diff --git a/chr6.c b/chr6.c
index cc1c22e..a66c81c 100644
--- a/chr6.c
+++ b/chr6.c
@@ -61,6 +61,12 @@ inspt(Point* p, int w, int h)
 	return p->x >= 0 && p->y >= 0 && p->x < w && p->y < h;
 }
 
+int
+dispt(Point* a, Point* b)
+{
+	return ((b->x - a->x) * (b->x - a->x)) + ((b->y - a->y) * (b->y - a->y));
+}
+
 /* Draw */
 
 void
@@ -134,13 +140,13 @@ write(int tx, int ty, int px, int py, int color)
 void
 edit(int x, int y, int color)
 {
-	if(x < 0 || y < 0 || x > 8 * HOR * ZOOM || y > 8 * VER * ZOOM)
+	if(x < 0 || y < 0 || x > 8 * HOR || y > 8 * VER)
 		return;
 	write(
-	    x / (8 * ZOOM),
-	    y / (8 * ZOOM),
-	    (x / ZOOM) % 8,
-	    (y / ZOOM) % 8,
+	    x / (8),
+	    y / (8),
+	    x % 8,
+	    y % 8,
 	    color);
 }
 
@@ -173,7 +179,7 @@ fill(Brush* b, int mode, int size, Point p0, int color)
 		for(y = -size / 2; y < size; ++y) {
 			setpt(&p, p0.x + x, p0.y + y);
 			if(patt(p.x, p.y, mode, size))
-				edit(p.x - PAD, p.y - PAD, color);
+				edit(p.x, p.y, color);
 		}
 	b->edit = 1;
 	redraw(pixels);
@@ -182,11 +188,11 @@ fill(Brush* b, int mode, int size, Point p0, int color)
 void
 line(Point* p0, Point* p1, int color)
 {
-	double dx = abs(p1->x - p0->x), sx = p0->x < p1->x ? 1 : -1;
-	double dy = -abs(p1->y - p0->y), sy = p0->y < p1->y ? 1 : -1;
-	double err = dx + dy, e2;
+	int dx = abs(p1->x - p0->x), sx = p0->x < p1->x ? 1 : -1;
+	int dy = -abs(p1->y - p0->y), sy = p0->y < p1->y ? 1 : -1;
+	int err = dx + dy, e2;
 	for(;;) {
-		edit(p0->x - PAD, p0->y - PAD, color);
+		edit(p0->x, p0->y, color);
 		if(p0->x == p1->x && p0->y == p1->y)
 			break;
 		e2 = 2 * err;
@@ -207,10 +213,10 @@ erase(Brush* b)
 {
 	int i, id;
 	Point p1;
-	setpt(&p1, b->pos.x - PAD, b->pos.y - PAD);
-	if(!inspt(&p1, 8 * HOR * ZOOM, 8 * VER * ZOOM))
+	setpt(&p1, b->pos.x, b->pos.y);
+	if(!inspt(&p1, 8 * HOR, 8 * VER))
 		return;
-	id = (p1.x / (8 * ZOOM)) + (p1.y / (8 * ZOOM)) * 16;
+	id = (p1.x / 8) + (p1.y / 8) * 16;
 	for(i = 0; i < 8; ++i) {
 		buffer[(id * 16) + i] = 0x00;
 		buffer[(id * 16) + i + 8] = 0x00;
@@ -305,15 +311,21 @@ domouse(SDL_Event* event, Brush* b)
 			b->down = 1;
 		if(event->button.button == SDL_BUTTON_RIGHT)
 			b->erase = 1;
-		setpt(&b->prev, event->motion.x, event->motion.y);
+		setpt(&b->prev,
+		      (event->motion.x - PAD) / ZOOM,
+		      (event->motion.y - PAD) / ZOOM);
 	case SDL_MOUSEMOTION:
 		if(b->down) {
-			setpt(&b->pos, event->motion.x, event->motion.y);
-			if(b->mode == 0)
-				line(&b->prev, &b->pos, b->erase ? 0 : b->color);
-			else
-				fill(b, b->mode, b->size, b->pos, b->erase ? 0 : b->color);
-			setpt(&b->prev, b->pos.x, b->pos.y);
+			setpt(&b->pos,
+			      (event->motion.x - PAD) / ZOOM,
+			      (event->motion.y - PAD) / ZOOM);
+			if(dispt(&b->pos, &b->prev) > ZOOM * 2) {
+				if(b->mode == 0)
+					line(&b->prev, &b->pos, b->erase ? 0 : b->color);
+				else
+					fill(b, b->mode, b->size, b->pos, b->erase ? 0 : b->color);
+				setpt(&b->prev, b->pos.x, b->pos.y);
+			}
 		}
 		break;
 	}
@@ -399,6 +411,7 @@ int
 main(int argc, char** argv)
 {
 	int ticknext = 0;
+	Point a, b;
 	Brush brush;
 	brush.down = 0;
 	brush.color = 1;