16 KiB
16 KiB
OBJ_CHANNEL
Equidistant Channel
Note
For an equidistant channel, it is possible to specify the mode of its continuation to the right and/or to the left (OBJPROP_RAY_RIGHT and OBJPROP_RAY_LEFT properties accordingly). The mode of filling the channel with color can also be set.
Example
The following script creates and moves an equidistant channel on the chart. Special functions have been developed to create and change graphical object's properties. You can use these functions "as is" in your own applications.
//--- description
#property description "Script draws \"Equidistant Channel\" graphical object."
#property description "Anchor point coordinates are set in percentage of the size of"
#property description "the chart window."
//--- display window of the input parameters during the script's launch
#property script_show_inputs
//--- input parameters of the script
input string InpName="Channel"; // Channel name
input int InpDate1=25; // 1 st point's date, %
input int InpPrice1=60; // 1 st point's price, %
input int InpDate2=65; // 2 nd point's date, %
input int InpPrice2=80; // 2 nd point's price, %
input int InpDate3=30; // 3 rd point's date, %
input int InpPrice3=40; // 3 rd point's price, %
input color InpColor=clrRed; // Channel color
input ENUM_LINE_STYLE InpStyle=STYLE_DASH; // Style of channel lines
input int InpWidth=2; // Channel line width
input bool InpBack=false; // Background channel
input bool InpFill=false; // Filling the channel with color
input bool InpSelection=true; // Highlight to move
input bool InpRayLeft=false; // Channel's continuation to the left
input bool InpRayRight=false; // Channel's continuation to the right
input bool InpHidden=true; // Hidden in the object list
input long InpZOrder=0; // Priority for mouse click
//+------------------------------------------------------------------+
//| Create an equidistant channel by the given coordinates |
//+------------------------------------------------------------------+
bool ChannelCreate(const long chart_ID=0, // chart's ID
const string name="Channel", // channel name
const int sub_window=0, // subwindow index
datetime time1=0, // first point time
double price1=0, // first point price
datetime time2=0, // second point time
double price2=0, // second point price
datetime time3=0, // third point time
double price3=0, // third point price
const color clr=clrRed, // channel color
const ENUM_LINE_STYLE style=STYLE_SOLID, // style of channel lines
const int width=1, // width of channel lines
const bool fill=false, // filling the channel with color
const bool back=false, // in the background
const bool selection=true, // highlight to move
const bool ray_left=false, // channel's continuation to the left
const bool ray_right=false, // channel's continuation to the right
const bool hidden=true, // hidden in the object list
const long z_order=0) // priority for mouse click
{
//--- set anchor points' coordinates if they are not set
ChangeChannelEmptyPoints(time1,price1,time2,price2,time3,price3);
//--- reset the error value
ResetLastError();
//--- create a channel by the given coordinates
if(!ObjectCreate(chart_ID,name,OBJ_CHANNEL,sub_window,time1,price1,time2,price2,time3,price3))
{
Print(__FUNCTION__,
": failed to create an equidistant channel! Error code = ",GetLastError());
return(false);
}
//--- set channel color
ObjectSetInteger(chart_ID,name,OBJPROP_COLOR,clr);
//--- set style of the channel lines
ObjectSetInteger(chart_ID,name,OBJPROP_STYLE,style);
//--- set width of the channel lines
ObjectSetInteger(chart_ID,name,OBJPROP_WIDTH,width);
//--- enable (true) or disable (false) the mode of filling the channel
ObjectSetInteger(chart_ID,name,OBJPROP_FILL,fill);
//--- display in the foreground (false) or background (true)
ObjectSetInteger(chart_ID,name,OBJPROP_BACK,back);
//--- enable (true) or disable (false) the mode of highlighting the channel for moving
//--- when creating a graphical object using ObjectCreate function, the object cannot be
//--- highlighted and moved by default. Inside this method, selection parameter
//--- is true by default making it possible to highlight and move the object
ObjectSetInteger(chart_ID,name,OBJPROP_SELECTABLE,selection);
ObjectSetInteger(chart_ID,name,OBJPROP_SELECTED,selection);
//--- enable (true) or disable (false) the mode of continuation of the channel's display to the left
ObjectSetInteger(chart_ID,name,OBJPROP_RAY_LEFT,ray_left);
//--- enable (true) or disable (false) the mode of continuation of the channel's display to the right
ObjectSetInteger(chart_ID,name,OBJPROP_RAY_RIGHT,ray_right);
//--- hide (true) or display (false) graphical object name in the object list
ObjectSetInteger(chart_ID,name,OBJPROP_HIDDEN,hidden);
//--- set the priority for receiving the event of a mouse click in the chart
ObjectSetInteger(chart_ID,name,OBJPROP_ZORDER,z_order);
//--- successful execution
return(true);
}
//+------------------------------------------------------------------+
//| Move the channel's anchor point |
//+------------------------------------------------------------------+
bool ChannelPointChange(const long chart_ID=0, // chart's ID
const string name="Channel", // channel name
const int point_index=0, // anchor point index
datetime time=0, // anchor point time coordinate
double price=0) // anchor point price coordinate
{
//--- if point position is not set, move it to the current bar having Bid price
