diff --git a/packages/iges/src/api.ts b/packages/iges/src/api.ts
index 21da7a4305..470b28bb69 100644
--- a/packages/iges/src/api.ts
+++ b/packages/iges/src/api.ts
@@ -13,7 +13,7 @@ export enum Unit {
     UIN // microinches
 }
 
-export enum Type {
+export const enum Type {
     INT,
     FLOAT,
     STR,
@@ -22,14 +22,14 @@ export enum Type {
     POINTER
 }
 
-export enum SpecVersion {
+export const enum SpecVersion {
     IGES50 = 8,
     IGES51 = 9,
     IGES52 = 10,
     IGES53 = 11
 }
 
-export enum DraftVersion {
+export const enum DraftVersion {
     NONE = 0,
     ISO,
     AFNOR,
@@ -40,7 +40,9 @@ export enum DraftVersion {
     JIS
 }
 
-export enum LineFontPattern {
+export type SectionType = "G" | "S" | "D" | "P" | "T";
+
+export const enum LineFontPattern {
     NONE = 0,
     SOLID,
     DASHED,
@@ -49,7 +51,7 @@ export enum LineFontPattern {
     DOTTED
 }
 
-export enum Color {
+export const enum Color {
     NONE = 0,
     BLACK,
     RED,
@@ -61,19 +63,19 @@ export enum Color {
     WHITE
 }
 
-export enum StatusBlank {
+export const enum StatusBlank {
     VISIBLE = 0,
     BLANK
 }
 
-export enum StatusSubord {
+export const enum StatusSubord {
     INDEPENDENT = 0,
     PHYSICAL,
     LOGICAL,
     BOTH
 }
 
-export enum StatusUsage {
+export const enum StatusUsage {
     GEOMETRY = 0,
     ANNOTATION,
     DEFINITION,
@@ -83,24 +85,35 @@ export enum StatusUsage {
     CONSTRUCTIVE
 }
 
-export enum StatusHierarchy {
+export const enum StatusHierarchy {
     GLOBAL_TOP_DOWN = 0,
     GLOBAL_DEFER,
     USE_PROP
 }
 
-export enum PolylineMode {
+export const enum PolylineMode {
     OPEN,
     CLOSED,
     FILLED
 }
 
+export const enum EntityType {
+    POLYLINE = 106,
+    LINE = 110,
+    POINT = 116
+}
+
+export interface EntityOpts {
+    color: Color;
+    pattern: LineFontPattern;
+}
+
 // spec page 24 (53)
 export interface DictEntry {
     type: number;
     param: number;
     struct: number;
-    pattern: number;
+    pattern: LineFontPattern;
     level: number;
     view: number;
     matrix: number;
@@ -108,7 +121,7 @@ export interface DictEntry {
     status: Partial<EntityStatus>;
     index: number;
     lineWeight: number;
-    color: number;
+    color: Color;
     lineCount: number;
     form: number;
     label: string;
diff --git a/packages/iges/src/index.ts b/packages/iges/src/index.ts
index efd9874c46..8d8072cc1d 100644
--- a/packages/iges/src/index.ts
+++ b/packages/iges/src/index.ts
@@ -1,5 +1,10 @@
 import { defmulti } from "@thi.ng/defmulti";
-import { float, padLeft, padRight } from "@thi.ng/strings";
+import {
+    float,
+    hstr,
+    padLeft,
+    padRight
+} from "@thi.ng/strings";
 import {
     comp,
     map,
@@ -14,28 +19,33 @@ import {
 import {
     DEFAULT_GLOBALS,
     DictEntry,
+    EntityOpts,
     EntityStatus,
+    EntityType,
     GlobalParams,
     IGESDocument,
     Param,
     PolylineMode,
+    SectionType,
     Type,
     Unit
 } from "./api";
 
+// https://wiki.eclipse.org/IGES_file_Specification
+// http://paulbourke.net/dataformats/iges/IGES.pdf
+
 const LINEWIDTH_GLOBALS = 72;
 const LINEWIDTH_PARAMS = 64;
 
 const $Z2 = padLeft(2, "0");
 const $Z7 = padLeft(7, "0");
 const $F8 = padLeft(8, " ");
-const $STR = (x: any) =>
-    x != null ? ((x = x.toString()), `${x.length}H${x}`) : "";
+
 const $SEQ = padLeft(7, " ");
 const $BODY = padRight(72, " ");
 const $PBODY = padRight(64, " ");
 const $DATE = (d: Date) =>
-    $STR(
+    hstr(
         [
             d.getUTCFullYear(),
             $Z2(d.getUTCMonth() + 1),
@@ -55,9 +65,10 @@ export const newDocument = (
     const $FF = float(globals.precision);
     const $PARAM = defmulti<any[], string>((x) => x[1]);
     $PARAM.add(Type.INT, (x) => x[0].toString());
+    $PARAM.add(Type.POINTER, (x) => x[0].toString());
     $PARAM.add(Type.FLOAT, (x) => $FF(x[0]));
     $PARAM.add(Type.STR, (x) => x[0]);
-    $PARAM.add(Type.HSTR, (x) => $STR(x[0]));
+    $PARAM.add(Type.HSTR, (x) => hstr(x[0]));
     $PARAM.add(Type.DATE, (x) => $DATE(x[0]));
 
     return {
@@ -85,7 +96,7 @@ export const serialize = (doc: IGESDocument) =>
         formatTerminate(doc)
     ].join("\n");
 
-const formatLine = (body: string, type: string, i: number) =>
+const formatLine = (body: string, type: SectionType, i: number) =>
     `${$BODY(body)}${type}${$SEQ(i + 1)}`;
 
 const formatStart = (doc: IGESDocument) => {
@@ -207,49 +218,107 @@ const formatParams = (
     });
 };
 
