diff --git a/src/bin/topola-egui/painter.rs b/src/bin/topola-egui/painter.rs
index 5824c8d..ce287fe 100644
--- a/src/bin/topola-egui/painter.rs
+++ b/src/bin/topola-egui/painter.rs
@@ -16,16 +16,16 @@ impl<'a> Painter<'a> {
         let epaint_shape = match shape {
             Shape::Dot(dot) => epaint::Shape::circle_filled(
                 self.transform
-                    .transform_pos([dot.c.pos.x() as f32, dot.c.pos.y() as f32].into()),
+                    .transform_pos([dot.c.pos.x() as f32, -dot.c.pos.y() as f32].into()),
                 dot.c.r as f32 * self.transform.scale().x,
                 color,
             ),
             Shape::Seg(seg) => epaint::Shape::line_segment(
                 [
                     self.transform
-                        .transform_pos([seg.from.x() as f32, seg.from.y() as f32].into()),
+                        .transform_pos([seg.from.x() as f32, -seg.from.y() as f32].into()),
                     self.transform
-                        .transform_pos([seg.to.x() as f32, seg.to.y() as f32].into()),
+                        .transform_pos([seg.to.x() as f32, -seg.to.y() as f32].into()),
                 ],
                 egui::Stroke::new(seg.width as f32 * self.transform.scale().x, color),
             ),
@@ -42,7 +42,7 @@ impl<'a> Painter<'a> {
                 for i in 0..100 {
                     let x = bend.c.pos.x() + bend.c.r * (angle_from + i as f64 * angle_step).cos();
                     let y = bend.c.pos.y() + bend.c.r * (angle_from + i as f64 * angle_step).sin();
-                    points.push(self.transform.transform_pos([x as f32, y as f32].into()));
+                    points.push(self.transform.transform_pos([x as f32, -y as f32].into()));
                 }
 
                 epaint::Shape::line(
diff --git a/src/bin/topola-sdl2-demo/painter.rs b/src/bin/topola-sdl2-demo/painter.rs
index 274b4c3..4d191e5 100644
--- a/src/bin/topola-sdl2-demo/painter.rs
+++ b/src/bin/topola-sdl2-demo/painter.rs
@@ -21,7 +21,7 @@ impl<'a> Painter<'a> {
             Shape::Dot(dot) => {
                 let mut path = Path2D::new();
                 path.ellipse(
-                    vec2f(dot.c.pos.x() as f32, dot.c.pos.y() as f32),
+                    vec2f(dot.c.pos.x() as f32, -dot.c.pos.y() as f32),
                     dot.c.r as f32,
                     0.0,
                     0.0,
@@ -31,8 +31,8 @@ impl<'a> Painter<'a> {
             }
             Shape::Seg(seg) => {
                 let mut path = Path2D::new();
-                path.move_to(vec2f(seg.from.x() as f32, seg.from.y() as f32));
-                path.line_to(vec2f(seg.to.x() as f32, seg.to.y() as f32));
+                path.move_to(vec2f(seg.from.x() as f32, -seg.from.y() as f32));
+                path.line_to(vec2f(seg.to.x() as f32, -seg.to.y() as f32));
                 self.canvas.set_line_width(seg.width as f32);
                 self.canvas.stroke_path(path);
             }
@@ -45,7 +45,7 @@ impl<'a> Painter<'a> {
 
                 let mut path = Path2D::new();
                 path.arc(
-                    vec2f(bend.c.pos.x() as f32, bend.c.pos.y() as f32),
+                    vec2f(bend.c.pos.x() as f32, -bend.c.pos.y() as f32),
                     bend.circle().r as f32,
                     angle1 as f32,
                     angle2 as f32,
@@ -58,8 +58,8 @@ impl<'a> Painter<'a> {
 
         let envelope = ShapeTrait::envelope(shape, 0.0);
         // XXX: points represented as arrays can't be conveniently converted to vector types
-        let topleft = vec2f(envelope.lower()[0] as f32, envelope.lower()[1] as f32);
-        let bottomright = vec2f(envelope.upper()[0] as f32, envelope.upper()[1] as f32);
+        let topleft = vec2f(envelope.lower()[0] as f32, -envelope.lower()[1] as f32);
+        let bottomright = vec2f(envelope.upper()[0] as f32, -envelope.upper()[1] as f32);
         self.canvas.set_line_width(2.0 / zoom);
         self.canvas
             .set_stroke_style(ColorU::new(100, 100, 100, 255));
diff --git a/src/dsn/design.rs b/src/dsn/design.rs
index 7573a1e..f27a287 100644
--- a/src/dsn/design.rs
+++ b/src/dsn/design.rs
@@ -97,7 +97,7 @@ impl DsnDesign {
                                 Self::add_circle(
                                     &mut layout,
                                     (place.x + pin.x) as f64,
-                                    -(place.y + pin.y) as f64,
+                                    (place.y + pin.y) as f64,
                                     circle.diameter as f64 / 2.0,
                                     layer as u64,
                                     *net_id as i64,
@@ -113,9 +113,9 @@ impl DsnDesign {
                                 Self::add_rect(
                                     &mut layout,
                                     (place.x - pin.x + rect.x1) as f64,
-                                    -(place.y - pin.y + rect.y1) as f64,
+                                    (place.y - pin.y + rect.y1) as f64,
                                     (place.x - pin.x + rect.x2) as f64,
-                                    -(place.y - pin.y + rect.y2) as f64,
+                                    (place.y - pin.y + rect.y2) as f64,
                                     layer as u64,
                                     *net_id as i64,
                                 )
@@ -130,7 +130,7 @@ impl DsnDesign {
                                 Self::add_path(
                                     &mut layout,
                                     (place.x - pin.x) as f64,
-                                    -(place.y - pin.y) as f64,
+                                    (place.y - pin.y) as f64,
                                     &path.coord_vec,
                                     path.width as f64,
                                     layer as u64,
@@ -147,7 +147,7 @@ impl DsnDesign {
                                 Self::add_path(
                                     &mut layout,
                                     (place.x - pin.x) as f64,
-                                    -(place.y - pin.y) as f64,
+                                    (place.y - pin.y) as f64,
                                     &polygon.coord_vec,
                                     polygon.width as f64,
                                     layer as u64,
@@ -184,7 +184,7 @@ impl DsnDesign {
                         Self::add_circle(
                             &mut layout,
                             via.x as f64,
-                            -via.y as f64,
+                            via.y as f64,
                             circle.diameter as f64 / 2.0,
                             layer as u64,
                             net_id as i64,
@@ -399,7 +399,7 @@ impl DsnDesign {
         let mut prev_index = layout
             .add_fixed_dot(FixedDotWeight {
                 circle: Circle {
-                    pos: (offset_x + coords[0].x as f64, offset_y - coords[0].y as f64).into(),
+                    pos: (offset_x + coords[0].x as f64, offset_y + coords[0].y as f64).into(),
                     r: width / 2.0,
                 },
                 layer,
@@ -412,7 +412,7 @@ impl DsnDesign {
             let index = layout
                 .add_fixed_dot(FixedDotWeight {
                     circle: Circle {
-                        pos: (offset_x + coord.x as f64, offset_y - coord.y as f64).into(),
+                        pos: (offset_x + coord.x as f64, offset_y + coord.y as f64).into(),
                         r: width / 2.0,
                     },
                     layer,