#property description “The Expert Advisor demonstrates how to create a series of screenshots of the current”
#property description “chart using the ChartScreenShot() function. For convenience, the file name is”
#property description “shown on the chart. The height and width of images is defined through macros.”
//—
#define WIDTH 800 // Image width to call ChartScreenShot()
#define HEIGHT 600 // Image height to call ChartScreenShot()
//— input parameters
input int pictures=5; // The number of images in the series
int mode=-1; // -1 denotes a shift to the right edge of the chart, 1 – to the left
int bars_shift=300;// The number of bars when scrolling the chart using ChartNavigate()
//+——————————————————————+
//| Expert initialization function |
//+——————————————————————+
void OnInit()
{
//— Disable chart autoscroll
ChartSetInteger(0,CHART_AUTOSCROLL,false);
//— Set the shift of the right edge of the chart
ChartSetInteger(0,CHART_SHIFT,true);
//— Show a candlestick chart
ChartSetInteger(0,CHART_MODE,CHART_CANDLES);
//—
Print(“Preparation of the Expert Advisor is completed”);
}
//+——————————————————————+
//| Expert tick function |
//+——————————————————————+
void OnTick()
{
//—
}
//+——————————————————————+
//| ChartEvent function |
//+——————————————————————+
void OnChartEvent(const int id,
const long &lparam,
const double &dparam,
const string &sparam)
{
//— Show the name of the function, call time and event identifier
Print(__FUNCTION__,TimeCurrent(),” id=”,id,” mode=”,mode);
//— Handle the CHARTEVENT_CLICK event (“A mouse click on the chart”)
if(id==CHARTEVENT_CLICK)
{
//— Initial shift from the chart edge
int pos=0;
//— Operation with the left chart edge
if(mode>0)
{
//— Scroll the chart to the left edge
ChartNavigate(0,CHART_BEGIN,pos);
for(int i=0;i<pictures;i++)
{
//— Prepare a text to show on the chart and a file name
string name=“ChartScreenShot”+“CHART_BEGIN”+string(pos)+“.gif”;
//— Show the name on the chart as a comment
Comment(name);
//— Save the chart screenshot in a file in the terminal_directory\MQL4\Files\
if(ChartScreenShot(0,name,WIDTH,HEIGHT,ALIGN_LEFT))
Print(“We’ve saved the screenshot “,name);
//—
pos+=bars_shift;
//— Give the user time to look at the new part of the chart
Sleep(3000);
//— Scroll the chart from the current position bars_shift bars to the right
ChartNavigate(0,CHART_CURRENT_POS,bars_shift);
}
//— Change the mode to the opposite
mode*=-1;
}
else // Operation with the right chart edge
{
//— Scroll the chart to the right edge
ChartNavigate(0,CHART_END,pos);
for(int i=0;i<pictures;i++)
{
//— Prepare a text to show on the chart and a file name
string name=“ChartScreenShot”+“CHART_END”+string(pos)+“.gif”;
//— Show the name on the chart as a comment
Comment(name);
//— Save the chart screenshot in a file in the terminal_directory\MQL4\Files\
if(ChartScreenShot(0,name,WIDTH,HEIGHT,ALIGN_RIGHT))
Print(“We’ve saved the screenshot “,name);
//—
pos+=bars_shift;
//— Give the user time to look at the new part of the chart
Sleep(3000);
//— Scroll the chart from the current position bars_shift bars to the right
ChartNavigate(0,CHART_CURRENT_POS,-bars_shift);
}
//— Change the mode to the opposite
mode*=-1;
}
} // End of CHARTEVENT_CLICK event handling
//— End of the OnChartEvent() handler
} |