finished with image exercise
This commit is contained in:
parent
9536908ab8
commit
914dca955d
68
ch1/lissajous/1_5.go
Normal file
68
ch1/lissajous/1_5.go
Normal file
@ -0,0 +1,68 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"image"
|
||||
"image/color"
|
||||
"image/gif"
|
||||
"io"
|
||||
"math"
|
||||
"math/rand"
|
||||
"os"
|
||||
)
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net/http"
|
||||
"time"
|
||||
)
|
||||
|
||||
var palette = []color.Color{
|
||||
color.Black,
|
||||
color.RGBA{0x00, 0xff, 0x00, 0xff},
|
||||
}
|
||||
|
||||
const (
|
||||
whiteIndex = 0 // first color in palette
|
||||
blackIndex = 1 // next color in palette
|
||||
)
|
||||
|
||||
func main() {
|
||||
rand.Seed(time.Now().UTC().UnixNano())
|
||||
|
||||
if len(os.Args) > 1 && os.Args[1] == "web" {
|
||||
handler := func(w http.ResponseWriter, r *http.Request) {
|
||||
lissajous(w)
|
||||
}
|
||||
http.HandleFunc("/", handler)
|
||||
log.Fatal(http.ListenAndServe("localhost:8000", nil))
|
||||
return
|
||||
}
|
||||
lissajous(os.Stdout)
|
||||
}
|
||||
|
||||
func lissajous(out io.Writer) {
|
||||
const (
|
||||
cycles = 5 // number of complete x oscillator revolutions
|
||||
res = 0.001 // angular resolution
|
||||
size = 100 // image canvas covers [-size..+size]
|
||||
nframes = 64 // number of animation frames
|
||||
delay = 8 // delay between frames in 10ms units
|
||||
)
|
||||
freq := rand.Float64() * 3.0 // relative frequency of y oscillator
|
||||
anim := gif.GIF{LoopCount: nframes}
|
||||
phase := 0.0 // phase difference
|
||||
for i := 0; i < nframes; i++ {
|
||||
rect := image.Rect(0, 0, 2*size+1, 2*size+1)
|
||||
img := image.NewPaletted(rect, palette)
|
||||
for t := 0.0; t < cycles*2*math.Pi; t += res {
|
||||
x := math.Sin(t)
|
||||
y := math.Sin(t*freq + phase)
|
||||
img.SetColorIndex(size+int(x*size+0.5), size+int(y*size+0.5),
|
||||
blackIndex)
|
||||
}
|
||||
phase += 0.1
|
||||
anim.Delay = append(anim.Delay, delay)
|
||||
anim.Image = append(anim.Image, img)
|
||||
}
|
||||
gif.EncodeAll(out, &anim) // NOTE: ignoring encoding errors
|
||||
}
|
||||
65
ch1/lissajous/1_6.go
Normal file
65
ch1/lissajous/1_6.go
Normal file
@ -0,0 +1,65 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"image"
|
||||
"image/color"
|
||||
"image/gif"
|
||||
"io"
|
||||
"math"
|
||||
"math/rand"
|
||||
"os"
|
||||
)
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net/http"
|
||||
"time"
|
||||
)
|
||||
|
||||
var palette = []color.Color{
|
||||
color.Black,
|
||||
color.RGBA{0xff, 0x00, 0x00, 0xff},
|
||||
color.RGBA{0x00, 0xff, 0x00, 0xff},
|
||||
color.RGBA{0x00, 0x00, 0xff, 0xff},
|
||||
}
|
||||
|
||||
func main() {
|
||||
rand.Seed(time.Now().UTC().UnixNano())
|
||||
|
||||
if len(os.Args) > 1 && os.Args[1] == "web" {
|
||||
handler := func(w http.ResponseWriter, r *http.Request) {
|
||||
lissajous(w)
|
||||
}
|
||||
http.HandleFunc("/", handler)
|
||||
log.Fatal(http.ListenAndServe("localhost:8000", nil))
|
||||
return
|
||||
}
|
||||
lissajous(os.Stdout)
|
||||
}
|
||||
|
||||
func lissajous(out io.Writer) {
