86 lines
4.7 KiB
Markdown
86 lines
4.7 KiB
Markdown
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# The Chart Corner to Which an Object Is Attached
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There is a number of [graphical objects](/en/docs/constants/objectconstants/enum_object) for which you can set a chart corner, relative to which the coordinates are specified in pixels. These are the following types of objects (in brackets object type identifiers are specified):
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- Label (OBJ_LABEL);
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- Button (OBJ_BUTTON);
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- Bitmap Label (OBJ_BITMAP_LABEL);
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- Edit (OBJ_EDIT).
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- Rectangle Label (OBJ_RECTANGLE_LABEL);
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| Object | ID | X/Y | Width/Height | Date/Price | OBJPROP_CORNER | OBJPROP_ANCHOR | OBJPROP_ANGLE |
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| --- | --- | --- | --- | --- | --- | --- | --- |
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| Text | OBJ_TEXT | — | — | Yes | — | Yes | Yes |
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| Label | OBJ_LABEL | Yes | Yes (read only) | — | Yes | Yes | Yes |
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| Button | OBJ_BUTTON | Yes | Yes | — | Yes | — | — |
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| Bitmap | OBJ_BITMAP | — | Yes (read only) | Yes | — | Yes | — |
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| Bitmap Label | OBJ_BITMAP_LABEL | Yes | Yes (read only) | — | Yes | Yes | — |
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| Edit | OBJ_EDIT | Yes | Yes | — | Yes | — | — |
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| Rectangle Label | OBJ_RECTANGLE_LABEL | Yes | Yes | — | Yes | — | — |
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The following designations are used in the table:
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- X/Y – coordinates of anchor points specified in pixels relative to a chart corner;
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- Width/Height – objects have width and height. For "read only", the width and height values are calculated only once the object is rendered on chart;
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- Date/Price – anchor point coordinates are specified using the date and price values;
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- OBJPROP_CORNER – defines the chart corner relative to which the anchor point coordinates are specified. Can be one of the 4 values of the [ENUM_BASE_CORNER](/en/docs/constants/objectconstants/enum_basecorner#enum_base_corner) enumeration;
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- OBJPROP_ANCHOR – defines the anchor point in object itself and can be one of the 9 values of the [ENUM_ANCHOR_POINT](/en/docs/constants/objectconstants/enum_anchorpoint#enum_anchor_point) enumeration. Coordinates in pixels are specified from this very point to selected chart corner;
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- OBJPROP_ANGLE – defines the object rotation angle counterclockwise.
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In order to specify the chart corner, from which X and Y coordinates will be measured in pixels, use [ObjectSetInteger](/en/docs/objects/objectsetinteger)(chartID, name, [OBJPROP_CORNER](/en/docs/constants/objectconstants/enum_object_property), chart_corner), where:
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- chartID - chart identifier;
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- name – name of a graphical object;
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- OBJPROP_CORNER – property ID to specify the corner for binding;
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- chart_corner – the desired chart corner, can be one of the values of the ENUM_BASE_CORNER enumeration.
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ENUM_BASE_CORNER
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| ID | Description |
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| --- | --- |
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| CORNER_LEFT_UPPER | Center of coordinates is in the upper left corner of the chart |
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| CORNER_LEFT_LOWER | Center of coordinates is in the lower left corner of the chart |
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| CORNER_RIGHT_LOWER | Center of coordinates is in the lower right corner of the chart |
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| CORNER_RIGHT_UPPER | Center of coordinates is in the upper right corner of the chart |
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Example:
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```
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void CreateLabel(long chart_id,
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string name,
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int chart_corner,
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int anchor_point,
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string text_label,
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int x_ord,
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int y_ord)
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{
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//---
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if(ObjectCreate(chart_id,name,OBJ_LABEL,0,0,0))
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{
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ObjectSetInteger(chart_id,name,OBJPROP_CORNER,chart_corner);
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ObjectSetInteger(chart_id,name,OBJPROP_ANCHOR,anchor_point);
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ObjectSetInteger(chart_id,name,OBJPROP_XDISTANCE,x_ord);
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ObjectSetInteger(chart_id,name,OBJPROP_YDISTANCE,y_ord);
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ObjectSetString(chart_id,name,OBJPROP_TEXT,text_label);
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}
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else
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Print("Failed to create the object OBJ_LABEL ",name,", Error code = ", GetLastError());
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}
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//+------------------------------------------------------------------+
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//| Script program start function |
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//+------------------------------------------------------------------+
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void OnStart()
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{
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//---
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int height=(int)ChartGetInteger(0,CHART_HEIGHT_IN_PIXELS,0);
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int width=(int)ChartGetInteger(0,CHART_WIDTH_IN_PIXELS,0);
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string arrows[4]={"LEFT_UPPER","RIGHT_UPPER","RIGHT_LOWER","LEFT_LOWER"};
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CreateLabel(0,arrows[0],CORNER_LEFT_UPPER,ANCHOR_LEFT_UPPER,arrows[0],50,50);
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CreateLabel(0,arrows[1],CORNER_RIGHT_UPPER,ANCHOR_RIGHT_UPPER,arrows[1],50,50);
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CreateLabel(0,arrows[2],CORNER_RIGHT_LOWER,ANCHOR_RIGHT_LOWER,arrows[2],50,50);
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CreateLabel(0,arrows[3],CORNER_LEFT_LOWER,ANCHOR_LEFT_LOWER,arrows[3],50,50);
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}
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```
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