DrawingDto-for-drawing-websocket-endpoint

src/main/java/com/example/swiftgathering_server/controller/WebSocketController.java

@@ -1,5 +1,6 @@
 package com.example.swiftgathering_server.controller;
 
+import com.example.swiftgathering_server.dto.DrawingDto;
 import com.example.swiftgathering_server.dto.LocationDto;
 import lombok.RequiredArgsConstructor;
 import org.springframework.messaging.handler.annotation.MessageMapping;
@@ -16,4 +17,9 @@ public class WebSocketController {
     public void location(LocationDto locationDto) {
         simpMessageSendingOperations.convertAndSend("/topic/" + locationDto.getChannelId(), locationDto);
     }
+
+    @MessageMapping("/drawing")
+    public void drawing(DrawingDto drawingDto) {
+        simpMessageSendingOperations.convertAndSend("/topic/" + drawingDto.getChannelId(), drawingDto);
+    }
 }

src/main/java/com/example/swiftgathering_server/domain/GatheringSession.java

@@ -20,7 +20,9 @@ public class GatheringSession {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
-    private final UUID sessionId = UUID.randomUUID();
+    @Column(nullable = false, unique = true)
+    private UUID sessionId;
+
     private LocalDateTime createdTime;
 
     @ElementCollection
@@ -31,6 +33,7 @@ public class GatheringSession {
 
     @Builder
     public GatheringSession(List<GatheringSessionMember> gatheringSessionMembers, LocalDateTime createdTime) {
+        this.sessionId = UUID.randomUUID();
         this.gatheringSessionMembers = gatheringSessionMembers;
         this.createdTime = createdTime;
     }

src/main/java/com/example/swiftgathering_server/dto/DrawingDto.java

@@ -0,0 +1,58 @@
+package com.example.swiftgathering_server.dto;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+@Getter
+@NoArgsConstructor
+public class DrawingDto {
+    private Long senderId;
+    private String channelId;
+    public StrokeState state;
+    public StrokePath path;
+
+    public DrawingDto(StrokeState state, StrokePath path) {
+        this.state = state;
+        this.path = path;
+    }
+
+    @Getter
+    @NoArgsConstructor
+    public static class StrokeState {
+        public String color;
+        public float width;
+        public float alpha;
+        public String blendMode;
+
+        public StrokeState(String color, float width, float alpha, String blendMode) {
+            this.color = color;
+            this.width = width;
+            this.alpha = alpha;
+            this.blendMode = blendMode;
+        }
+    }
+
+    @Getter
+    @NoArgsConstructor
+    public static class StrokePath {
+        public List<Coordinate> coordinates;
+
+        public StrokePath(List<Coordinate> coordinates) {
+            this.coordinates = coordinates;
+        }
+    }
+
+    @Getter
+    @NoArgsConstructor
+    public static class Coordinate {
+        public double latitude;
+        public double longitude;
+
+        public Coordinate(double latitude, double longitude) {
+            this.latitude = latitude;
+            this.longitude = longitude;
+        }
+    }
+}