diff --git a/src/App.tsx b/src/App.tsx
index dc244fe92..fc020790e 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -3,14 +3,9 @@ import { Canvas } from '@react-three/fiber'
 import { Allotment } from 'allotment'
 import { OrbitControls, OrthographicCamera } from '@react-three/drei'
 import { lexer } from './lang/tokeniser'
-import {
-  abstractSyntaxTree,
-  getNodePathFromSourceRange,
-  getNodeFromPath
-} from './lang/abstractSyntaxTree'
+import { abstractSyntaxTree } from './lang/abstractSyntaxTree'
 import { executor, processShownObjects, ViewerArtifact } from './lang/executor'
 import { recast } from './lang/recast'
-import { BufferGeometry } from 'three'
 import CodeMirror from '@uiw/react-codemirror'
 import { javascript } from '@codemirror/lang-javascript'
 import { ViewUpdate } from '@codemirror/view'
@@ -19,12 +14,12 @@ import {
   addLineHighlight,
 } from './editor/highlightextension'
 import { useStore } from './useStore'
-import { isOverlapping } from './lib/utils'
 import { Toolbar } from './Toolbar'
 import { BasePlanes } from './components/BasePlanes'
 import { SketchPlane } from './components/SketchPlane'
 import { Logs } from './components/Logs'
 import { AxisIndicator } from './components/AxisIndicator'
+import { RenderViewerArtifacts } from './components/SketchLine'
 
 const OrrthographicCamera = OrthographicCamera as any
 
@@ -160,7 +155,7 @@ function App() {
                 <OrbitControls
                   enableDamping={false}
                   enablePan
-                  enableRotate
+                  enableRotate={!(guiMode.mode === 'canEditSketch' || guiMode.mode === 'sketch')}
                   enableZoom
                   reverseOrbit={false}
                 />
@@ -199,111 +194,3 @@ function App() {
 }
 