-// type table: page 38 (67)
-
-// sec 4.7, page 77 (106)
-export const addPolyline2d = (
+const addEntity = (
     doc: IGESDocument,
-    pts: ArrayLike<number>[],
-    form = PolylineMode.OPEN
+    type: EntityType,
+    entry: Partial<DictEntry>,
+    params: Param[],
+    opts: Partial<EntityOpts> = {}
 ) => {
     const did = doc.offsets.D;
     const pid = doc.offsets.P;
-    const params = formatParams(
+    const fparams = formatParams(
         doc,
-        [
-            [106, Type.INT],
-            [1, Type.INT],
-            [pts.length + (form === PolylineMode.CLOSED ? 1 : 0), Type.INT],
-            [0, Type.FLOAT],
-            ...mapcat<number[], Param>(
-                ([x, y]) => [[x, Type.FLOAT], [y, Type.FLOAT]],
-                form === PolylineMode.CLOSED
-                    ? <any>wrap(pts, 1, false, true)
-                    : pts
-            )
-        ],
+        [<Param>[type, Type.INT]].concat(params),
         formatParam(did, pid)
     );
-    doc.offsets.P += params.length;
+    doc.offsets.P += fparams.length;
     doc.offsets.D += 2;
     doc.dict.push(
         ...formatDictEntry(<DictEntry>{
-            type: 106,
-            form: form === PolylineMode.FILLED ? 63 : 11,
+            type,
+            pattern: opts.pattern || 0,
+            color: opts.color || 0,
             param: pid,
             index: did,
-            lineCount: params.length
+            lineCount: fparams.length,
+            ...entry
         })
     );
-    doc.param.push(...params);
+    doc.param.push(...fparams);
     return doc;
 };
 
-export const addPolygon2d = (doc: IGESDocument, pts: ArrayLike<number>[]) =>
-    addPolyline2d(doc, pts, PolylineMode.FILLED);
+export const addPolyline = (
+    doc: IGESDocument,
+    pts: ArrayLike<number>[],
+    form = PolylineMode.OPEN,
+    opts?: Partial<EntityOpts>
+) =>
+    addEntity(
+        doc,
+        EntityType.POLYLINE,
+        {
+            form: form === PolylineMode.FILLED ? 63 : 11
+        },
+        [
+            [pts[0].length == 2 ? 1 : 2, Type.INT],
+            [pts.length + (form === PolylineMode.CLOSED ? 1 : 0), Type.INT],
+            [0, Type.FLOAT],
+            ...mapcat<number[], Param>(
+                (p) => map((x) => <Param>[x, Type.FLOAT], p),
+                form === PolylineMode.CLOSED
+                    ? <any>wrap(pts, 1, false, true)
+                    : pts
+            )
+        ],
+        opts
+    );
+
+export const addPolygon = (
+    doc: IGESDocument,
+    pts: ArrayLike<number>[],
+    opts?: Partial<EntityOpts>
+) => addPolyline(doc, pts, PolylineMode.FILLED, opts);
+
+export const addPoint = (
+    doc: IGESDocument,
+    p: ArrayLike<number>,
+    opts?: Partial<EntityOpts>
+) =>
+    addEntity(
+        doc,
+        EntityType.POINT,
+        null,
+        [
+            [p[0], Type.FLOAT],
+            [p[1], Type.FLOAT],
+            [p[2] || 0, Type.FLOAT],
+            [0, Type.POINTER]
+        ],
+        opts
+    );
+
+export const addLine = (
+    doc: IGESDocument,
+    a: ArrayLike<number>,
+    b: ArrayLike<number>,
+    opts?: Partial<EntityOpts>
+) =>
+    addEntity(
+        doc,
+        EntityType.LINE,
+        null,
+        [
+            [a[0], Type.FLOAT],
+            [a[1], Type.FLOAT],
+            [a[2] || 0, Type.FLOAT],
+            [b[0], Type.FLOAT],
+            [b[1], Type.FLOAT],
+            [b[2] || 0, Type.FLOAT]
+        ],
+        opts
+    );
 
 // sec 4.23, page 123 (type 126)
 // export const addNurbsCurve2d = (doc: IGESDocument, degree: number, pts: number[][], closed = false) => {
diff --git a/packages/iges/test/index.ts b/packages/iges/test/index.ts
index b8977f1f15..243d941d87 100644
--- a/packages/iges/test/index.ts
+++ b/packages/iges/test/index.ts
@@ -9,14 +9,12 @@ describe("iges", () => {
             author: "toxi",
             authorOrg: "thi.ng",
             created: new Date(123456789),
-            modified: new Date(123456789),
+            modified: new Date(123456789)
         });
 
-        doc.start = [
-            "Example file for @thi.ng/iges",
-        ];
+        doc.start = ["Example file for @thi.ng/iges"];
 
-        iges.addPolyline2d(doc, [
+        iges.addPolyline(doc, [
             [0, 0],
             [0, 100],
             [50, 150],
diff --git a/packages/iges/tsconfig.json b/packages/iges/tsconfig.json
index bcf03f18b4..b445790069 100644
--- a/packages/iges/tsconfig.json
+++ b/packages/iges/tsconfig.json
@@ -3,9 +3,8 @@
     "compilerOptions": {
         "outDir": ".",
         "module": "es6",
-        "target": "es6"
+        "target": "es6",
+        "preserveConstEnums": false
     },
-    "include": [
-        "./src/**/*.ts"
-    ]
-}
\ No newline at end of file
+    "include": ["./src/**/*.ts"]
+}