Mercurial > gemma

annotate pkg/misc/encode.go @ 942:912d016275ee

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client: add arrow to drawn linesegment * Add styling function that will place an icon png image at the end of each drawn line segment, in the right rotation. Note that this does not look perfectly centered, see comment in the code.
author Bernhard Reiter <bernhard@intevation.de>
date Tue, 09 Oct 2018 18:39:01 +0200
parents f827dc4f3e95
children a244b18cb916
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package misc
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2
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3 import (
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4 "encoding/binary"
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5 "io"
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6 )
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7
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8 type BinReader struct {
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9 io.Reader
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10 Err error
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11 }
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13 func (r *BinReader) Read(buf []byte) (int, error) {
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14 if r.Err != nil {
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15 return 0, r.Err
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16 }
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17 var n int
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18 n, r.Err = r.Read(buf)
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19 return n, r.Err
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20 }
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22 func (r *BinReader) ReadBin(x interface{}) {
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23 if r.Err == nil {
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24 r.Err = binary.Read(r.Reader, binary.BigEndian, x)
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25 }
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26 }
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28 func (r *BinReader) ReadString(s *string) {
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29 if r.Err != nil {
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30 return
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31 }
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32 var l uint32
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33 if r.Err = binary.Read(r.Reader, binary.BigEndian, &l); r.Err != nil {
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34 return
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35 }
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36 b := make([]byte, l)
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37 if r.Err = binary.Read(r.Reader, binary.BigEndian, b); r.Err != nil {
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38 return
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39 }
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40 *s = string(b)
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41 }
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43 type BinWriter struct {
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44 io.Writer
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45 Err error
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46 }
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47
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48 func (w *BinWriter) Write(buf []byte) (int, error) {
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49 if w.Err != nil {
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50 return 0, w.Err
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51 }
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52 var n int
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53 n, w.Err = w.Writer.Write(buf)
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54 return n, w.Err
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55 }
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57 func (w *BinWriter) WriteBin(x interface{}) {
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58 if w.Err == nil {
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59 w.Err = binary.Write(w.Writer, binary.BigEndian, x)
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60 }
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61 }
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63 func (w *BinWriter) WriteString(s string) {
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64 if w.Err == nil {
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65 w.Err = binary.Write(w.Writer, binary.BigEndian, uint32(len(s)))
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66 }
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67 if w.Err == nil {
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68 w.Err = binary.Write(w.Writer, binary.BigEndian, []byte(s))
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69 }
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70 }