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Feat: LENGTHEN command (LEN) — extend or trim Line/Arc

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Options via text input after entity pick:
  DE <delta>   — extend by delta (negative trims)
  TO <total>   — set absolute total length / arc length
  P <percent>  — scale by percentage
  <number>     — plain number treated as DE delta

Closest end to pick point is modified. Uses CmdResult::LengthenEntity.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-04-02 23:45:06 +03:00
commit f6efe7a06a
5 changed files with 237 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

24
src/app/cmd_result.rs
View file

@ -371,6 +371,30 @@ impl H7CAD {
self.restore_pre_cmd_tangent();
self.command_line.push_output(&msg);
}
CmdResult::LengthenEntity { handle, pick_pt, mode } => {
use crate::modules::home::modify::lengthen::lengthen_entity;
let result = self.tabs[i].scene.document
.get_entity(handle)
.and_then(|e| lengthen_entity(e, pick_pt, &mode));
match result {
Some(new_entity) => {
let label = self.history_label_from_active_cmd(i, "LENGTHEN");
self.push_undo_snapshot(i, label);
self.tabs[i].scene.erase_entities(&[handle]);
self.tabs[i].scene.add_entity(new_entity);
self.tabs[i].dirty = true;
self.command_line.push_output("LENGTHEN: applied.");
self.refresh_properties();
}
None => {
self.command_line.push_error("LENGTHEN: entity type not supported.");
}
}
self.tabs[i].active_cmd = None;
self.tabs[i].snap_result = None;
self.tabs[i].scene.clear_preview_wire();
self.restore_pre_cmd_tangent();
}
CmdResult::DivideEntity { handle, n } => {
use crate::modules::home::inquiry::divide::divide_entity;
let pts = self.tabs[i].scene.document

9
src/app/commands.rs
View file

@ -985,6 +985,13 @@ impl H7CAD {
self.tabs[i].active_cmd = Some(Box::new(cmd));
}
"LENGTHEN"|"LEN" => {
use crate::modules::home::modify::lengthen::LengthenCommand;
let cmd = LengthenCommand::new();
self.command_line.push_info(&cmd.prompt());
self.tabs[i].active_cmd = Some(Box::new(cmd));
}
"DIVIDE"|"DIV" => {
use crate::modules::home::inquiry::divide::DivideCommand;
let cmd = DivideCommand::new();
@ -1024,7 +1031,7 @@ impl H7CAD {
"HELP"|"?" => {
self.command_line.push_output(
"Draw: LINE CIRCLE ARC PLINE RECT POLY POINT ELLIPSE SPLINE RAY XLINE HATCH | \
Modify: MOVE COPY ROTATE SCALE MIRROR ERASE OFFSET EXTEND FILLET CHAMFER STRETCH EXPLODE TRIM BREAK JOIN | \
Modify: MOVE COPY ROTATE SCALE MIRROR ERASE OFFSET EXTEND FILLET CHAMFER STRETCH EXPLODE TRIM BREAK JOIN LENGTHEN | \
Array: ARRAY ARRAYRECT ARRAYPOLAR ARRAYPATH | \
Text: TEXT MTEXT LEADER MLEADER | \
Dimension: DIMLINEAR DIMANGULAR DIMRADIUS | \