Reset graphic context

@@ -321,6 +321,10 @@ class PdfGraphics {
     buf.putString(']TJ ET\n');
   }
 
+  void reset() {
+    buf.putString('0 Tr\n');
+  }
+
   /// Sets the color for drawing
   void setColor(PdfColor color) {
     setFillColor(color);

@@ -212,8 +212,9 @@ class MultiPage extends Page {
           pageFormat: pageFormat,
           index: index == null ? null : (index++),
         );
-        context =
-            baseContext.copyWith(page: pdfPage, canvas: pdfPage.getGraphics());
+        final canvas = pdfPage.getGraphics();
+        canvas.reset();
+        context = baseContext.copyWith(page: pdfPage, canvas: canvas);
 
         assert(() {
           if (Document.debug) {

@@ -111,6 +111,7 @@ class Page {
 
   void postProcess(Document document) {
     final canvas = _pdfPage.getGraphics();
+    canvas.reset();
     final _margin = margin;
     var constraints = mustRotate
         ? BoxConstraints(