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HTml js 生成图片
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了HTml js 生成图片，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含3824字，纯文字阅读大概需要6分钟。
内容图文
<
script
type
="text/javascript"
>
function
$(id) {
return
document.getElementById(id);
}
function
textToImg() {
var
len
=
$(
‘
len
‘
).value
||
30
;
var
i
=
0
;
var
fontSize
=
$(
‘
fontSize
‘
).value
||
15
;
var
fontWeight
=
$(
‘
fontWeight
‘
).value
||
‘
normal
‘
;
var
txt
=
$(
"
txt
"
).value;
var
canvas
=
$(
‘
canvas
‘
);
if
(txt
==
‘‘
) {
alert(
‘
请输入文字！
‘
);
$(
"
txt
"
).focus();
}
if
(len
>
txt.length) {
len
=
txt.length;
}
canvas.width
=
fontSize
*
len;
canvas.height
=
fontSize
*
(
3
/
2
)
*
(Math.ceil(txt.length
/
len)
+
txt.split(
‘
\n
‘
).length
-
1
);
var
context
=
canvas.getContext(
‘
2d
‘
);
context.clearRect(
0
,
0
, canvas.width, canvas.height);
context.fillStyle
=
$(
"
showcolor
"
).innerHTML;
context.font
=
fontWeight
+
‘
‘
+
fontSize
+
‘
px sans-serif
‘
;
context.textBaseline
=
‘
top
‘
;
canvas.style.display
=
‘
none
‘
;
console.log(txt.length);
function
fillTxt(text) {
while
(text.length
>
len) {
var
txtLine
=
text.substring(
0
, len);
text
=
text.substring(len);
context.fillText(txtLine,
0
, fontSize
*
(
3
/
2
)
*
i
++
,
canvas.width);
}
context.fillText(text,
0
, fontSize
*
(
3
/
2
)
*
i, canvas.width);
}
var
txtArray
=
txt.split(
‘
\n
‘
);
for
(
var
j
=
0
; j
<
txtArray.length; j
++
) { fillTxt(txtArray[j]); context.fillText(
‘
\n
‘
,
0
, fontSize
*
(
3
/
2
)
*
i
++
, canvas.width); }
var
imageData
=
context.getImageData(
0
,
0
, canvas.width, canvas.height);
var
img
=
$(
"
img
"
); img.src
=
canvas.toDataURL(
"
image/png
"
); }
function
changeColor() {
var
c
=
$(
"
text
"
);
var
ctx
=
c.getContext(
"
2d
"
);
var
red
=
$(
"
red
"
);
var
green
=
$(
"
green
"
);
var
blue
=
$(
"
blue
"
); ctx.fillStyle
=
"
rgb(
"
+
red.value
+
"
,
"
+
green.value
+
"
,
"
+
blue.value
+
"
)
"
; $(
"
showcolor
"
).innerHTML
=
ctx.fillStyle; ctx.fillRect(
0
,
0
,
100
,
100
);
//
$(‘canvas‘).getContext(‘2d‘).fillStyle=$("showcolor").innerHTML; } </script>
<
div
>
<
textarea id
=
"
txt
"
style
=
"
width:450px;height:400px;
"
>
如果您的长微博字数超过了140个字的限制，在这里输入微博内容，点击右方的“生成图片”，鼠标右击右边“文字”，“图片另存为...”，保存图片后，就可以直接发到微博里了，赶紧试试吧！
<
/
textarea>
<
/
div>
<
div style
=
"
width:200px;height:100px;float:left;clear:right;
"
>
<
table
>
<
tbody
>
<
tr
>
<
td
>
<
label
>
字体大小:
<
/
label><input size="4" id="fontSize" value="15"
/
>
px
<
/
td>
<
/
tr>
<
tr
>
<
td
>
<
label
>
字体精细:
<
/
label><select id="fontWeight"> <option value="normal">正常<
/
option
>
<
option value
=
"
bold
"
>
粗
<
/
option>
<
/
select>
<
/
td>
<
/
tr>
<
tr
>
<
td
>
<
label
>
每行显示:
<
/
label><input size="4" id="len" value="40"
/
>
个字
<
/
td>
<
/
tr>
<
tr
>
<
td
>
<
canvas id
=
"
text
"
width
=
"
100
"
height
=
"
100
"
><
/
canvas>
<
p
>
Red：
<
input type
=
"
range
"
id
=
"
red
"
min
=
"
0
"
max
=
"
255
"
value
=
"
0
"
onchange
=
"
changeColor();
"
/
>
<
/
p>
<
p
>
Green：
<
input type
=
"
range
"
id
=
"
green
"
min
=
"
0
"
max
=
"
255
"
value
=
"
0
"
onchange
=
"
changeColor();
"
/
>
<
/
p>
<
p
>
Blue：
<
input type
=
"
range
"
id
=
"
blue
"
min
=
"
0
"
max
=
"
255
"
value
=
"
0
"
onchange
=
"
changeColor();
"
/
>
<
/
p>
目前的颜色:
<
span id
=
"
showcolor
"
><
/
span>
<
/
td>
<
/
tr>
<
tr
>
<
td
>
<
button onclick
=
"
textToImg();;
"
>
生成图片
<
/
button>
<
/
td>
<
/
tr>
<
/
tbody>
<
/
table>
<
/
div>
<
canvas id
=
"
canvas
"
style
=
"
display:block;
"
><
/
canvas>
<
div
>
<
img id
=
"
img
"
style
=
"
border:1px solid;
"
/
>
<
/
div>
<
script
>
changeColor();
</
script
>
原文：http://www.cnblogs.com/zendu/p/4987985.html
内容总结
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