如果原链码为1,0,1,0,3,3,2,2,你能帮我求解差分链码吗?给出详细过程,谢谢你
时间: 2024-04-04 07:29:20 浏览: 22
当给出一组链码时,我们可以通过求解差分链码来更好地理解它。差分链码是指从原始链码中每个点到下一个点的差异值组成的链码。下面是求解差分链码的详细步骤:
1. 首先,我们需要将原始链码转换为坐标形式。假设链码起点坐标为(0,0),我们可以按照以下规则将链码转换为坐标:
- 对于奇数位的链码,x坐标增加或减少1,y坐标保持不变。
- 对于偶数位的链码,y坐标增加或减少1,x坐标保持不变。
通过这种方式,我们可以得到以下坐标:
(0,0) -> (1,0) -> (1,-1) -> (0,-1) -> (0,-2) -> (-1,-2) -> (-1,-1) -> (0,-1)
2. 接下来,我们需要计算每个点与下一个点之间的差异值。差异值可以通过下一个点的坐标减去当前点的坐标得出。例如,第一个差异值为(1-0,0-0),即(1,0)。通过这种方式,我们可以得到以下差分链码:
(1,0) -> (0,-1) -> (-1,0) -> (0,-1) -> (-1,0) -> (1,1) -> (1,0)
因此,差分链码为1,0,-1,0,-1,1,1。
希望这个解答能够帮到你!
相关问题
已知四方向链码为10103321,一阶差分链码为
根据四方向链码求一阶差分链码的方法是将相邻的链码对应的方向转换为相应的一阶链码方向,然后再将相邻的一阶链码方向求差分。四方向链码中的方向对应的一阶链码方向如下:
- 0:向右(E)
- 1:向上右(NE)
- 2:向上(N)
- 3:向上左(NW)
- 4:向左(W)
- 5:向下左(SW)
- 6:向下(S)
- 7:向下右(SE)
所以,根据四方向链码10103321,可以得到一阶链码为ENNNWWWS,将相邻的一阶链码求差分,得到一阶差分链码为(1,-3,0,-2,-1,-3)。
你能用java写一个hyperledger fabric平台的auction智能合约链码吗
当然可以,以下是一个简单的Hyperledger Fabric平台的auction智能合约链码的Java实现示例:
```java
package org.example.auction;
import org.hyperledger.fabric.contract.Context;
import org.hyperledger.fabric.contract.ContractInterface;
import org.hyperledger.fabric.contract.annotation.Contract;
import org.hyperledger.fabric.contract.annotation.Default;
import org.hyperledger.fabric.contract.annotation.Info;
import org.hyperledger.fabric.contract.annotation.Transaction;
import org.hyperledger.fabric.shim.ChaincodeException;
import org.hyperledger.fabric.shim.ChaincodeStub;
import org.json.JSONObject;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
@Contract(
name = "auction",
info = @Info(
title = "Auction Contract",
description = "Auction Smart Contract",
version = "1.0"
)
)
@Default
public final class Auction implements ContractInterface {
private enum AssetStatus {
FOR_SALE,
SOLD,
REMOVED
}
private static final String ASSET_PREFIX = "asset";
private static final String OWNER_PREFIX = "owner";
private static final String BID_PREFIX = "bid";
@Transaction
public void createAsset(Context ctx, String assetId, String owner, String description, int reservePrice) {
ChaincodeStub stub = ctx.getStub();
if (assetExists(stub, assetId)) {
throw new ChaincodeException("Asset " + assetId + " already exists");
}
Asset asset = new Asset(description, owner, reservePrice, AssetStatus.FOR_SALE);
String assetJSON = asset.toJSONString();
stub.putStringState(ASSET_PREFIX + assetId, assetJSON);
stub.putStringState(OWNER_PREFIX + assetId, owner);
}
@Transaction
public String readAsset(Context ctx, String assetId) {
ChaincodeStub stub = ctx.getStub();
String assetJSON = stub.getStringState(ASSET_PREFIX + assetId);
if (assetJSON == null || assetJSON.isEmpty()) {
throw new ChaincodeException("Asset " + assetId + " does not exist");
}
return assetJSON;
}
@Transaction
public void updateAsset(Context ctx, String assetId, String newOwner, String newDescription, int newReservePrice) {
ChaincodeStub stub = ctx.getStub();
if (!assetExists(stub, assetId)) {
throw new ChaincodeException("Asset " + assetId + " does not exist");
}
Asset asset = new Asset(newDescription, newOwner, newReservePrice, AssetStatus.FOR_SALE);
String assetJSON = asset.toJSONString();
stub.putStringState(ASSET_PREFIX + assetId, assetJSON);
stub.putStringState(OWNER_PREFIX + assetId, newOwner);
}
@Transaction
public void removeAsset(Context ctx, String assetId) {
ChaincodeStub stub = ctx.getStub();
if (!assetExists(stub, assetId)) {
throw new ChaincodeException("Asset " + assetId + " does not exist");
}
stub.delState(ASSET_PREFIX + assetId);
stub.delState(OWNER_PREFIX + assetId);
List<Bid> bids = getAllBidsForAsset(ctx, assetId);
for (Bid bid : bids) {
stub.delState(BID_PREFIX + bid.getId());
}
Asset asset = new Asset("", "", 0, AssetStatus.REMOVED);
String assetJSON = asset.toJSONString();
stub.putStringState(ASSET_PREFIX + assetId, assetJSON);
}
@Transaction
public void placeBid(Context ctx, String assetId, String bidder, int amount) {
ChaincodeStub stub = ctx.getStub();
if (!assetExists(stub, assetId)) {
throw new ChaincodeException("Asset " + assetId + " does not exist");
