我需要在使用jsPDF创建的PDF中绘制一条虚线(https://mrrio.github.io/jsPDF/doc/symbols/jsPDF.html)
创建一个简单的行:
doc.line(20, 25, 60, 25);
如何创建虚线或虚线?
答案 0 :(得分:8)
我遇到了同样的问题,并且这样做了:
/**
* Draws a dotted line on a jsPDF doc between two points.
* Note that the segment length is adjusted a little so
* that we end the line with a drawn segment and don't
* overflow.
*/
function dottedLine(doc, xFrom, yFrom, xTo, yTo, segmentLength)
{
// Calculate line length (c)
var a = Math.abs(xTo - xFrom);
var b = Math.abs(yTo - yFrom);
var c = Math.sqrt(Math.pow(a,2) + Math.pow(b,2));
// Make sure we have an odd number of line segments (drawn or blank)
// to fit it nicely
var fractions = c / segmentLength;
var adjustedSegmentLength = (Math.floor(fractions) % 2 === 0) ? (c / Math.ceil(fractions)) : (c / Math.floor(fractions));
// Calculate x, y deltas per segment
var deltaX = adjustedSegmentLength * (a / c);
var deltaY = adjustedSegmentLength * (b / c);
var curX = xFrom, curY = yFrom;
while (curX <= xTo && curY <= yTo)
{
doc.line(curX, curY, curX + deltaX, curY + deltaY);
curX += 2*deltaX;
curY += 2*deltaY;
}
}
答案 1 :(得分:1)
jsPDF
的更高版本具有内置功能:
setLineDash
[Docs]
例如,以下示例绘制一条虚线,该虚线表示绘制的10mm的线,然后沿着从左到右的方向重复10mm的空间。我假设您正在绘制具有所有默认设置(即A4,毫米单位等)的页面:
doc.setLineDash([10, 10], 0);
doc.line(20, 25, 60, 25);
下面将绘制7mm的线,3mm的空间,1mm的线,3mm的空间,然后重复,但是,它将在10mm处开始图案,因此要绘制的虚线的第一部分是1mm的部分:
doc.setLineDash([7, 3, 1, 3], 10);
doc.line(20, 25, 60, 25);