if(!time)
time=TimeCurrent();
if(!price)
price=SymbolInfoDouble(Symbol(),SYMBOL_BID);
//--- reset the error value
ResetLastError();
//--- move the anchor point
if(!ObjectMove(chart_ID,name,point_index,time,price))
{
Print(__FUNCTION__,
": failed to move the anchor point! Error code = ",GetLastError());
return(false);
}
//--- successful execution
return(true);
}
//+------------------------------------------------------------------+
//| Delete the channel |
//+------------------------------------------------------------------+
bool ChannelDelete(const long chart_ID=0, // chart's ID
const string name="Channel") // channel name
{
//--- reset the error value
ResetLastError();
//--- delete the channel
if(!ObjectDelete(chart_ID,name))
{
Print(__FUNCTION__,
": failed to delete the channel! Error code = ",GetLastError());
return(false);
}
//--- successful execution
return(true);
}
//+-------------------------------------------------------------------------+
//| Check the values of the channel's anchor points and set default values |
//| for empty ones |
//+-------------------------------------------------------------------------+
void ChangeChannelEmptyPoints(datetime &time1,double &price1,datetime &time2,
double &price2,datetime &time3,double &price3)
{
//--- if the second (right) point's time is not set, it will be on the current bar
if(!time2)
time2=TimeCurrent();
//--- if the second point's price is not set, it will have Bid value
if(!price2)
price2=SymbolInfoDouble(Symbol(),SYMBOL_BID);
//--- if the first (left) point's time is not set, it is located 9 bars left from the second one
if(!time1)
{
//--- array for receiving the open time of the last 10 bars
datetime temp[10];
CopyTime(Symbol(),Period(),time2,10,temp);
//--- set the first point 9 bars left from the second one
time1=temp[0];
}
//--- if the first point's price is not set, move it 300 points higher than the second one
if(!price1)
price1=price2+300*SymbolInfoDouble(Symbol(),SYMBOL_POINT);
//--- if the third point's time is not set, it coincides with the first point's one
if(!time3)
time3=time1;
//--- if the third point's price is not set, it is equal to the second point's one
if(!price3)
price3=price2;
}
//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart()
{
//--- check correctness of the input parameters
if(InpDate1<0 || InpDate1>100 || InpPrice1<0 || InpPrice1>100 ||
InpDate2<0 || InpDate2>100 || InpPrice2<0 || InpPrice2>100 ||
InpDate3<0 || InpDate3>100 || InpPrice3<0 || InpPrice3>100)
{
Print("Error! Incorrect values of input parameters!");
return;
}
//--- number of visible bars in the chart window
int bars=(int)ChartGetInteger(0,CHART_VISIBLE_BARS);
//--- price array size
int accuracy=1000;
//--- arrays for storing the date and price values to be used
//--- for setting and changing channel anchor points' coordinates
datetime date[];
double price[];
//--- memory allocation
ArrayResize(date,bars);
ArrayResize(price,accuracy);
//--- fill the array of dates
ResetLastError();
if(CopyTime(Symbol(),Period(),0,bars,date)==-1)
{
Print("Failed to copy time values! Error code = ",GetLastError());
return;
}
//--- fill the array of prices
//--- find the highest and lowest values of the chart
double max_price=ChartGetDouble(0,CHART_PRICE_MAX);
double min_price=ChartGetDouble(0,CHART_PRICE_MIN);
//--- define a change step of a price and fill the array
double step=(max_price-min_price)/accuracy;
for(int i=0;i<accuracy;i++)
price[i]=min_price+i*step;
//--- define points for drawing the channel
int d1=InpDate1*(bars-1)/100;
int d2=InpDate2*(bars-1)/100;
int d3=InpDate3*(bars-1)/100;
int p1=InpPrice1*(accuracy-1)/100;
int p2=InpPrice2*(accuracy-1)/100;
int p3=InpPrice3*(accuracy-1)/100;
//--- create the equidistant channel
if(!ChannelCreate(0,InpName,0,date[d1],price[p1],date[d2],price[p2],date[d3],price[p3],InpColor,
InpStyle,InpWidth,InpFill,InpBack,InpSelection,InpRayLeft,InpRayRight,InpHidden,InpZOrder))
{
return;
}
//--- redraw the chart and wait for 1 second
ChartRedraw();
Sleep(1000);
//--- now, move the channel's anchor points
//--- loop counter
int h_steps=bars/6;
//--- move the second anchor point
for(int i=0;i<h_steps;i++)
{
//--- use the following value
if(d2<bars-1)
d2+=1;
//--- move the point
if(!ChannelPointChange(0,InpName,1,date[d2],price[p2]))
return;
//--- check if the script's operation has been forcefully disabled
if(IsStopped())
return;
//--- redraw the chart
ChartRedraw();
// 0.05 seconds of delay
Sleep(50);
}
//--- 1 second of delay
Sleep(1000);
//--- move the first anchor point
for(int i=0;i<h_steps;i++)
{
//--- use the following value
if(d1>1)
d1-=1;
//--- move the point
if(!ChannelPointChange(0,InpName,0,date[d1],price[p1]))
return;
//--- check if the script's operation has been forcefully disabled
if(IsStopped())
return;
//--- redraw the chart
ChartRedraw();
// 0.05 seconds of delay
Sleep(50);
}
//--- 1 second of delay
Sleep(1000);
//--- loop counter
int v_steps=accuracy/10;
//--- move the third anchor point
for(int i=0;i<v_steps;i++)
{
//--- use the following value
if(p3>1)
p3-=1;
//--- move the point
if(!ChannelPointChange(0,InpName,2,date[d3],price[p3]))
return;
//--- check if the script's operation has been forcefully disabled
if(IsStopped())
return;
//--- redraw the chart
ChartRedraw();
}
//--- 1 second of delay
Sleep(1000);
//--- delete the channel from the chart
ChannelDelete(0,InpName);
ChartRedraw();
//--- 1 second of delay
Sleep(1000);
//---
}