|
||||
const (
|
||||
cycles = 5 // number of complete x oscillator revolutions
|
||||
res = 0.001 // angular resolution
|
||||
size = 100 // image canvas covers [-size..+size]
|
||||
nframes = 64 // number of animation frames
|
||||
delay = 8 // delay between frames in 10ms units
|
||||
)
|
||||
freq := rand.Float64() * 3.0 // relative frequency of y oscillator
|
||||
anim := gif.GIF{LoopCount: nframes}
|
||||
phase := 0.0 // phase difference
|
||||
for i := 0; i < nframes; i++ {
|
||||
rect := image.Rect(0, 0, 2*size+1, 2*size+1)
|
||||
img := image.NewPaletted(rect, palette)
|
||||
for t := 0.0; t < cycles*2*math.Pi; t += res {
|
||||
x := math.Sin(t)
|
||||
y := math.Sin(t*freq + phase)
|
||||
img.SetColorIndex(size+int(x*size+0.5), size+int(y*size+0.5),
|
||||
uint8(rand.Intn(3)))
|
||||
}
|
||||
phase += 0.1
|
||||
anim.Delay = append(anim.Delay, delay)
|
||||
anim.Image = append(anim.Image, img)
|
||||
}
|
||||
gif.EncodeAll(out, &anim) // NOTE: ignoring encoding errors
|
||||
}
|
||||
68
ch1/lissajous/lissajous.go
Normal file
68
ch1/lissajous/lissajous.go
Normal file
@ -0,0 +1,68 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"image"
|
||||
"image/color"
|
||||
"image/gif"
|
||||
"io"
|
||||
"math"
|
||||
"math/rand"
|
||||
"os"
|
||||
)
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net/http"
|
||||
"time"
|
||||
)
|
||||
|
||||
var palette = []color.Color{
|
||||
color.Black,
|
||||
color.RGBA{0x00, 0xff, 0x00, 0xff},
|
||||
}
|
||||
|
||||
const (
|
||||
whiteIndex = 0 // first color in palette
|
||||
blackIndex = 1 // next color in palette
|
||||
)
|
||||
|
||||
func main() {
|
||||
rand.Seed(time.Now().UTC().UnixNano())
|
||||
|
||||
if len(os.Args) > 1 && os.Args[1] == "web" {
|
||||
handler := func(w http.ResponseWriter, r *http.Request) {
|
||||
lissajous(w)
|
||||
}
|
||||
http.HandleFunc("/", handler)
|
||||
log.Fatal(http.ListenAndServe("localhost:8000", nil))
|
||||
return
|
||||
}
|
||||
lissajous(os.Stdout)
|
||||
}
|
||||
|
||||
func lissajous(out io.Writer) {
|
||||
const (
|
||||
cycles = 5 // number of complete x oscillator revolutions
|
||||
res = 0.001 // angular resolution
|
||||
size = 100 // image canvas covers [-size..+size]
|
||||
nframes = 64 // number of animation frames
|
||||
delay = 8 // delay between frames in 10ms units
|
||||
)
|
||||
freq := rand.Float64() * 3.0 // relative frequency of y oscillator
|
||||
anim := gif.GIF{LoopCount: nframes}
|
||||
phase := 0.0 // phase difference
|
||||
for i := 0; i < nframes; i++ {
|
||||
rect := image.Rect(0, 0, 2*size+1, 2*size+1)
|
||||
img := image.NewPaletted(rect, palette)
|
||||
for t := 0.0; t < cycles*2*math.Pi; t += res {
|
||||
x := math.Sin(t)
|
||||
y := math.Sin(t*freq + phase)
|
||||
img.SetColorIndex(size+int(x*size+0.5), size+int(y*size+0.5),
|
||||
blackIndex)
|
||||
}
|
||||
phase += 0.1
|
||||
anim.Delay = append(anim.Delay, delay)
|
||||
anim.Image = append(anim.Image, img)
|
||||
}
|
||||
gif.EncodeAll(out, &anim) // NOTE: ignoring encoding errors
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user