Added missing bindings for matrix

- .TransformPoint(...) has been proven to work on mac
- .TransformSize(...) should therefore work as well as it's basically the same
- vs code also ran go fmt so there's that

draw.go

@@ -44,6 +44,7 @@ type DrawPath struct {
 //
 // TODO disclaimer
 type DrawFillMode uint
+
 const (
 	DrawFillModeWinding DrawFillMode = iota
 	DrawFillModeAlternate
@@ -161,6 +162,7 @@ type DrawContext struct {
 //
 // TODO disclaimer
 type DrawBrushType int
+
 const (
 	DrawBrushTypeSolid DrawBrushType = iota
 	DrawBrushTypeLinearGradient
@@ -173,6 +175,7 @@ const (
 // TODO disclaimer
 // TODO rename these to put LineCap at the beginning? or just Cap?
 type DrawLineCap int
+
 const (
 	DrawLineCapFlat DrawLineCap = iota
 	DrawLineCapRound
@@ -183,6 +186,7 @@ const (
 //
 // TODO disclaimer
 type DrawLineJoin int
+
 const (
 	DrawLineJoinMiter DrawLineJoin = iota
 	DrawLineJoinRound
@@ -421,14 +425,24 @@ func (m *DrawMatrix) Invert() bool {
 	return tobool(res)
 }
 
-// TODO unimplemented
+// TODO
+//
+// Transforms a point by this matrix
 func (m *DrawMatrix) TransformPoint(x float64, y float64) (xout float64, yout float64) {
-	panic("TODO")
+	cm := m.toLibui()
+	cx, cy := C.double(x), C.double(y)
+	C.uiDrawMatrixTransformPoint(cm, &cx, &cy)
+	C.pkguiFreeMatrix(cm)
+	return float64(cx), float64(cy)
 }
 
-// TODO unimplemented
+// TODO
 func (m *DrawMatrix) TransformSize(x float64, y float64) (xout float64, yout float64) {
-	panic("TODO")
+	cm := m.toLibui()
+	cx, cy := C.double(x), C.double(y)
+	C.uiDrawMatrixTransformSize(cm, &cx, &cy)
+	C.pkguiFreeMatrix(cm)
+	return float64(cx), float64(cy)
 }
 
 // TODO