go-chart/drawing/transformer.go
2016-07-08 17:57:14 -07:00

40 lines
944 B
Go

// Copyright 2010 The draw2d Authors. All rights reserved.
// created: 13/12/2010 by Laurent Le Goff
package drawing
// Transformer apply the Matrix transformation tr
type Transformer struct {
Tr Matrix
Flattener Flattener
}
// MoveTo implements the path builder interface.
func (t Transformer) MoveTo(x, y float64) {
u := x*t.Tr[0] + y*t.Tr[2] + t.Tr[4]
v := x*t.Tr[1] + y*t.Tr[3] + t.Tr[5]
t.Flattener.MoveTo(u, v)
}
// LineTo implements the path builder interface.
func (t Transformer) LineTo(x, y float64) {
u := x*t.Tr[0] + y*t.Tr[2] + t.Tr[4]
v := x*t.Tr[1] + y*t.Tr[3] + t.Tr[5]
t.Flattener.LineTo(u, v)
}
// LineJoin implements the path builder interface.
func (t Transformer) LineJoin() {
t.Flattener.LineJoin()
}
// Close implements the path builder interface.
func (t Transformer) Close() {
t.Flattener.Close()
}
// End implements the path builder interface.
func (t Transformer) End() {
t.Flattener.End()
}