 export default App
-
-function Line({
-  geo,
-  sourceRange,
-  forceHighlight = false,
-}: {
-  geo: BufferGeometry
-  sourceRange: [number, number]
-  forceHighlight?: boolean
-}) {
-  const { setHighlightRange, selectionRange, guiMode, setGuiMode, ast } =
-    useStore(
-      ({ setHighlightRange, selectionRange, guiMode, setGuiMode, ast }) => ({
-        setHighlightRange,
-        selectionRange,
-        guiMode,
-        setGuiMode,
-        ast,
-      })
-    )
-  // This reference will give us direct access to the mesh
-  const ref = useRef<BufferGeometry | undefined>() as any
-  const [hovered, setHover] = useState(false)
-  const [editorCursor, setEditorCursor] = useState(false)
-  const [didSetCanEdit, setDidSetCanEdit] = useState(false)
-  useEffect(() => {
-    const shouldHighlight = isOverlapping(sourceRange, selectionRange)
-    setEditorCursor(shouldHighlight)
-    if (shouldHighlight && guiMode.mode === 'default' && ast) {
-      const pathToNode = getNodePathFromSourceRange(ast, sourceRange)
-      const piper = getNodeFromPath(ast, pathToNode, 'PipeExpression')
-      const axis = piper.type !== 'PipeExpression' ? 'xy'
-        : piper?.body?.[1]?.callee?.name === 'rx' ? 'xz' : 'yz'
-      setGuiMode({ mode: 'canEditSketch', pathToNode, axis })
-      setDidSetCanEdit(true)
-    } else if (
-      !shouldHighlight &&
-      didSetCanEdit &&
-      guiMode.mode === 'canEditSketch'
-    ) {
-      setGuiMode({ mode: 'default' })
-      setDidSetCanEdit(false)
-    }
-  }, [selectionRange, sourceRange])
-
-  return (
-    <mesh
-      ref={ref}
-      onPointerOver={(event) => {
-        setHover(true)
-        setHighlightRange(sourceRange)
-      }}
-      onPointerOut={(event) => {
-        setHover(false)
-        setHighlightRange([0, 0])
-      }}
-    >
-      <primitive object={geo} />
-      <meshStandardMaterial
-        color={
-          hovered
-            ? 'hotpink'
-            : editorCursor || forceHighlight
-            ? 'skyblue'
-            : 'orange'
-        }
-      />
-    </mesh>
-  )
-}
-
-function RenderViewerArtifacts({
-  artifact,
-  forceHighlight = false,
-}: {
-  artifact: ViewerArtifact
-  forceHighlight?: boolean
-}) {
-  const { selectionRange } = useStore(({ selectionRange }) => ({
-    selectionRange,
-  }))
-  const [editorCursor, setEditorCursor] = useState(false)
-  useEffect(() => {
-    const shouldHighlight = isOverlapping(artifact.sourceRange, selectionRange)
-    setEditorCursor(shouldHighlight)
-  }, [selectionRange, artifact.sourceRange])
-  if (artifact.type === 'sketchLine') {
-    const { geo, sourceRange } = artifact
-    return (
-      <Line
-        geo={geo}
-        sourceRange={sourceRange}
-        forceHighlight={forceHighlight || editorCursor}
-      />
-    )
-  }
-  return (
-    <>
-      {artifact.children.map((artifact, index) => (
-        <RenderViewerArtifacts
-          artifact={artifact}
-          key={index}
-          forceHighlight={forceHighlight || editorCursor}
-        />
-      ))}
-    </>
-  )
-}
diff --git a/src/components/SketchLine.tsx b/src/components/SketchLine.tsx
new file mode 100644
index 000000000..be293de41
--- /dev/null
+++ b/src/components/SketchLine.tsx
@@ -0,0 +1,274 @@
+import { useRef, useState, useEffect, useMemo } from 'react'
+import {
+  getNodePathFromSourceRange,
+  getNodeFromPath,
+  CallExpression,
+  changeArguments,
+} from '../lang/abstractSyntaxTree'
+import { ViewerArtifact } from '../lang/executor'
+import { BufferGeometry } from 'three'
+import { useStore } from '../useStore'
+import { isOverlapping } from '../lib/utils'
+import { LineGeos } from '../lang/engine'
+import { Vector3 } from 'three'
+
+function useHeightlight(sourceRange: [number, number]) {
+  const { selectionRange, guiMode, setGuiMode, ast } = useStore((s) => ({
+    setHighlightRange: s.setHighlightRange,
+    selectionRange: s.selectionRange,
+    guiMode: s.guiMode,
+    setGuiMode: s.setGuiMode,
+    ast: s.ast,
+  }))
+  // This reference will give us direct access to the mesh
+  const [editorCursor, setEditorCursor] = useState(false)
+  const [didSetCanEdit, setDidSetCanEdit] = useState(false)
+  useEffect(() => {
+    const shouldHighlight = isOverlapping(sourceRange, selectionRange)
+    setEditorCursor(shouldHighlight)
+    if (shouldHighlight && guiMode.mode === 'default' && ast) {
+      const pathToNode = getNodePathFromSourceRange(ast, sourceRange)
+      const piper = getNodeFromPath(ast, pathToNode, 'PipeExpression')
+      const axis =
+        piper.type !== 'PipeExpression'
+          ? 'xy'
+          : piper?.body?.[1]?.callee?.name === 'rx'
+          ? 'xz'
+          : 'yz'
+      setGuiMode({ mode: 'canEditSketch', pathToNode, axis })
+      setDidSetCanEdit(true)
+    } else if (
+      !shouldHighlight &&
+      didSetCanEdit &&
+      guiMode.mode === 'canEditSketch'
+    ) {
+      setGuiMode({ mode: 'default' })
+      setDidSetCanEdit(false)
+    }
+  }, [selectionRange, sourceRange])
+  return {
+    editorCursor,
+  }
+}
+
+function SketchLine({
+  geo,
+  sourceRange,
+  forceHighlight = false,
+}: {
+  geo: LineGeos
+  sourceRange: [number, number]
+  forceHighlight?: boolean
+}) {
+  const { editorCursor } = useHeightlight(sourceRange)
+  const { setHighlightRange } = useStore(
+    ({ setHighlightRange, selectionRange, guiMode, setGuiMode, ast }) => ({
+      setHighlightRange,
+      selectionRange,
+      guiMode,
+      setGuiMode,
+      ast,
+    })
+  )
+  // This reference will give us direct access to the mesh
+  const ref = useRef<BufferGeometry | undefined>() as any
+  const [hovered, setHover] = useState(false)
+
+  return (
+    <>
+      <mesh
+        ref={ref}
+        onPointerOver={(event) => {
+          setHover(true)
+          setHighlightRange(sourceRange)
+        }}
+        onPointerOut={(event) => {
+          setHover(false)
+          setHighlightRange([0, 0])
+        }}
+      >
+        <primitive object={geo.line} />
+        <meshStandardMaterial
+          color={
+            hovered
+              ? 'hotpink'
+              : editorCursor || forceHighlight
+              ? 'skyblue'
+              : 'orange'
+          }
+        />
+      </mesh>
+      <MovingSphere
+        geo={geo.tip}
+        sourceRange={sourceRange}
+        editorCursor={editorCursor || forceHighlight}
+      />
+    </>
+  )
+}
+
+const roundOff = (num: number, places: number): number => {
+  const x = Math.pow(10, places)
+  return Math.round(num * x) / x
+}
+
+function MovingSphere({
+  geo,
+  sourceRange,
+  editorCursor,
+}: {
+  geo: BufferGeometry
+  sourceRange: [number, number]
+  editorCursor: boolean
+}) {
+  const ref = useRef<BufferGeometry | undefined>() as any
+  const lastPointerRef = useRef<Vector3>(new Vector3())
+  const [hovered, setHover] = useState(false)
+  const [isMouseDown, setIsMouseDown] = useState(false)
+
+  const { setHighlightRange, guiMode, ast, updateAst } = useStore((s) => ({
+    setHighlightRange: s.setHighlightRange,
+    selectionRange: s.selectionRange,
+    guiMode: s.guiMode,
+    setGuiMode: s.setGuiMode,
+    ast: s.ast,
+    updateAst: s.updateAst,
+  }))
+  const { originalXY } = useMemo(() => {
+    if (ast) {
+      const thePath = getNodePathFromSourceRange(ast, sourceRange)
+      const callExpression = getNodeFromPath(ast, thePath) as CallExpression
+      const [xArg, yArg] = callExpression?.arguments || []
+      const x = xArg?.type === 'Literal' ? xArg.value : -1
+      const y = yArg?.type === 'Literal' ? yArg.value : -1
+      console.log(callExpression)
+      return {
+        originalXY: [x, y],
+      }
+    }
+    return {
+      originalXY: [-1, -1],
+    }
+  }, [ast])
+
+  useEffect(() => {
+    const handleMouseUp = () => {
+      if (isMouseDown && ast) {
+        const thePath = getNodePathFromSourceRange(ast, sourceRange)
+        const theNewPoints: [number, number] = [
+          roundOff(lastPointerRef.current.x, 2),
+          roundOff(lastPointerRef.current.y, 2),
+        ]
+        console.log('theNewPoints', theNewPoints)
+        const { modifiedAst } = changeArguments(ast, thePath, theNewPoints)
+        updateAst(modifiedAst)
+        ref.current.position.set(0, 0, 0)
+      }
+      setIsMouseDown(false)
+    }
+    window.addEventListener('mouseup', handleMouseUp)
+    return () => {
+      window.removeEventListener('mouseup', handleMouseUp)
+    }
+  }, [isMouseDown, ast])
+
+  return (
+    <>
+      <mesh
+        ref={ref}
+        onPointerOver={(event) => {
+          setHover(true)
+          setHighlightRange(sourceRange)
+        }}
+        onPointerOut={(event) => {
+          setHover(false)
+          setHighlightRange([0, 0])
+        }}
+        onPointerDown={() => setIsMouseDown(true)}
+      >
+        <primitive object={geo} scale={hovered ? 2 : 1} />
+        <meshStandardMaterial
+          color={hovered ? 'hotpink' : editorCursor ? 'skyblue' : 'orange'}
+        />
+      </mesh>
+      {isMouseDown && (
+        <mesh
+          position={[0, 0, 0.05]}
+          onPointerMove={(a) => {
+            const point = a.point
+            if (
+              lastPointerRef.current.x === 0 &&
+              lastPointerRef.current.y === 0 &&
+              lastPointerRef.current.z === 0
+            ) {
+              lastPointerRef.current.set(point.x, point.y, point.z)
+              return
+            }
+            if (guiMode.mode)
+              if (ref.current) {
+                const diff = new Vector3().subVectors(
+                  point,
+                  lastPointerRef.current
+                )
+                console.log(originalXY)
+                if (originalXY[0] === -1) {
+                  diff.x = 0
+                }
+                if (originalXY[1] === -1) {
+                  diff.y = 0
+                }
+                ref.current.position.add(diff)
+                lastPointerRef.current.set(point.x, point.y, point.z)
+              }
+          }}
+          name="my-mesh"
+        >
+          <planeGeometry args={[50, 50]} />
+          <meshStandardMaterial color="blue" transparent opacity={0.2} />
+        </mesh>
+      )}
+    </>
+  )
+}
+
+export function RenderViewerArtifacts({
+  artifact,
+  forceHighlight = false,
+}: {
+  artifact: ViewerArtifact
+  forceHighlight?: boolean
+}) {
+  const { selectionRange } = useStore(({ selectionRange }) => ({
+    selectionRange,
+  }))
+  const [editorCursor, setEditorCursor] = useState(false)
+  useEffect(() => {
+    const shouldHighlight = isOverlapping(artifact.sourceRange, selectionRange)
+    setEditorCursor(shouldHighlight)
+  }, [selectionRange, artifact.sourceRange])
+  if (artifact.type === 'sketchLine') {
+    const { geo, sourceRange } = artifact
+    return (
+      <SketchLine
+        geo={geo}
+        sourceRange={sourceRange}
+        forceHighlight={forceHighlight || editorCursor}
+      />
+    )
+  }
+  if (artifact.type === 'sketchBase') {
+    console.log('BASE TODO')
+    return null
+  }
+  return (
+    <>
+      {artifact.children.map((artifact, index) => (
+        <RenderViewerArtifacts
+          artifact={artifact}
+          key={index}
+          forceHighlight={forceHighlight || editorCursor}
+        />
+      ))}
+    </>
+  )
+}
diff --git a/src/lang/abstractSyntaxTree.ts b/src/lang/abstractSyntaxTree.ts
index 66442e381..47fe73af7 100644
--- a/src/lang/abstractSyntaxTree.ts
+++ b/src/lang/abstractSyntaxTree.ts
@@ -1215,6 +1215,38 @@ export function addLine(
   }
 }
 