}
if (!isAssetForSale(stub, assetId)) {
throw new ChaincodeException("Asset " + assetId + " is not for sale");
}
List<Bid> bids = getAllBidsForAsset(ctx, assetId);
int highestBid = getHighestBidAmount(bids);
if (highestBid >= amount) {
throw new ChaincodeException("Bid amount must be higher than the current highest bid");
}
Bid bid = new Bid(assetId, bidder, amount);
String bidJSON = bid.toJSONString();
stub.putStringState(BID_PREFIX + bid.getId(), bidJSON);
}
@Transaction
public String getHighestBid(Context ctx, String assetId) {
ChaincodeStub stub = ctx.getStub();
List<Bid> bids = getAllBidsForAsset(ctx, assetId);
int highestBid = getHighestBidAmount(bids);
JSONObject result = new JSONObject();
result.put("asset_id", assetId);
result.put("highest_bid", highestBid);
return result.toString();
}
private boolean assetExists(ChaincodeStub stub, String assetId) {
String assetJSON = stub.getStringState(ASSET_PREFIX + assetId);
return assetJSON != null && !assetJSON.isEmpty();
}
private boolean isAssetForSale(ChaincodeStub stub, String assetId) {
String assetJSON = stub.getStringState(ASSET_PREFIX + assetId);
if (assetJSON == null || assetJSON.isEmpty()) {
return false;
}
Asset asset = Asset.fromJSONString(assetJSON);
return asset.getStatus() == AssetStatus.FOR_SALE;
}
private List<Bid> getAllBidsForAsset(Context ctx, String assetId) {
ChaincodeStub stub = ctx.getStub();
List<Bid> bids = new ArrayList<>();
String startKey = BID_PREFIX + "0";
String endKey = BID_PREFIX + "zzz";
List<String> bidKeys = stub.getStateByRange(startKey, endKey);
for (String bidKey : bidKeys) {
String bidJSON = stub.getStringState(bidKey);
Bid bid = Bid.fromJSONString(bidJSON);
if (bid.getAssetId().equals(assetId)) {
bids.add(bid);
}
}
return bids;
}
private int getHighestBidAmount(List<Bid> bids) {
int highestBid = 0;
for (Bid bid : bids) {
if (bid.getAmount() > highestBid) {
highestBid = bid.getAmount();
}
}
return highestBid;
}
private static final class Asset {
private final String description;
private final String owner;
private final int reservePrice;
private final AssetStatus status;
Asset(String description, String owner, int reservePrice, AssetStatus status) {
this.description = description;
this.owner = owner;
this.reservePrice = reservePrice;
this.status = status;
}
static Asset fromJSONString(String assetJSON) {
JSONObject obj = new JSONObject(assetJSON);
String description = obj.getString("description");
String owner = obj.getString("owner");
int reservePrice = obj.getInt("reserve_price");
AssetStatus status = AssetStatus.valueOf(obj.getString("status"));
return new Asset(description, owner, reservePrice, status);
}
String toJSONString() {
JSONObject obj = new JSONObject();
obj.put("description", description);
obj.put("owner", owner);
obj.put("reserve_price", reservePrice);
obj.put("status", status.toString());
return obj.toString();
}
AssetStatus getStatus() {
return status;
}
}
private static final class Bid {
private final String id;
private final String assetId;
private final String bidder;
private final int amount;
Bid(String assetId, String bidder, int amount) {
this.id = assetId + "_" + bidder;
this.assetId = assetId;
this.bidder = bidder;
this.amount = amount;
}
String toJSONString() {
JSONObject obj = new JSONObject();
obj.put("id", id);
obj.put("asset_id", assetId);
obj.put("bidder", bidder);
obj.put("amount", amount);
return obj.toString();
}
String getId() {
return id;
}
String getAssetId() {
return assetId;
}
int getAmount() {
return amount;
}
static Bid fromJSONString(String bidJSON) {
JSONObject obj = new JSONObject(bidJSON);
String id = obj.getString("id");
String assetId = obj.getString("asset_id");
String bidder = obj.getString("bidder");
int amount = obj.getInt("amount");
Bid bid = new Bid(assetId, bidder, amount);
bid.id = id;
return bid;
}
}
}
```
这个智能合约链码实现了创建,读取,更新和删除资产以及竞标功能。它使用JSON格式存储资产和竞标,并使用链码存储和检索这些数据。这只是一个简单的实现示例,实际应用中可能需要更多的功能和安全性。
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