supporting longer participant names

Author: MrIceman

examples/main.go

@@ -3,10 +3,34 @@ package main
 import "github.com/mriceman/go-uml/sequence"
 
 func main() {
-	userStartsChatting()
-	userBIsNotPartOfChat()
-	UserBIsPartOfChat()
+	userJoinsChat()
+}
+
+func userJoinsChat() {
+	d := sequence.NewDiagram("new_chat")
+	userA := "userA (name could be quite longer)"
+	userB := "userB"
+	b := "backend"
+
+	d.SetTitle("User starts a chat with someone (doesn't matter if new or not)")
+
+	d.AddParticipants(userA, userB, b)
+
+	_ = d.AddDirectionalEdge(userA, b, `POST /inbox {"recipient": userID, "project": projectID, "projectType": challenge|solution}"`)
+	_ = d.AddDirectionalEdge(b, userA, "Response Status Code: 202, Body: Inbox{id, secret, recipient, ...}")
+	_ = d.AddDirectionalEdge(userA, b, "WS connect")
+	_ = d.AddDirectionalEdge(userA, b, `"{"action": "JOIN", "data": {"inboxId": str, "userId": "str", "inboxSecret": str}}"`)
+	_ = d.AddDirectionalEdge(b, b, "STORE_CONNECTION_ID(userA)")
+	_ = d.AddDirectionalEdge(b, b, "sets unread inbox userA = 0")
+	_ = d.AddDirectionalEdge(b, userA, `{"event": "new_message", "messages": [{"id": str, "inboxId": str, "content": str, "userId": str, "createdAt": str}]}`)
+	_ = d.AddDirectionalEdge(userA, b, `"{"action": "SEND_MESSAGE", "data": {"inboxId": str, "userId": "str", "inboxSecret": str, "content": "hi"}}"`)
+	_ = d.AddDirectionalEdge(b, b, "check connectionID userB")
+	_ = d.AddUndirectionalEdge(b, b, "if connected: ")
+	_ = d.AddDirectionalEdge(b, userB, `{"event": "new_message", "messages": [{"id": str, "inboxId": str, "content": str, "userId": str, "createdAt": str}]}`)
+	_ = d.AddUndirectionalEdge(b, b, "else: ")
+	_ = d.AddUndirectionalEdge(b, b, "increment unread inbox userB")
 
+	d.Render()
 }
 
 func UserBIsPartOfChat() {
@@ -71,6 +95,7 @@ func userStartsChatting() {
 	d.AddParticipants(backend)
 	d.AddParticipants(db)
 
+	d.AddDirectionalEdge(client, backend, "GET /inbox/<TO_ID>")
 	d.AddDirectionalEdge(client, backend, "PUT /chat/user/<TO_ID>")
 	d.AddDirectionalEdge(backend, db, "checks or create inbox for user")
 	d.AddDirectionalEdge(backend, db, "set all unread messages to read if existing")

sequence/diagram.go

@@ -74,10 +74,11 @@ func (d *Diagram) renderParticipants() {
 			}
 		}
 		spacePerBlock := float64(d.dc.Width() / len(d.participants))
-		startX := spacePerBlock*float64(len(d.renderedParticipants)+1) - spacePerBlock/2 - participantsPadding
-		// startX := float64(participantsPadding + (len(d.renderedParticipants) * (participantBoxWidth + 1000/(len(d.participants)))))
-		endX := startX + participantBoxWidth
-		startY := 1000 * 0.1 // 10% from the top
+		strWidth, strHeight := d.dc.MeasureString(p.Name)
+		startX := spacePerBlock*float64(len(d.renderedParticipants)+1) - spacePerBlock/2 - participantsPadding - strWidth/2
+
+		endX := startX + participantBoxWidth + strWidth
+		startY := height * 0.1 // 10% from the top
 		endY := startY + participantBoxHeight
 		// draw the border
 		d.dc.SetColor(color.Black)
@@ -100,11 +101,10 @@ func (d *Diagram) renderParticipants() {
 		d.dc.DrawRectangle(
 			startX,
 			startY,
-			participantBoxWidth,
+			participantBoxWidth+strWidth,
 			participantBoxHeight,
 		)
 		d.dc.SetColor(color.Black)
-		strWidth, strHeight := d.dc.MeasureString(p.Name)
 		centerStrWidth := startX + ((endX - startX) / 2) - strWidth/2
 		centerStrHeight := (endY-startY)/2 + startY + (strHeight / 2)
 
@@ -137,11 +137,13 @@ func (d *Diagram) renderEdges() {
 
 	for idx := range d.edges {
 		e := &d.edges[idx]
+		fromStrWidth, _ := d.dc.MeasureString(e.from.Name)
+		toStrWidth, _ := d.dc.MeasureString(e.to.Name)
 		fromCords := d.participantsCoordMap[e.from.Name]
 		toCords := d.participantsCoordMap[e.to.Name]
-		startX := fromCords.X + participantBoxWidth/2 - 2.5 // 2.5 = half of stroke width
+		startX := fromCords.X + participantBoxWidth/2 - 2.5 + fromStrWidth/2 // 2.5 = half of stroke width
 		startY := fromCords.Y + participantBoxHeight + 2.5 + float64((1+renderedEdges)*verticalSpaceBetweenEdges)
-		endX := toCords.X + participantBoxWidth/2 - 2.5
+		endX := toCords.X + participantBoxWidth/2 - 2.5 + toStrWidth/2
 		isReverseEdge := endX < startX
 
 		d.dc.SetDash(6)