diff --git a/compiler/res/prog8lib/c64/graphics.p8 b/compiler/res/prog8lib/c64/graphics.p8
index bb30e81ab..e2eaec21b 100644
--- a/compiler/res/prog8lib/c64/graphics.p8
+++ b/compiler/res/prog8lib/c64/graphics.p8
@@ -34,7 +34,6 @@ graphics {
     sub line(uword @zp x1, ubyte @zp y1, uword @zp x2, ubyte @zp y2) {
         ; Bresenham algorithm.
         ; This code special-cases various quadrant loops to allow simple ++ and -- operations.
-        ; TODO there are some slight errors at the first/last pixels in certain slopes...??
         if y1>y2 {
             ; make sure dy is always positive to have only 4 instead of 8 special cases
             swap(x1, x2)
@@ -62,8 +61,8 @@ graphics {
             dx = -dx
             positive_ix = false
         }
-        dx *= 2
-        dy *= 2
+        word @zp dx2 = dx*2
+        word @zp dy2 = dy*2
         internal_plotx = x1
 
         if dx >= dy {
@@ -73,10 +72,10 @@ graphics {
                     if internal_plotx==x2
                         return
                     internal_plotx++
-                    d += dy
+                    d += dy2
                     if d > dx {
                         y1++
-                        d -= dx
+                        d -= dx2
                     }
                 }
             } else {
@@ -85,10 +84,10 @@ graphics {
                     if internal_plotx==x2
                         return
                     internal_plotx--
-                    d += dy
+                    d += dy2
                     if d > dx {
                         y1++
-                        d -= dx
+                        d -= dx2
                     }
                 }
             }
@@ -100,10 +99,10 @@ graphics {
                     if y1 == y2
                         return
                     y1++
-                    d += dx
+                    d += dx2
                     if d > dy {
                         internal_plotx++
-                        d -= dy
+                        d -= dy2
                     }
                 }
             } else {
@@ -112,10 +111,10 @@ graphics {
                     if y1 == y2
                         return
                     y1++
-                    d += dx
+                    d += dx2
                     if d > dy {
                         internal_plotx--
-                        d -= dy
+                        d -= dy2
                     }
                 }
             }
diff --git a/examples/test.p8 b/examples/test.p8
index eea8e3969..bbe15a292 100644
--- a/examples/test.p8
+++ b/examples/test.p8
@@ -1,39 +1,32 @@
-%import textio
+%import graphics
 %import floats
-%import test_stack
-%zeropage dontuse
 
 
 main {
     sub start() {
+
+        graphics.enable_bitmap_mode()
+
         uword xx
-        float fl
-        float fltotal=0.0
-        ubyte ub = 22
+        ubyte yy
 
-        ub = 22
-        fl = ub as float
-        floats.print_f(fl)
-        txt.nl()
-        ub = 255
-        fl = ub as float
-        floats.print_f(fl)
-        txt.nl()
-        xx = 123
-        fl = xx as float
-        floats.print_f(fl)
-        txt.nl()
-        xx = 55555
-        fl = xx as float
-        floats.print_f(fl)
-        txt.nl()
+        graphics.line(150,50,150,50)
 
-        fltotal=0.0
-        for xx in 1 to 255 {
-            fl = xx as float
-            fltotal = fl * fl
+        for yy in 0 to 199-60 step 16 {
+
+            for xx in 0 to 319-50 step 16 {
+                graphics.line(30+xx, 10+yy, 50+xx, 30+yy)
+                graphics.line(49+xx, 30+yy, 10+xx, 30+yy)
+                graphics.line(11+xx, 29+yy, 29+xx, 11+yy)
+
+                ; triangle 2, counter-clockwise
+                graphics.line(30+xx, 40+yy, 10+xx, 60+yy)
+                graphics.line(11+xx, 60+yy, 50+xx, 60+yy)
+                graphics.line(49+xx, 59+yy, 31+xx,41+yy)
+            }
         }
 
-        test_stack.test()
+        repeat {
+        }
     }
 }