- bool set_gradient(ValueNode::Handle a);
- bool set_count(ValueNode::Handle b);
- bool set_width(ValueNode::Handle x);
- bool set_specify_start(ValueNode::Handle a);
- bool set_specify_end(ValueNode::Handle a);
- bool set_start_color(ValueNode::Handle a);
- bool set_end_color(ValueNode::Handle a);
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