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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title></title>
<style type="text/css">
html,body{
margin: 0 0;
padding: 0 0;
width: 100%;
height: 100%;
overflow: hidden;
}
/*#canvas{
width: 100%;
height: 100%;
}*/
#next{
position: fixed;
bottom: 0px;
right: 0px;
width: 20px;
height: 20px;
background: firebrick;
opacity: 0.6;
}
#before{
position: fixed;
bottom: 0px;
left: 0px;
width: 20px;
height: 20px;
background: firebrick;
opacity: 0.6;
}
</style>
</head>
<body>
<!--<div id="next"></div>
<div id="before"></div>-->
<canvas id="canvas" ></canvas>
<script src="js/index.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
var canvas = document.getElementById("canvas");
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
var ctx = canvas.getContext("2d");
/*字体尺寸*/
var font = {
size: 16
}
/*面板尺寸*/
var panel = {
col: Math.floor(canvas.width / font.size),//列数
row: Math.floor(canvas.height / font.size),//行数
space: 2,
}
ctx.fillStyle = "black";
ctx.font = font.size + "px 微软雅黑";
var str_write = txt.t;
var str_write_list = str_write.split("\r\n");
/*本页开始*/
var page_begin = {
line: 0,//当前行
offset: 0//当前偏移量
};
/*本页结束*/
var page_end = {
line: 0,//当前行
offset: 0//当前偏移量
}
/*下一屏页*/
function write(){
var cur = page_end.line;
page_begin.line = page_end.line;
page_begin.offset = page_end.offset;
check(cur);
}
/*开始真实绘制下一屏*/
function check(current){
ctx.clearRect(0,0,canvas.width,canvas.height);
var total = panel.col * panel.row * 2;//字符有占一位和两位的，一行最多可绘制2倍长度
var count = 0;
var tag = false;
var tmp_all_write = [];
var isBreak = false;//检查是否正常跳出
while(current < str_write_list.length){
var len = str_write_list[current].length;
var tmp_write = [];
var str = str_write_list[current];
var start = 0;
if(!tag){
start = page_end.offset;
tag = true;
}
var tmp = 0;
var begin = start;
for(var i = start; i < len ; i ++ ){
//逐个检查
if(tmp >= panel.col * 2 - 1){
tmp_write.push(str.substring(begin,i));
begin = i;
tmp = 0;
}
var len_char = 1;
if(str.charCodeAt(i) > 128){
len_char = 2;
}
tmp += len_char;
}
if(tmp > 0){
tmp_write.push(str.substring(begin,i))
}
if(str == "") {
tmp_write.push("");
};
var offset = 0;
if(tmp_all_write.length + tmp_write.length > panel.row) {
for(var i = 0 ; i < tmp_all_write.length ; i ++){
ctx.fillText(tmp_all_write[i],0, (i + 1) * font.size);
}
for(var j = 0 ; j < tmp_write.length && j + i < panel.row ; j ++){
offset += tmp_write[j].length;
ctx.fillText(tmp_write[j],0, (i + j + 1) * font.size);
}
page_end.line = current;
page_end.offset = offset;
isBreak = true;
break ;
}
tmp_all_write = tmp_all_write.concat(tmp_write);
current ++;
}
/*未正常跳出，表示到达书尾，直接绘制*/
if(!isBreak){
for(var i = 0 ; i < tmp_all_write.length ; i ++){
ctx.fillText(tmp_all_write[i],0, (i + 1) * font.size);
}
}
}
/*绘制首屏*/
write();
// document.getElementById("next").addEventListener("click",function(){
// if(page_end.line >= str_write_list.length) return false;
// write();
//
// });
//
// document.getElementById("before").addEventListener("click",function(){
// if(page_begin.line <= 0) return false;
// write_before();
//
// });
/*上一页*/
function write_before(){
var tag = false;
var total = panel.col * panel.row * 2;
var count = 0;
var line = page_begin.offset > 0 ? page_begin.line : page_begin.line - 1 ;
var t = 0;
var tmp_all_write = [];
while(line >= 0){
var len = str_write_list[line].length;
var tmp_write = [];
var str = str_write_list[line];
var start = len;
if(!tag){
if(page_begin.offset > 0 ){
start = page_begin.offset
}
tag = true;
}
var tmp = 0;
var begin = 0;
for(var i = 0; i < start ; i ++ ){
//逐个检查
if(tmp >= panel.col * 2 - 1){
tmp_write.push(str.substring(i,begin));
begin = i;
tmp = 0;
}
var len_char = 1;
if(str.charCodeAt(i) > 128){
len_char = 2;
}
tmp += len_char;
}
if(tmp > 0){
tmp_write.push(str.substring(begin,i))
}
/*此行为空行，也单独占一行*/
if(str == "") {
tmp_write.push("");
};
var offset = 0;
if(tmp_all_write.length + tmp_write.length >= panel.row) {
ctx.clearRect(0,0,canvas.width,canvas.height);
var y = panel.row;
for(var i = tmp_all_write.length - 1 ; i >= 0 ; i --){
ctx.fillText(tmp_all_write[i],0, (y--) * font.size);
}
i = tmp_all_write.length;
//
var k = 0;
for(var j = tmp_write.length - 1 ; j >= 0 && (k + i) < panel.row ; j --){
offset += tmp_write[j].length;
k++;
ctx.fillText(tmp_write[j],0, (y--) * font.size);
}
/*重置页尾数据*/
page_end.line = page_begin.line;
page_end.offset = page_begin.offset;
/*重置页头数据*/
page_begin.line = line;
page_begin.offset = str.length - offset;
break
}
tmp_all_write = tmp_write.concat(tmp_all_write);
line --;
}
}
document.addEventListener("click",function(e){
var x = e.pageX;
if(x > canvas.width / 2){
write();
}else{
write_before();
}
});
</script>
</body>
</html>