+export function changeArguments(
+  node: Program,
+  pathToNode: (string | number)[],
+  args: [number, number]
+): { modifiedAst: Program; pathToNode: (string | number)[] }{
+  const _node = { ...node }
+  const dumbyStartend = { start: 0, end: 0 }
+  // const thePath = getNodePathFromSourceRange(_node, sourceRange)
+  const callExpression = getNodeFromPath(_node, pathToNode) as CallExpression
+  const newXArg: CallExpression['arguments'][number] = callExpression.arguments[0].type === 'Literal' ? {
+    type: 'Literal',
+    ...dumbyStartend,
+    value: args[0],
+    raw: `${args[0]}`,
+  } : {
+    ...callExpression.arguments[0]
+  }
+  const newYArg: CallExpression['arguments'][number] = callExpression.arguments[1].type === 'Literal' ? {
+    type: 'Literal',
+    ...dumbyStartend,
+    value: args[1],
+    raw: `${args[1]}`,
+  } : {
+    ...callExpression.arguments[1]
+  }
+  callExpression.arguments = [newXArg, newYArg]
+  return {
+    modifiedAst: _node,
+    pathToNode,
+  }
+}
+
 function isCallExpression(tokens: Token[], index: number): number {
   const currentToken = tokens[index]
   const veryNextToken = tokens[index + 1] // i.e. no whitespace
diff --git a/src/lang/engine.tsx b/src/lang/engine.tsx
index 517d3e494..38bfc7c79 100644
--- a/src/lang/engine.tsx
+++ b/src/lang/engine.tsx
@@ -7,15 +7,21 @@ export function baseGeo({ from }: { from: [number, number, number] }) {
   return baseSphere
 }
 
