有没有一些好的图形应用程序库?我想创建节点,添加加权边缘等。
编辑
我需要一个图形(如下面的图像)而不是绘图。
有没有一些好的图形应用程序库?我想创建节点,添加加权边缘等。
我需要一个图形(如下面的图像)而不是绘图。
- (void) testGraph {
Agraph_t* G;
GVC_t* gvc;
gvc = gvContext();
char* testGraph = "\
digraph G {\
subgraph cluster_c0 {a0 -> a1 -> a2 -> a3;}\
subgraph cluster_c1 {b0 -> b1 -> b2 -> b3;}\
x -> a0;\
x -> b0;\
a1 -> a3;\
a3 -> a0;\
}";
G = agmemread((char*)testGraph);
[self dumpGraph:G];
gvLayout (gvc, G, "dot");
NSLog(@"after layout:");
[self dumpGraph:G];
gvFreeLayout(gvc, G);
gvFreeContext(gvc);
}
- (void) printNode:(Agnode_t*) node {
NSLog(@"Node: %s {{%f,%f},{%f,%f}}",node->name,
node->u.coord.x,
node->u.coord.y,
ND_width(node),
ND_height(node));
}
- (void) dumpGraph:(Agraph_t*)graph {
if (!graph)
return;
Agnode_t *n = NULL;
Dict_t *dict = graph->nodes;
for (n= dtfirst(dict); n ; n = dtnext(dict, n)) {
[self printNode:n];
}
}
不要使用logNode:你应该编写一些绘图代码。
日志输出:
GraphTest[32319:303] Node: a0 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: a1 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: a2 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: a3 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: b0 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: b1 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: b2 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: b3 {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] Node: x {{0.000000,0.000000},{0.000000,0.000000}}
GraphTest[32319:303] after layout:
GraphTest[32319:303] Node: a0 {{83.000000,250.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: a1 {{63.000000,178.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: a2 {{43.000000,106.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: a3 {{83.000000,34.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: b0 {{161.000000,250.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: b1 {{161.000000,178.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: b2 {{161.000000,106.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: b3 {{161.000000,34.000000},{0.750000,0.500000}}
GraphTest[32319:303] Node: x {{122.000000,322.000000},{0.750000,0.500000}}
它不是非常适用于Cocoa,但是Graphviz可能会满足您大部分的需求,或者为您自己的工作提供很好的基础。也就是说,graphviz库可以处理所有图形布局逻辑,并告诉您在哪里放置图形,然后使用您最喜欢的图形API进行绘制。例如,这就是OmniGraffle自动布局功能的工作原理。
如果你可以限制自己只使用Mountain Lion及以上版本,那么SceneKit似乎是一个很有前途的起点。你需要自己管理布局几何(节点/边缘的实际位置),但你可以免费获得命中测试和几何基元。属性和纹理是可动画化的:你可以通过你喜欢的Core Animation样式调用来放大节点、变暗边缘、改变数字或颜色等。