBJ_ARROW_CHECK		Check Sign
OBJ_ARROW_LEFT_PRICE		Left Price Label
OBJ_ARROW_RIGHT_PRICE		Right Price Label
OBJ_ARROW_BUY		Buy Sign
OBJ_ARROW_SELL		Sell Sign
OBJ_ARROW		Arrow
OBJ_TEXT		Text
OBJ_LABEL		Label
OBJ_BUTTON		Button
OBJ_CHART		Chart
OBJ_BITMAP		Bitmap
OBJ_BITMAP_LABEL		Bitmap Label
OBJ_EDIT		Edit
OBJ_EVENT		The "Event" object corresponding to an event in the economic calendar
OBJ_RECTANGLE_LABEL		The "Rectangle label" object for creating and designing the custom graphical interface.

[nicholish en]

yuv98:

Hello,

Im trying to understand ObjectCreate function for couple of days now.

Hi Yuv,

It's much easier to use the standard library. Here's an example that draws a rectangle around the highest high and lowest low of the last 50 bars.

//+------------------------------------------------------------------+
//|                                                    Rectangle.mq4 |
//|                                                      nicholishen |
//|                                   www.reddit.com/u/nicholishenFX |
//+------------------------------------------------------------------+
#property copyright "nicholishen"
#property link      "www.reddit.com/u/nicholishenFX"
#property version   "1.00"
#property strict
#property indicator_chart_window

#include <ChartObjects\ChartObjectsShapes.mqh>
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+

CChartObjectRectangle rect;
int OnInit()
  {
//--- indicator buffers mapping
   
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
//---
   ArraySetAsSeries(time,true);
   ArraySetAsSeries(high,true);
   ArraySetAsSeries(low,true);
   int h = iHighest(Symbol(),Period(),MODE_HIGH,50,0);
   int l = iLowest(Symbol(),Period(),MODE_LOW,50,0);
   
   if(prev_calculated == 0)
   {
      rect.Create(0,"Rect",0,time[h],high[h],time[l],low[l]);
   }
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+

[yuv98]

Thank you!

But I have more questions about it:

1)How can I draw a rectangle on my 0 candle? I mean a rect that is just "on" the candle.

I was trying to do it with:

 ObjectCreate(0,"rect",OBJ_RECTANGLE,0,rates[0].time+60,rates[0].open,rates[0].time-60,rates[0].close);

but it didn't work...

2) What is the difference between standard library and the default functions?

[nicholish en]

yuv98:

Thank you!

But I have more questions about it:

1)How can I draw a rectangle on my 0 candle? I mean a rect that is just "on" the candle.

I was trying to do it with:

 ObjectCreate(0,"rect",OBJ_RECTANGLE,0,rates[0].time+60,rates[0].open,rates[0].time-60,rates[0].close);

but it didn't work...

2) What is the difference between standard library and the default functions?

The standard library gives you access to classes that neatly packages the API functions so you can write 1 line of code instead of 10. See my example above. If you are unfamiliar with OOP and working with objects then disregard. 

[Muhammad Ridzuan Mohd Radzali]

   ObjectCreate("rec1", OBJ_LABEL, 0, 0, 0);
   ObjectSetText("rec1", "n", 280, "Wingdings", White);
   ObjectSet("rec1", OBJPROP_CORNER, CORNER_RIGHT_UPPER);
   ObjectSet("rec1", OBJPROP_XDISTANCE,-15);
   ObjectSet("rec1", OBJPROP_YDISTANCE, -75);
   ObjectSet("rec1", OBJPROP_BACK, true);

try using this code.

[yuv98]

thank you