+export interface LineGeos {
+  line: BufferGeometry
+  tip: BufferGeometry
+  centre: BufferGeometry
+}
+
 export function lineGeo({
   from,
   to,
 }: {
   from: [number, number, number]
   to: [number, number, number]
-}): BufferGeometry {
+}): LineGeos {
   const sq = (a: number): number => a * a
-  const center = [
+  const centre = [
     (from[0] + to[0]) / 2,
     (from[1] + to[1]) / 2,
     (from[2] + to[2]) / 2,
@@ -34,15 +40,23 @@ export function lineGeo({
   const lineBody = new BoxGeometry(Hypotenuse3d, 0.1, 0.1)
   lineBody.rotateY(ang1)
   lineBody.rotateZ(ang2)
-  lineBody.translate(center[0], center[1], center[2])
+  lineBody.translate(centre[0], centre[1], centre[2])
 
   // create line end balls with SphereGeometry at `to` and `from` with radius of 0.15
   const lineEnd1 = new SphereGeometry(0.15)
   lineEnd1.translate(to[0], to[1], to[2])
+
+  const centreSphere = new SphereGeometry(0.15)
+  centreSphere.translate(centre[0], centre[1], centre[2])
   // const lineEnd2 = new SphereGeometry(0.15);
   // lineEnd2.translate(from[0], from[1], from[2])
 
