draw2d/draw2dbase/curve_test.go at master · llgcode/draw2d · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
package draw2dbase

import (
	"bufio"
	"fmt"
	"image"
	"image/color"
	"image/draw"
	"image/png"
	"log"
	"os"
	"testing"
)

var (
	flatteningThreshold = 0.5
	testsCubicFloat64   = []float64{
		100, 100, 200, 100, 100, 200, 200, 200,
		100, 100, 300, 200, 200, 200, 300, 100,
		100, 100, 0, 300, 200, 0, 300, 300,
		150, 290, 10, 10, 290, 10, 150, 290,
		10, 290, 10, 10, 290, 10, 290, 290,
		100, 290, 290, 10, 10, 10, 200, 290,
	}
	testsQuadFloat64 = []float64{
		100, 100, 200, 100, 200, 200,
		100, 100, 290, 200, 290, 100,
		100, 100, 0, 290, 200, 290,
		150, 290, 10, 10, 290, 290,
		10, 290, 10, 10, 290, 290,
		100, 290, 290, 10, 120, 290,
	}
)

func init() {
	os.Mkdir("test_results", 0666)
	f, err := os.Create("../output/curve/_test.html")
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	defer f.Close()
	log.Printf("Create html viewer")
	f.Write([]byte("<html><body>"))
	for i := 0; i < len(testsCubicFloat64)/8; i++ {
		f.Write([]byte(fmt.Sprintf("<div><img src='_test%d.png'/></div>\n", i)))
	}
	for i := 0; i < len(testsQuadFloat64); i++ {
		f.Write([]byte(fmt.Sprintf("<div><img src='_testQuad%d.png'/>\n</div>\n", i)))
	}
	f.Write([]byte("</body></html>"))

}

func drawPoints(img draw.Image, c color.Color, s ...float64) image.Image {
	for i := 0; i < len(s); i += 2 {
		x, y := int(s[i]+0.5), int(s[i+1]+0.5)
		img.Set(x, y, c)
		img.Set(x, y+1, c)
		img.Set(x, y-1, c)
		img.Set(x+1, y, c)
		img.Set(x+1, y+1, c)
		img.Set(x+1, y-1, c)
		img.Set(x-1, y, c)
		img.Set(x-1, y+1, c)
		img.Set(x-1, y-1, c)

	}
	return img
}

func TestCubicCurve(t *testing.T) {
	for i := 0; i < len(testsCubicFloat64); i += 8 {
		var p SegmentedPath
		p.MoveTo(testsCubicFloat64[i], testsCubicFloat64[i+1])
		TraceCubic(&p, testsCubicFloat64[i:], flatteningThreshold)
		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
		PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, testsCubicFloat64[i:i+8]...)
		PolylineBresenham(img, image.Black, p.Points...)
		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.Points...)
		SaveToPngFile(fmt.Sprintf("../output/curve/_test%d.png", i/8), img)
		log.Printf("Num of points: %d\n", len(p.Points))
	}
	fmt.Println()
}

func TestQuadCurve(t *testing.T) {
	for i := 0; i < len(testsQuadFloat64); i += 6 {
		var p SegmentedPath
		p.MoveTo(testsQuadFloat64[i], testsQuadFloat64[i+1])
		TraceQuad(&p, testsQuadFloat64[i:], flatteningThreshold)
		img := image.NewNRGBA(image.Rect(0, 0, 300, 300))
		PolylineBresenham(img, color.NRGBA{0xff, 0, 0, 0xff}, testsQuadFloat64[i:i+6]...)
		PolylineBresenham(img, image.Black, p.Points...)
		//drawPoints(img, image.NRGBAColor{0, 0, 0, 0xff}, curve[:]...)
		drawPoints(img, color.NRGBA{0, 0, 0, 0xff}, p.Points...)
		SaveToPngFile(fmt.Sprintf("../output/curve/_testQuad%d.png", i), img)
		log.Printf("Num of points: %d\n", len(p.Points))
	}
	fmt.Println()
}

func TestQuadCurveCombinedPoint(t *testing.T) {
	var p1 SegmentedPath
	TraceQuad(&p1, []float64{0, 0, 0, 0, 0, 0}, flatteningThreshold)
	if len(p1.Points) != 2 {
		t.Error("It must have one point for this curve", len(p1.Points))
	}
	var p2 SegmentedPath
	TraceQuad(&p2, []float64{0, 0, 100, 100, 0, 0}, flatteningThreshold)
	if len(p2.Points) != 2 {
		t.Error("It must have one point for this curve", len(p2.Points))
	}
}

func TestCubicCurveCombinedPoint(t *testing.T) {
	var p1 SegmentedPath
	TraceCubic(&p1, []float64{0, 0, 0, 0, 0, 0, 0, 0}, flatteningThreshold)
	if len(p1.Points) != 2 {
		t.Error("It must have one point for this curve", len(p1.Points))
	}
	var p2 SegmentedPath
	TraceCubic(&p2, []float64{0, 0, 100, 100, 200, 200, 0, 0}, flatteningThreshold)
	if len(p2.Points) != 2 {
		t.Error("It must have one point for this curve", len(p2.Points))
	}
}

func BenchmarkCubicCurve(b *testing.B) {
	for i := 0; i < b.N; i++ {
		for i := 0; i < len(testsCubicFloat64); i += 8 {
			var p SegmentedPath
			p.MoveTo(testsCubicFloat64[i], testsCubicFloat64[i+1])
			TraceCubic(&p, testsCubicFloat64[i:], flatteningThreshold)
		}
	}
}

// SaveToPngFile create and save an image to a file using PNG format
func SaveToPngFile(filePath string, m image.Image) error {
	// Create the file
	f, err := os.Create(filePath)
	if err != nil {
		return err
	}
	defer f.Close()
	// Create Writer from file
	b := bufio.NewWriter(f)
	// Write the image into the buffer
	err = png.Encode(b, m)
	if err != nil {
		return err
	}
	err = b.Flush()
	if err != nil {
		return err
	}
	return nil
}

func TestOutOfRangeTraceCurve(t *testing.T) {
	c := []float64{
		100, 100, 200, 100, 100, 200,
	}
	var p SegmentedPath
	TraceCubic(&p, c, flatteningThreshold)
}

func TestOutOfRangeTraceQuad(t *testing.T) {
	c := []float64{
		100, 100, 200, 100,
	}
	var p SegmentedPath
	TraceQuad(&p, c, flatteningThreshold)
}