public void drawOn(StringBuilder input) {
if (!isEnable()) return;
printLinkStartElement(input);
stringTemplate.reset();
double x1, x2, y1, y2;
x1 = sourceEntity.getXInLayout() + sourceEntity.getWidthInLayout() / 2.0;
y1 = sourceEntity.getYInLayout() + sourceEntity.getHeightInLayout() / 2.0;
x2 = destinationEntity.getXInLayout() + destinationEntity.getWidthInLayout() / 2.0;
y2 = destinationEntity.getYInLayout() + destinationEntity.getHeightInLayout() / 2.0;
stringTemplate.setAttribute("X1", x1);
stringTemplate.setAttribute("X2", x2);
stringTemplate.setAttribute("Y1", y1);
stringTemplate.setAttribute("Y2", y2);
double midX = (x1 + x2) / 2.0;
double midY = (y1 + y2) / 2.0;
stringTemplate.setAttribute("M1", midX);
stringTemplate.setAttribute("M2", midY);
stringTemplate.setAttribute("WIDTH", linewidth);
stringTemplate.setAttribute("COLOR", SVGUtils.formatToHex(color.getRGB()));
stringTemplate.setAttribute("OPAQUE", opaque);
input.append(stringTemplate.toString());
printLinkEndElement(input);
}