   // group all three geometries
-  return mergeBufferGeometries([lineBody, lineEnd1])
+  // return mergeBufferGeometries([lineBody, lineEnd1])
   // return mergeBufferGeometries([lineBody, lineEnd1, lineEnd2]);
+  return {
+    line: lineBody,
+    tip: lineEnd1,
+    centre: centreSphere,
+  }
 }
diff --git a/src/lang/executor.ts b/src/lang/executor.ts
index 6a76e87ef..aaed9f76b 100644
--- a/src/lang/executor.ts
+++ b/src/lang/executor.ts
@@ -6,6 +6,7 @@ import {
 } from './abstractSyntaxTree'
 import { Path, Transform, SketchGeo, sketchFns } from './sketch'
 import { BufferGeometry } from 'three'
+import { LineGeos } from './engine'
 
 export interface ProgramMemory {
   root: { [key: string]: any }
@@ -296,8 +297,13 @@ export type ViewerArtifact =
   | {
       type: 'sketchLine'
       sourceRange: SourceRange
-      geo: BufferGeometry
+      geo: LineGeos
     }
+  | {
+      type: 'sketchBase',
+      sourceRange: SourceRange,
+      geo: BufferGeometry
+  }
   | {
       type: 'parent'
       sourceRange: SourceRange
@@ -315,20 +321,44 @@ export const processShownObjects = (
   previousTransforms: PreviousTransforms = []
 ): ViewerArtifact[] => {
   if (geoMeta?.type === 'sketchGeo') {
-    return geoMeta.sketch.map(({ geo, sourceRange }) => {
-      const newGeo = geo.clone()
-      previousTransforms.forEach(({ rotation, transform }) => {
-        newGeo.rotateX(rotation[0])
-        newGeo.rotateY(rotation[1])
-        newGeo.rotateZ(rotation[2])
-        newGeo.translate(transform[0], transform[1], transform[2])
-      })
-
-      return {
-        type: 'sketchLine',
-        geo: newGeo,
-        sourceRange,
+    return geoMeta.sketch.map(({ geo, sourceRange, type }) => {
+      if(type === 'toPoint') {
+        // const newGeo = geo.clone()
+        const newGeo: LineGeos = {
+            line: geo.line.clone(),
+            tip: geo.tip.clone(),
+            centre: geo.centre.clone(),
+        }
+        previousTransforms.forEach(({ rotation, transform }) => {
+          Object.values(newGeo).forEach((geoItem) => {
+            geoItem.rotateX(rotation[0])
+            geoItem.rotateY(rotation[1])
+            geoItem.rotateZ(rotation[2])
+            geoItem.translate(transform[0], transform[1], transform[2])
+          })
+        })
+        return {
+          type: 'sketchLine',
+          geo: newGeo,
+          sourceRange,
+        }
+      } else if(type === 'base') {
+        const newGeo = geo.clone()
+        previousTransforms.forEach(({ rotation, transform }) => {
+          newGeo.rotateX(rotation[0])
+          newGeo.rotateY(rotation[1])
+          newGeo.rotateZ(rotation[2])
+          newGeo.translate(transform[0], transform[1], transform[2])
+        })
+        return {
+          type: 'sketchBase',
+          geo: newGeo,
+          sourceRange,
+        }
       }
+      console.log('type',type)
+      
+      throw new Error('Unknown geo type')
     })
   } else if (geoMeta.type === 'transform') {
     const referencedVar = geoMeta.sketch
diff --git a/src/lang/sketch.ts b/src/lang/sketch.ts
index d6f1e5e72..3a7869714 100644
--- a/src/lang/sketch.ts
+++ b/src/lang/sketch.ts
@@ -1,5 +1,5 @@
 import { ProgramMemory } from './executor'
-import { lineGeo, baseGeo } from './engine'
+import { lineGeo, baseGeo, LineGeos } from './engine'
 import { BufferGeometry } from 'three'
 
 type Coords2d = [number, number]
@@ -37,7 +37,7 @@ export type Path =
       name?: string
       to: Coords2d
       previousPath: Path
-      geo: BufferGeometry
+      geo: LineGeos
       sourceRange: SourceRange
     }
   | {
@@ -45,7 +45,7 @@ export type Path =
       name?: string
       firstPath: Path
       previousPath: Path
-      geo: BufferGeometry
+      geo: LineGeos
       sourceRange: SourceRange
     }
   | {