diff --git a/gtkarea/draw_windows.c b/winarea/draw.c
similarity index 100%
rename from gtkarea/draw_windows.c
rename to winarea/draw.c
diff --git a/winarea/ui.h b/winarea/ui.h
new file mode 100644
index 00000000..77236099
--- /dev/null
+++ b/winarea/ui.h
@@ -0,0 +1,141 @@
+// 4 september 2015
+
+typedef struct uiArea uiArea;
+typedef struct uiAreaHandler uiAreaHandler;
+typedef struct uiAreaDrawParams uiAreaDrawParams;
+
+typedef struct uiDrawContext uiDrawContext;
+
+struct uiAreaHandler {
+	void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
+	uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
+	uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
+};
+
+struct uiAreaDrawParams {
+	uiDrawContext *Context;
+
+	intmax_t ClientWidth;
+	intmax_t ClientHeight;
+
+	intmax_t ClipX;
+	intmax_t ClipY;
+	intmax_t ClipWidth;
+	intmax_t ClipHeight;
+
+	int DPIX;
+	int DPIY;
+
+	intmax_t HScrollPos;
+	intmax_t VScrollPos;
+};
+
+// TODO proper sources
+// TODO dotting/dashing
+
+typedef struct uiDrawStrokeParams uiDrawStrokeParams;
+typedef enum uiDrawLineCap uiDrawLineCap;
+typedef enum uiDrawLineJoin uiDrawLineJoin;
+typedef enum uiDrawFillMode uiDrawFillMode;
+
+enum uiDrawLineCap {
+	uiDrawLineCapFlat,
+	uiDrawLineCapRound,
+	uiDrawLineCapSquare,
+};
+
+enum uiDrawLineJoin {
+	uiDrawLineJoinMiter,
+	uiDrawLineJoinRound,
+	uiDrawLineJoinBevel,
+};
+
+// this is the default for botoh cairo and GDI
+// Core Graphics doesn't explicitly specify a default, but NSBezierPath allows you to choose one, and this is the initial value
+// so we're good to use it too!
+#define uiDrawDefaultMiterLimit 10.0
+
+// TODOs
+// - windows: SetPolyFillMode
+// - os x: FillPath/EOFillPath functions
+enum uiDrawFillMode {
+	uiDrawFillModeWinding,
+	// TODO rename to EvenOdd?
+	uiDrawFillModeAlternate,
+};
+
+struct uiDrawStrokeParams {
+	uiDrawLineCap Cap;
+	uiDrawLineJoin Join;
+	intmax_t Thickness;
+	// TODO float for GDI?
+	double MiterLimit;
+};
+
+void uiDrawBeginPathRGB(uiDrawContext *, uint8_t, uint8_t, uint8_t);
+void uiDrawBeginPathRGBA(uiDrawContext *, uint8_t, uint8_t, uint8_t, uint8_t);
+
+void uiDrawMoveTo(uiDrawContext *, intmax_t, intmax_t);
+void uiDrawLineTo(uiDrawContext *, intmax_t, intmax_t);
+void uiDrawRectangle(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t);
+// notes: angles are both relative to 0 and go counterclockwise
+void uiDrawArc(uiDrawContext *, intmax_t, intmax_t, intmax_t, double, double, int);
+// TODO behavior when there is no initial point on Windows and OS X
+void uiDrawBezierTo(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t);
+void uiDrawCloseFigure(uiDrawContext *);
+
+void uiDrawStroke(uiDrawContext *, uiDrawStrokeParams *);
+void uiDrawFill(uiDrawContext *, uiDrawFillMode);
+
+// path functions
+// cairo			gdi						core graphics
+// move_to		MoveToEx				MoveToPoint
+// line_to			LineTo					AddLineToPoint
+// arc			Arc/ArcTo/AngleArc/Pie		AddArc/AddArcToPoint/AddEllipseInRect
+// arc_negative	Arc/ArcTo/AngleArc/Pie		AddArc/AddArcToPoint
+// curve_to		PolyBezier/PolyBezierTo		AddCurveToPoint
+// rectangle		Rectangle					AddRect
+// [arc functions?]	Chord					[arc functions?]
+// [combination]	RoundRect				[same way as cairo?]
+// [TODO pango]	TextOut/ExtTextOut			[TODO core text]
+// [TODO]		[TODO]					AddQuadCurveToPoint
+
+// on sources:
+// cairo:
+// - RGB
+// - RGBA
+// - images
+// - linear gradients, RGB or RGBA
+// - rounded gradients, RGB or RGBA
+// gdi:
+// - RGB
+// - hatches
+// - images
+// we can create a linear gradient image, but RGB only, and of finite size
+// core graphics:
+// - arbitrary patterns
+// - solid colors, arbitrary spaces
+// - shadows
+
+// arcs
+// cairo_arc/arc_negative
+// - parameters: center, radius, angle1 radians, angle2 radins
+// - if angle2 < angle1, TODO
+// - if angle2 > angle1, TODO
+// - line segment from current point to beginning of arc
+// - arc: clockwise, arc_negative: counterclockwise
+// - circular
+// GDI Arc/Pie
+// - parameters: bounding box, start point, end point
+// - current position not used/changed
+// - either clockwise or counterclockwise
+// - elliptical
+// GDI ArcTo
+// - same as Arc except line segment from current point to beginning of arc
+// - there does not appear to be a PieTo
+// GDI AngleArc
+// - parameters: center, radius, angle1 degrees, angle2 degrees
+// - line segment from current position to beginning of arc
+// - counterclockwise
+// - circular
+// - can be used to draw pies too; MSDN example demonstrates