byjp.me
A tool for archiving & converting scans of postcards, and information about them.
1package types
2
3import (
4 "fmt"
5)
6
7type SecretType struct {
8 Type string `json:"type" yaml:"type"`
9}
10
11type SecretPolygon struct {
12 Type string `json:"type" yaml:"type"`
13 Prehidden bool `json:"prehidden" yaml:"prehidden"`
14 Points []Point `json:"points" yaml:"points"`
15}
16
17type SecretBox struct {
18 Type string `json:"type" yaml:"type"`
19 Prehidden bool `json:"prehidden" yaml:"prehidden"`
20 Width float64 `json:"width" yaml:"width"`
21 Height float64 `json:"height" yaml:"height"`
22 Left float64 `json:"left" yaml:"left"`
23 Top float64 `json:"top" yaml:"top"`
24}
25
26// Allows polygons with type: box *and* type: polygon to be unmarshalled
27func (poly *Polygon) multiPolygonUnmarshaller(decode func(interface{}) error) error {
28 var typer SecretType
29 if err := decode(&typer); err != nil {
30 return fmt.Errorf("invalid secret definition")
31 }
32
33 switch typer.Type {
34 case "box":
35 var box SecretBox
36 if err := decode(&box); err != nil {
37 return fmt.Errorf("invalid box secret definition")
38 }
39
40 return box.intoPolygon(poly)
41 case "polygon":
42 var polygon SecretPolygon
43 if err := decode(&polygon); err != nil {
44 return fmt.Errorf("invalid polygon secret definition")
45 }
46
47 poly.Prehidden = polygon.Prehidden
48 poly.Points = polygon.Points
49
50 return nil
51 default:
52 return fmt.Errorf("unknown secret type: %s", typer.Type)
53 }
54}
55
56func (box SecretBox) intoPolygon(poly *Polygon) error {
57 poly.Prehidden = box.Prehidden
58
59 if outOfBounds(box.Width) {
60 return fmt.Errorf("width of box secret is larger than 100%% of the postcard")
61 }
62 if outOfBounds(box.Height) {
63 return fmt.Errorf("height of box secret is larger than 100%% of the postcard")
64 }
65 if outOfBounds(box.Left) {
66 return fmt.Errorf("left edge of box secret is outside the postcard")
67 }
68 if outOfBounds(box.Top) {
69 return fmt.Errorf("top edge of box secret is outside the postcard")
70 }
71
72 bottom := box.Top + box.Height
73 if outOfBounds(bottom) {
74 return fmt.Errorf("bottom edge of box secret is outside the postcard")
75 }
76 right := box.Left + box.Width
77 if outOfBounds(right) {
78 return fmt.Errorf("right edge of box secret is outside the postcard")
79 }
80
81 poly.Points = []Point{
82 {X: box.Left, Y: box.Top},
83 {X: right, Y: box.Top},
84 {X: right, Y: bottom},
85 {X: box.Left, Y: bottom},
86 }
87
88 return nil
89}
90
91func outOfBounds(d float64) bool {
92 return d < 0.0 || d > 1.0
93}