图像映射
图像映射也称为图像热点。
作用:
让同一张图片上的不同区域,可以实现多个不同的超链接功能。
图示:
图像映射的实现需要三方面配合完成:
1、图像映射容器,就是一个img标签,需使用usemap属性与map标签建立联系
2、图像映射,就是一个map标签,需要使用name属性与map标签建立联系
3、热点区域,需要使用map标签的子标签area来建立热点区域
语法格式:
属性介绍:
需要使用的属性:
usemap:#map的名称
name:设置热点区域的名称
的常用属性:
shape:设置热点区域的形状
rect(矩形)、
circle(圆形)、
polygon(多边形)
coords:热点区域的位置坐标,根据shape的不同而不同。
对于rect,坐标为(x1,y1,x2,y2),(x1,y1)矩形左上角,(x2,y2)右下角
对于circle,坐标为(x,y,r),(x,y)圆心坐标,r为半径
对于polygon,坐为(x1,y1,x2,y2,…xn,yn),(xn,yn)为第n个顶点坐标
举例:
-
矩形
-
圆形
-
不规则多边形

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