tommy351

在 Facebook 上分享 Dcard 文章時，如果沒有指定圖片的話，可能會看到如下的文章摘要：

這張圖片是透過 Go library draw2d 產生的，它有類似 HTML5 canvas 的 API，所以畫一些簡單的圖形都還算小菜一碟，然而在處理文字上就沒這麼得心應手了。

初次嘗試

src, _ := loadBaseImageForPost(post)

tommy351

func drawLine(gc *draw2dimg.GraphicContext, str string, maxX float64, maxY float64, x float64, y float64) (bool, float64) {
	// Handle empty line
	if len(strings.TrimSpace(str)) == 0 {
		return false, y + gc.Current.FontSize*lineHeight
	}

	list := []rune(str)
	length := len(list)
	offsetX := x
	offsetY := y

tommy351

func drawLine(gc *draw2dimg.GraphicContext, str string, maxX float64, maxY float64, x float64, y float64) (bool, float64) {
	// Handle empty line
	if len(strings.TrimSpace(str)) == 0 {
		return false, y + gc.Current.FontSize*lineHeight
	}

	list := []rune(str)
	length := len(list)
	offsetX := x
	offsetY := y

tommy351

func drawLine(gc *draw2dimg.GraphicContext, str string, x float64, y float64) {
	gc.FillStringAt(str, x, y)
}

func drawText(gc *draw2dimg.GraphicContext, str string, width float64, height float64, x float64, y float64) {
	str = strings.Trim(str, " \n\r\t")
	lines := strings.Split(str, "\n")
	fontSize := gc.Current.FontSize
	offsetY := y
	wrapLines := []string{}

tommy351

draw2d.SetFontFolder("static/fonts")
draw2d.SetFontNamer(func(fontData draw2d.FontData) string {
	return "WenQuanYiMicroHei.ttf"
})

tommy351

2016/11/04 16:06:16 open ../resource/font/luxisr.ttf: no such file or directory
2016/11/04 16:06:16 open ../resource/font/luxisr.ttf: no such file or directory
2016/11/04 16:06:16 No font set, and no default font available.

tommy351

src, _ := loadBaseImageForPost(post)
img := image.NewRGBA(src.Bounds())
gc := draw2dimg.NewGraphicContext(img)

gc.DrawImage(src)

// Draw title
gc.SetFillColor(color.RGBA{0xff, 0xff, 0xff, 0xff})
gc.SetFontSize(26)
gc.FillStringAt(post.Title, 140, 81.5)

tommy351

'use strict';

var highlight = require('highlight.js');
var Highlights = require('highlights');
var highlighter = new Highlights();
var util = require('../lib');
var fs = require('fs');
var pathFn = require('path');
var fixture = fs.readFileSync(pathFn.join(__dirname, 'fixtures', 'q3.js'), 'utf8');

tommy351

var input = '';

process.stdin.resume();
process.stdin.setEncoding('utf8');

process.stdin.on('data', function(chunk) {
    input += chunk;
});

process.stdin.on('end', function() {

tommy351

import exp.*;
import flowd.*;

class P99 extends FunNode {
  P99(){
    super("P99");
    Var i = addVar("i");
    Var j = addVar("j");
    
    addBeginNode("L0");