Merge pull request #6121 from pokgopun/pwc165

pwc165 solution

2 files changed, 173 insertions, 0 deletions

diff --git a/challenge-165/pokgopun/go/ch-1.go b/challenge-165/pokgopun/go/ch-1.go
new file mode 100644
index 0000000000..cace8187e2
--- /dev/null
+++ b/challenge-165/pokgopun/go/ch-1.go
@@ -0,0 +1,107 @@
+/*
+### Interactively enter points and lines and output to STDOUT:
+
+go run ch-1.go
+
+Enter 'x1,y1' for a point or 'x1,y1,x2,y2' for a line, or '0' to end this
+53,10
+53,10,23,30
+23,30
+0
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="60.000000" width="106.000000" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+	<g id="lines" stroke="#369" stroke-width="4"><line x1="53.000000" x2="23.000000" y1="10.000000" y2="30.000000" /></g><g fill="#f73" id="points"><circle cx="53.000000" cy="10.000000" r="3" /><circle cx="23.000000" cy="30.000000" r="3" /></g></svg>
+
+### Pass points and line data via STDIN and output to file ch-1.svg:
+
+echo -e "53,10\n53,10,23,30\n23,30\n0" | go run ch-1.go ch-1.svg
+*/
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+type point struct{ x, y float64 }
+type line struct {
+	start point
+	end   point
+}
+
+type Svg struct {
+	points        []point
+	lines         []line
+	height, width float64
+}
+
+func (svg *Svg) updateHW() {
+	var points []point
+	for _, l := range svg.lines {
+		points = append(points, l.start, l.end)
+	}
+	for _, p := range append(points, svg.points...) {
+		if p.x > svg.width {
+			svg.width = p.x
+		}
+		if p.y > svg.height {
+			svg.height = p.y
+		}
+	}
+}
+
+func (svg *Svg) input() {
+	var x1, y1, x2, y2 float64
+	guide := "Enter 'x1,y1' for a point or 'x1,y1,x2,y2' for a line, or '0' to end this"
+	//fmt.Println(guide)
+	for {
+		n, err := fmt.Scanf("%f,%f,%f,%f\n", &x1, &y1, &x2, &y2)
+		//fmt.Println("n =>", n, "err =>", err)
+		switch n {
+		case 2:
+			svg.points = append(svg.points, point{x1, y1})
+		case 4:
+			svg.lines = append(svg.lines, line{point{x1, y1}, point{x2, y2}})
+		default:
+			if err == io.EOF || n == 1 && x1 == 0 {
+				goto done
+			}
+			fmt.Fprintln(os.Stderr, guide)
+			continue
+		}
+		//fmt.Println("svg =>", svg)
+	}
+done:
+}
+func main() {
+	w := bufio.NewWriter(os.Stdout)
+	if len(os.Args) > 1 {
+		f, err := os.Create(os.Args[1])
+		if err != nil {
+			log.Fatal(err)
+		}
+		defer f.Close()
+		w = bufio.NewWriter(f)
+	}
+	var data Svg
+	data.input()
+	data.updateHW()
+	//fmt.Println(data.height, data.width)
+	fmt.Fprintf(w, `<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg height="%f" width="%f" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+	<g id="lines" stroke="#369" stroke-width="4">`, data.height*2, data.width*2)
+	for _, l := range data.lines {
+		fmt.Fprintf(w, `<line x1="%f" x2="%f" y1="%f" y2="%f" />`, l.start.x, l.end.x, l.start.y, l.end.y)
+	}
+	w.WriteString(`</g><g fill="#f73" id="points">`)
+	for _, p := range data.points {
+		fmt.Fprintf(w, `<circle cx="%f" cy="%f" r="3" />`, p.x, p.y)
+	}
+	w.WriteString(`</g></svg>`)
+	w.Flush()
+}
diff --git a/challenge-165/pokgopun/go/ch-2.go b/challenge-165/pokgopun/go/ch-2.go
new file mode 100644
index 0000000000..a3d0d9c451
--- /dev/null
+++ b/challenge-165/pokgopun/go/ch-2.go
@@ -0,0 +1,66 @@
+/*
+### To pipe output to ch1.go to create svg file
+
+go run ch-2.go | go run ch-1.go ch-2.svg
+
+*/
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+)
+
+func main() {
+	//rawin := `2,4 3,5 5,7 7,10 9,15`
+	/**/
+	rawin := `333,129  39,189 140,156 292,134 393,52  160,166 362,122  13,193
+			341,104 320,113 109,177 203,152 343,100 225,110  23,186 282,102
+			284,98  205,133 297,114 292,126 339,112 327,79  253,136  61,169
+			128,176 346,72  316,103 124,162  65,181 159,137 212,116 337,86
+			215,136 153,137 390,104 100,180  76,188  77,181  69,195  92,186
+			275,96  250,147  34,174 213,134 186,129 189,154 361,82  363,89`
+	/**/
+	var ds struct{ count, x, y, sumx, sumy, sumxx, sumxy, m, b, x1, x2, y1, y2 float64 }
+	_, err := fmt.Sscanf(rawin, "%f,%f %f,%f", &ds.x1, &ds.y1, &ds.x2, &ds.y2)
+	if err != nil {
+		log.Fatal(err)
+	}
+	w := bufio.NewWriter(os.Stdout)
+	for _, v := range regexp.MustCompile(`\d+,\d+`).FindAllString(rawin, -1) {
+		_, err := fmt.Sscanf(v, "%f,%f", &ds.x, &ds.y)
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Fprintln(w, v)
+		ds.count++
+		ds.sumx += ds.x
+		ds.sumy += ds.y
+		ds.sumxx += ds.x * ds.x
+		ds.sumxy += ds.x * ds.y
+		if ds.x1 > ds.x {
+			ds.x1 = ds.x
+		}
+		if ds.x2 < ds.x {
+			ds.x2 = ds.x
+		}
+		/*
+			if ds.y1 > ds.y {
+				ds.y1 = ds.y
+			}
+			if ds.y2 < ds.y {
+				ds.y2 = ds.y
+			}
+		*/
+	}
+	ds.m = (ds.count*ds.sumxy - ds.sumx*ds.sumy) / (ds.count*ds.sumxx - ds.sumx*ds.sumx)
+	ds.b = (ds.sumy - ds.m*ds.sumx) / ds.count
+	ds.y1 = ds.m*ds.x1 + ds.b
+	ds.y2 = ds.m*ds.x2 + ds.b
+	fmt.Fprintf(w, "%f,%f,%f,%f\n", ds.x1, ds.y1, ds.x2, ds.y2)
+	w.Flush()
+	//fmt.Printf("%+v\n", ds)
+}