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attributes.go
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attributes.go
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package path
import (
"fmt"
"strings"
"github.com/dustismo/heavyfishdesign/dynmap"
)
// defines the special points on a box
type PathAttr string
const (
// positions based on the bounding box of the drawn shape
// Note this will take whitespace into account
TopLeft PathAttr = "$TOP_LEFT"
TopRight PathAttr = "$TOP_RIGHT"
TopMiddle PathAttr = "$TOP_MIDDLE"
BottomLeft PathAttr = "$BOTTOM_LEFT"
BottomRight PathAttr = "$BOTTOM_RIGHT"
BottomMiddle PathAttr = "$BOTTOM_MIDDLE"
MiddleLeft PathAttr = "$MIDDLE_LEFT"
MiddleRight PathAttr = "$MIDDLE_RIGHT"
MiddleMiddle PathAttr = "$MIDDLE_MIDDLE"
// the first and last visible pixel
StartPoint PathAttr = "$START_POINT"
EndPoint PathAttr = "$END_POINT"
// current cursor location
Cursor PathAttr = "$CURSOR"
// the first point in the path, this
// differs from StartPoint because this could be
// a Move.
StartPosition PathAttr = "$START_POSITION"
EndPosition PathAttr = "$END_POSITION"
Width PathAttr = "$WIDTH"
Height PathAttr = "$HEIGHT"
Origin PathAttr = "$ORIGIN"
)
var enumAttr = map[string]PathAttr{
string(TopLeft): TopLeft,
string(TopRight): TopRight,
string(TopMiddle): TopMiddle,
string(BottomLeft): BottomLeft,
string(BottomRight): BottomRight,
string(BottomMiddle): BottomMiddle,
string(MiddleLeft): MiddleLeft,
string(MiddleRight): MiddleRight,
string(MiddleMiddle): MiddleMiddle,
string(StartPoint): StartPoint,
string(EndPoint): EndPoint,
string(StartPosition): StartPosition,
string(EndPosition): EndPosition,
string(Width): Width,
string(Height): Height,
string(Origin): Origin,
string(Cursor): Cursor,
}
func ToPathAttrFromPoint(point Point, precision int) PathAttr {
return PathAttr(fmt.Sprintf(precisionStr("%.3f,%.3f", precision), point.X, point.Y))
}
func ToPathAttr(str string) (PathAttr, error) {
if strings.Contains(str, ",") {
_, err := parsePoint(str)
return PathAttr(str), err
}
v, ok := enumAttr[str]
if !ok {
return TopLeft, fmt.Errorf("Error unknown path attr %s", str)
}
return v, nil
}
func PointPathAttribute(pos PathAttr, p Path, so SegmentOperators) (Point, error) {
v, err := PathAttribute(string(pos), p, so)
if err != nil {
return NewPoint(0, 0), err
}
switch pt := v.(type) {
case Point:
return pt, err
default:
return NewPoint(0, 0), fmt.Errorf("Error, type of %s is not a Point. it is %T", string(pos), v)
}
}
func parsePoint(attr string) (Point, error) {
commaPoint := strings.Split(attr, ",")
if len(commaPoint) == 2 {
// this is a X,Y handle
x, err := dynmap.ToFloat64(commaPoint[0])
if err != nil {
return NewPoint(0, 0), err
}
y, err := dynmap.ToFloat64(commaPoint[1])
if err != nil {
return NewPoint(0, 0), err
}
return NewPoint(x, y), nil
}
return NewPoint(0, 0), fmt.Errorf("%s is not parsable to a Point", attr)
}
func PathAttribute(attr string, p Path, so SegmentOperators) (interface{}, error) {
point, err := parsePoint(attr)
if err == nil {
return point, err
}
dots := strings.Split(attr, ".")
tl, br, err := BoundingBoxTrimWhitespace(p, so)
if err != nil {
return nil, err
}
middleX := tl.X + ((br.X - tl.X) / 2)
middleY := tl.Y + ((br.Y - tl.Y) / 2)
pnt := NewPoint(0, 0)
switch dots[0] {
case string(Origin):
return NewPoint(0, 0), nil
case string(Width):
return br.X - tl.X, nil
case string(Height):
return br.Y - tl.Y, nil
case string(StartPosition):
s := p.Segments()
if len(s) == 0 {
return p, fmt.Errorf("No available StartPosition on an empty path!")
}
return s[0].Start(), nil
case string(EndPosition):
s := p.Segments()
if len(s) == 0 {
return p, fmt.Errorf("no available endpos!")
}
return s[len(s)-1].End(), nil
case string(StartPoint):
s := TrimMove(p.Segments())
if len(s) == 0 {
return p, fmt.Errorf("no available startpoint!")
}
return s[0].Start(), nil
case string(EndPoint):
s := TrimMove(p.Segments())
if len(s) == 0 {
return p, fmt.Errorf("no available endpoint!")
}
return s[len(s)-1].End(), nil
case string(TopLeft):
pnt = tl
case string(TopRight):
pnt = NewPoint(br.X, tl.Y)
case string(TopMiddle):
pnt = NewPoint(middleX, tl.Y)
case string(BottomRight):
pnt = br
case string(BottomLeft):
pnt = NewPoint(tl.X, br.Y)
case string(BottomMiddle):
pnt = NewPoint(middleX, br.Y)
case string(MiddleMiddle):
pnt = NewPoint(middleX, middleY)
case string(MiddleLeft):
pnt = NewPoint(tl.X, middleY)
case string(MiddleRight):
pnt = NewPoint(br.X, middleY)
default:
return tl, fmt.Errorf("Error unknown field %s", dots[0])
}
// now look at the point, and see if we need to select the X or Y
if len(dots) > 1 {
switch dots[1] {
case "X":
return pnt.X, nil
case "Y":
return pnt.Y, nil
default:
return pnt, fmt.Errorf("Error unknown subfield %s", dots[1])
}
} else {
return pnt, nil
}
}