37 lines
668 B
Go
37 lines
668 B
Go
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package bridge
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import "fmt"
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import "errors"
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// Bridge interface
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type Drawer interface {
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DrawRectangle(w, h int)
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}
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type GreenRectangleDrawer struct {}
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func (d GreenRectangleDrawer) DrawRectangle(w, h int) {
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fmt.Printf("Green rectangle W: %d, H: %d", w, h)
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}
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type RedRectangleDrawer struct {}
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func (d RedRectangleDrawer) DrawRectangle(w, h int) {
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fmt.Printf("Red rectangle W: %d, H: %d", w, h)
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}
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type Shape interface {
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Draw() error
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}
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type Rectangle struct {
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Width, Height int
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drawer Drawer
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}
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func (d Rectangle) Draw () error {
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if d.drawer == nil {
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return errors.New("Drawer not initialized.")
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}
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d.drawer.DrawRectangle(d.Width, d.Height)
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return nil
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}
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