diff --git a/csrc/u8g2.h b/csrc/u8g2.h
index bf34f47e..4cef2332 100644
--- a/csrc/u8g2.h
+++ b/csrc/u8g2.h
@@ -256,10 +256,12 @@ struct u8g2_struct
   u8g2_uint_t height;
   
   /* ths is the clip box for the user to check if a specific box has an intersection */
+  /* use u8g2_IsIntersection from u8g2_intersection.c to test against this intersection */
+  /* boundary values are part of the box so that they can be used with u8g2_IsIntersection */
   u8g2_uint_t user_x0;	/* left corner of the buffer */
-  u8g2_uint_t user_x1;	/* right corner of the buffer (excluded) */
-  u8g2_uint_t user_y0;
-  u8g2_uint_t user_y1;
+  u8g2_uint_t user_x1;	/* right corner of the buffer (included) */
+  u8g2_uint_t user_y0;	/* upper edge of the buffer */
+  u8g2_uint_t user_y1;	/* lower edge of the buffer (included) */
   
   /* information about the current font */
   const uint8_t *font;             /* current font for all text procedures */
@@ -393,7 +395,11 @@ void u8g2_ll_hvline_horizontal_right_lsb(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_
 
 /*==========================================*/
 /* u8g2_hvline.c */
+
+/* u8g2_DrawHVLine does not use u8g2_IsIntersection */
 void u8g2_DrawHVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir);
+
+/* the following three function will do an intersection test of this is enabled with U8G2_WITH_INTERSECTION */
 void u8g2_DrawHLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len);
 void u8g2_DrawVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len);
 void u8g2_DrawPixel(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y);
diff --git a/csrc/u8g2_hvline.c b/csrc/u8g2_hvline.c
index 630026cc..a1a18e90 100644
--- a/csrc/u8g2_hvline.c
+++ b/csrc/u8g2_hvline.c
@@ -202,16 +202,34 @@ void u8g2_DrawHVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len
 
 void u8g2_DrawHLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len)
 {
+#ifdef U8G2_WITH_INTERSECTION
+  if ( u8g2_IsIntersection(u8g2, x, y, x+len-1, y) == 0 ) 
+    return;
+#endif /* U8G2_WITH_INTERSECTION */
   u8g2_DrawHVLine(u8g2, x, y, len, 0);
 }
 
 void u8g2_DrawVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len)
 {
+#ifdef U8G2_WITH_INTERSECTION
+  if ( u8g2_IsIntersection(u8g2, x, y, x, y+len-1) == 0 ) 
+    return;
+#endif /* U8G2_WITH_INTERSECTION */
   u8g2_DrawHVLine(u8g2, x, y, len, 1);
 }
 
 void u8g2_DrawPixel(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y)
 {
+#ifdef U8G2_WITH_INTERSECTION
+  if ( x < u8g2->user_x0 )
+    return;
+  if ( x > u8g2->user_x1 )
+    return;
+  if ( y < u8g2->user_y0 )
+    return;
+  if ( y > u8g2->user_y1 )
+    return;
+#endif /* U8G2_WITH_INTERSECTION */
   u8g2_DrawHVLine(u8g2, x, y, 1, 0);
 }
 
diff --git a/csrc/u8g2_intersection.c b/csrc/u8g2_intersection.c
index e937e5d9..04dcea42 100644
--- a/csrc/u8g2_intersection.c
+++ b/csrc/u8g2_intersection.c
@@ -61,7 +61,7 @@
 /*
   calculate the intersection between a0/a1 and v0/v1
   The intersection check returns one if the range of a0/a1 has an intersection with v0/v1.
-  The intersection check includes the boundary values a0 and a1.
+  The intersection check includes the boundary values v1 and a1.
 
   The following asserts will succeed:
     assert( u8g2_is_intersection_decision_tree(4, 6, 7, 9) == 0 );
diff --git a/csrc/u8g2_setup.c b/csrc/u8g2_setup.c
index 85879dea..5b3ac7bc 100644
--- a/csrc/u8g2_setup.c
+++ b/csrc/u8g2_setup.c
@@ -63,9 +63,9 @@ void u8g2_SetupBuffer(u8g2_t *u8g2, uint8_t *buf, uint8_t tile_buf_height, u8g2_
   update dimension: 
   calculate the following variables:
     u8g2_uint_t buf_x0;	left corner of the buffer
-    u8g2_uint_t buf_x1;	right corner of the buffer (excluded)
+    u8g2_uint_t buf_x1;	right corner of the buffer (included)
     u8g2_uint_t buf_y0;
-    u8g2_uint_t buf_y1;
+    u8g2_uint_t buf_y1; 	
 */
 
 static void u8g2_update_dimension_common(u8g2_t *u8g2)
@@ -108,6 +108,9 @@ void u8g2_update_dimension_r0(u8g2_t *u8g2)
   u8g2->user_y0 = u8g2->buf_y0;
   u8g2->user_y1 = u8g2->buf_y1;
   
