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Specification
I need a MetaTrader 5 solution (preferably an **Indicator**, single `.mq5` file) that enables **crosshair synchronization + chart scrolling synchronization** across multiple open chart windows. The indicator should be attached to each chart that needs to participate.
---
## 1) Goal / What it should do
### A. Multi-chart crosshair (cross lines) sync
* I will open multiple MT5 chart windows (e.g., 4 charts).
* When I move the mouse on **any** chart, all other charts that have this indicator attached (and are in the same group) must display a synchronized “crosshair/cross lines” at the corresponding position:
* **Vertical line** aligned by **time** (same timestamp across charts)
* **Horizontal line** aligned by **price** from the source chart (optional; can be disabled if symbols differ and price is meaningless)
* You must **NOT** force the user to switch to MT5’s system crosshair mode.
You must **simulate the crosshair** using chart objects (e.g., `OBJ_VLINE` + `OBJ_HLINE`).
### B. Multi-chart scroll/zoom/visible range sync
* When I drag/scroll/zoom the source chart (mouse drag, chart shift, mouse wheel zoom, etc.) causing the visible range to change, all other charts in the same group should follow:
* At minimum, ensure the bar containing the **source crosshair time** becomes **visible** on target charts
* Preferably keep the crosshair time at a similar **horizontal position** on each chart (configurable anchor)
* Must support **different symbols and timeframes** (e.g., EURUSD M5 vs XAUUSD H1).
Synchronization should be based on **time**.
---
## 2) Mandatory implementation requirements (must follow)
### A. Use Chart Events
* In `OnInit`, enable required events such as:
* `ChartSetInteger(0, CHART_EVENT_MOUSE_MOVE, true)` and any other needed settings
* In `OnChartEvent`, handle at least:
* `CHARTEVENT_MOUSE_MOVE`
* `CHARTEVENT_CHART_CHANGE`
* Optionally `CHARTEVENT_KEYDOWN` / `CHARTEVENT_CLICK` if needed
### B. Cross-chart communication
* Use **Terminal Global Variables** (`GlobalVariableSet / GlobalVariableGet`) as the broadcast channel.
* Each instance must have a unique identifier (use `ChartID()`).
* All instances in the same group must subscribe to the same broadcast key(s).
* Must implement **anti-echo / anti-loop**:
* When a chart receives a sync message and updates itself, it must **NOT** rebroadcast the same event
* Use `source_chart_id` and/or `timestamp` (sequence) to dedupe
### C. Draw crosshair using objects (performance matters)
* Use objects to simulate crosshair:
* Vertical: `OBJ_VLINE`
* Horizontal: `OBJ_HLINE`
* Object names must include a safe prefix and the chart id, e.g.:
* `sync_xhair_<chart_id>_v` and `sync_xhair_<chart_id>_h`
* Performance requirement:
* If objects already exist, **move/update them**; do not delete and recreate every time
### D. Time/price conversion and navigation
* Convert mouse coordinates to time/price on source chart:
* `ChartXYToTimePrice`
* On target chart, locate a given time:
* Prefer `ChartTimePriceToXY`, or use `iBarShift` to find nearest bar shift
* If target chart does not currently show that time, auto-scroll/navigate to it:
* Using `ChartNavigate` and/or `CHART_FIRST_VISIBLE_BAR`, `CHART_SHIFT`, etc.
---
## 3) Scroll sync strategies (must provide selectable modes)
Provide an input parameter to choose among:
* **Mode A: Strict visible window sync**
Try to make all charts display the same time range (start/end as close as possible)
* **Mode B: Crosshair-time anchor**
Use crosshair time as an anchor and place it at a fixed horizontal percentage position on the chart
(controlled by `AnchorPosition` 0–100, e.g. 60%)
* **Mode C: Minimal sync**
Only ensure the crosshair time is visible; do not force full window alignment
---
## 4) Required input parameters (must exist)
* `input string SyncGroup` : charts only sync within the same group
* `input bool SyncHorizontalLine` : enable/disable horizontal line sync
* `input bool SyncScroll` : enable/disable scroll/zoom sync
* `input int AnchorPosition (0..100)` : target horizontal anchor position percentage
* `input int UpdateThrottleMs` : throttling (default 20–50ms) to prevent lag
* `input SyncMode` : ModeA / ModeB / ModeC (enum or int)
---
## 5) Robustness / edge cases
* If only 1 chart has the indicator, it should not error.
* If a target chart has no history loaded for the requested time (different symbol / missing data):
* Try to load and navigate; if it fails, draw the vertical line at the nearest available bar time, OR skip and log
* `OnDeinit` must clean up:
* Objects created by **this chart instance only**
* Global variables related to **this instance only** (do not delete other groups/instances)
---
## 6) Deliverables
* One compilable `.mq5` source file (Indicator preferred), e.g. `SyncCrosshairScroll.mq5`
* Clear inline comments explaining:
* event capture, global variable message format, anti-echo logic, scroll sync logic
* Usage instructions:
* Attach the indicator to each chart; set the same `SyncGroup` to sync together
* Test instructions:
* Open 4 charts (different symbols/timeframes), move mouse, drag history, zoom; verify others follow
---
## 7) Limitation disclosure (must be stated in delivery notes)
* MT5 system crosshair cannot be truly synchronized across charts; solution must use **object-based simulated cross lines**, visually similar but not the native system crosshair.
---
Developers with prior experience in multi-chart synchronization / event-based MT5 tools: please contact me with price and delivery time.
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