/
resizehandles.go
159 lines (127 loc) · 4.38 KB
/
resizehandles.go
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package gohotdraw
import (
"math"
)
func AddCornerHandles(f Figure, handles *Set) {
handles.Push(newSouthEastHandle(f))
handles.Push(newSouthWestHandle(f))
handles.Push(newNorthEastHandle(f))
handles.Push(newNorthWestHandle(f))
}
func AddAllHandles(f Figure, handles *Set) {
AddCornerHandles(f, handles)
handles.Push(newSouthHandle(f))
handles.Push(newEastHandle(f))
handles.Push(newNorthHandle(f))
handles.Push(newWestHandle(f))
}
type resizeHandle struct {
*LocatorHandle
}
func newResizeHandle(owner Figure, loc Locator) *resizeHandle {
handle := &resizeHandle{}
handle.LocatorHandle = NewLocatorHandle(owner, loc)
return handle
}
func InvokeStart(x, y int, view DrawingView) {
//TODO
}
func InvokeEnd(x, y int, view DrawingView) {
//TODO
}
type northEastHandle struct {
*resizeHandle
}
func newNorthEastHandle(owner Figure) *northEastHandle {
return &northEastHandle{newResizeHandle(owner, CreateNorthEastLocator())}
}
func (this *northEastHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
this.owner.SetDisplayBox(
this.owner,
&Point{r.X, int(math.Fmin(float64(r.Y+r.Height), float64(y)))},
&Point{int(math.Fmax(float64(r.X), float64(x))), r.Y + r.Height})
}
type eastHandle struct {
*resizeHandle
}
func newEastHandle(owner Figure) *eastHandle {
return &eastHandle{newResizeHandle(owner, CreateEastLocator())}
}
func (this *eastHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
this.owner.SetDisplayBox(
this.owner,
&Point{r.X, r.Y},
&Point{int(math.Fmax(float64(r.X), float64(x))), r.Y + r.Height})
}
type northHandle struct {
*resizeHandle
}
func newNorthHandle(owner Figure) *northHandle {
return &northHandle{newResizeHandle(owner, CreateNorthLocator())}
}
func (this *northHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
topLeft := &Point{r.X, int(math.Fmin(float64(r.Y+r.Height), float64(y)))}
bottomRight := &Point{r.X + r.Width, r.Y + r.Height}
this.owner.SetDisplayBox(this.owner, topLeft, bottomRight)
}
type northWestHandle struct {
*resizeHandle
}
func newNorthWestHandle(owner Figure) *northWestHandle {
return &northWestHandle{newResizeHandle(owner, CreateNorthWestLocator())}
}
func (this *northWestHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
topLeft := &Point{int(math.Fmin(float64(r.X+r.Width), float64(x))), int(math.Fmin(float64(r.Y+r.Height), float64(y)))}
bottomRight := &Point{r.X + r.Width, r.Y + r.Height}
this.owner.SetDisplayBox(this.owner, topLeft, bottomRight)
}
type southEastHandle struct {
*resizeHandle
}
func newSouthEastHandle(owner Figure) *southEastHandle {
return &southEastHandle{newResizeHandle(owner, CreateSouthEastLocator())}
}
func (this *southEastHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
this.owner.SetDisplayBox(this.owner, &Point{r.X, r.Y},
&Point{int(math.Fmax(float64(r.X), float64(x))), int(math.Fmax(float64(r.Y), float64(y)))})
}
type southHandle struct {
*resizeHandle
}
func newSouthHandle(owner Figure) *southHandle {
return &southHandle{newResizeHandle(owner, CreateSouthLocator())}
}
func (this *southHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
this.owner.SetDisplayBox(this.owner, &Point{r.X, r.Y},
&Point{r.X + r.Width, int(math.Fmax(float64(r.Y), float64(y)))})
}
type southWestHandle struct {
*resizeHandle
}
func newSouthWestHandle(owner Figure) *southWestHandle {
return &southWestHandle{newResizeHandle(owner, CreateSouthWestLocator())}
}
func (this *southWestHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
topLeft := &Point{int(math.Fmin(float64(r.X+r.Width), float64(x))), r.Y}
bottomRight := &Point{r.X + r.Width, int(math.Fmax(float64(r.Y), float64(y)))}
this.owner.SetDisplayBox(this.owner, topLeft, bottomRight)
}
type westHandle struct {
*resizeHandle
}
func newWestHandle(owner Figure) *westHandle {
return &westHandle{newResizeHandle(owner, CreateWestLocator())}
}
func (this *westHandle) InvokeStep(x, y, anchorX, anchorY int, view DrawingView) {
r := this.owner.GetDisplayBox()
this.owner.SetDisplayBox(this.owner,
&Point{int(math.Fmin(float64(r.X+r.Width), float64(x))), r.Y},
&Point{r.X + r.Width, r.Y + r.Height})
}