+  u8g2->user_x1--;
+  u8g2->user_y1--;
+  
 //  printf("x0=%d x1=%d y0=%d y1=%d\n", 
 //      u8g2->user_x0, u8g2->user_x1, u8g2->user_y0, u8g2->user_y1);
 }
@@ -125,6 +128,9 @@ void u8g2_update_dimension_r1(u8g2_t *u8g2)
   u8g2->user_y0 = 0;
   u8g2->user_y1 = u8g2->pixel_buf_width;
   
+  u8g2->user_x1--;
+  u8g2->user_y1--;
+  
 //  printf("x0=%d x1=%d y0=%d y1=%d\n", 
 //      u8g2->user_x0, u8g2->user_x1, u8g2->user_y0, u8g2->user_y1);
 }
@@ -138,6 +144,9 @@ void u8g2_update_dimension_r2(u8g2_t *u8g2)
   
   u8g2->user_y0 = u8g2->height - u8g2->buf_y1;
   u8g2->user_y1 = u8g2->height - u8g2->buf_y0;
+
+  u8g2->user_x1--;
+  u8g2->user_y1--;
   
 //  printf("x0=%d x1=%d y0=%d y1=%d\n", 
 //      u8g2->user_x0, u8g2->user_x1, u8g2->user_y0, u8g2->user_y1);
@@ -155,6 +164,9 @@ void u8g2_update_dimension_r3(u8g2_t *u8g2)
   
   u8g2->user_y0 = 0;
   u8g2->user_y1 = u8g2->pixel_buf_width;
+
+  u8g2->user_x1--;
+  u8g2->user_y1--;
   
 //  printf("x0=%d x1=%d y0=%d y1=%d\n", 
 //      u8g2->user_x0, u8g2->user_x1, u8g2->user_y0, u8g2->user_y1);
diff --git a/sys/utf8/common/u8x8_d_utf8.c b/sys/utf8/common/u8x8_d_utf8.c
index a1d3a761..cc6a4b21 100644
--- a/sys/utf8/common/u8x8_d_utf8.c
+++ b/sys/utf8/common/u8x8_d_utf8.c
@@ -82,13 +82,13 @@ void chgr_show(void)
   unsigned x, y;
   for( y = 0; y < CHGR_HEIGHT/2; y++)
   {
-    printf("%02d ", y*2);
+    printf("%02d|", y*2);
     for( x = 0; x < CHGR_WIDTH/2; x++)
     {
       //printf("%x", chgr_bitmap[y][x]);
       printf("%s", chgr_to_str(chgr_bitmap[y][x]));
     }
-    printf("\n");
+    printf("|\n");
   }
 }
 
diff --git a/sys/utf8/intersection_picture_loop/Makefile b/sys/utf8/intersection_picture_loop/Makefile
new file mode 100644
index 00000000..00ef8ae8
--- /dev/null
+++ b/sys/utf8/intersection_picture_loop/Makefile
@@ -0,0 +1,14 @@
+CC = gcc
+
+CFLAGS = -g -Wall -I../../../csrc/. 
+
+SRC = $(shell ls ../../../csrc/*.c) $(shell ls ../common/*.c ) main.c 
+
+OBJ = $(SRC:.c=.o)
+
+u8g2_utf8: $(OBJ) 
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o u8g2_utf8
+
+clean:	
+	-rm $(OBJ) u8g2_utf8
+
diff --git a/sys/utf8/intersection_picture_loop/main.c b/sys/utf8/intersection_picture_loop/main.c
new file mode 100644
index 00000000..575cb2d8
--- /dev/null
+++ b/sys/utf8/intersection_picture_loop/main.c
@@ -0,0 +1,48 @@
+
+#include "u8g2.h"
+#include <stdio.h>
+
+
+  
+u8g2_t u8g2;
+
+int main(void)
+{
+  int y;
+
+  u8g2_SetupBuffer_Utf8(&u8g2, &u8g2_cb_r0);
+  u8x8_InitDisplay(u8g2_GetU8x8(&u8g2));
+  u8x8_SetPowerSave(u8g2_GetU8x8(&u8g2), 0);  
+  
+  u8g2_SetFont(&u8g2, u8g2_font_5x7_tr);
+  u8g2_SetFontDirection(&u8g2, 0);
+  
+  
+#ifdef U8G2_WITH_HVLINE_COUNT
+    u8g2.hv_cnt = 0UL;
+#endif /* U8G2_WITH_HVLINE_COUNT */   
+    
+    
+    u8g2_FirstPage(&u8g2);
+    do
+    {
+      for( y = 3; y < 21; y++ )
+      {
+	  u8g2_DrawHLine(&u8g2, 3, y, 11);
+      }
+      
+      u8g2_DrawStr(&u8g2, 17, 8, "Test Inter-");
+      u8g2_DrawStr(&u8g2, 17, 16, "section:");
+      u8g2_DrawStr(&u8g2, 17, 24, "One Block");
+      
+
+    } while( u8g2_NextPage(&u8g2) );
+#ifdef U8G2_WITH_HVLINE_COUNT
+    printf("hv cnt: %ld\n", u8g2.hv_cnt);
+#endif /* U8G2_WITH_HVLINE_COUNT */   
+    
+  utf8_show();
+  
+  return 0;
+}
+