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Initial version of canvas contract

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This commit is contained in:
Richard Ramos 2018-09-21 15:14:41 -04:00
parent d75bc7a2ca
commit 2a368a8695
1 changed files with 47 additions and 46 deletions
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93
contracts/visual_identity/Canvas.sol
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@ -30,27 +30,38 @@ contract Canvas is Controlled {
mapping(address => uint) public balances;
address[] players;
address[] public players;
mapping(address => uint) public playerIndex;
mapping(address => uint) public playerAmountToTax;
mapping(address => uint[]) public playerPixelsX;
mapping(address => uint[]) public playerPixelsY;
mapping(address => uint) playerIndex;
uint public priceUpdatePeriod = 2 hours; // How long until the price of a pixel can be updated
uint public lastTax;
uint public taxPeriod = 30 minutes; // How much time between taxes
uint public taxPercentage = 5;
uint public taxPercentage = 10;
constructor(address _token) public {
token = ERC20Token(_token);
players.push(msg.sender);
players.push(address(0));
}
/// @notice Add funds to your balance. Tax will be deducted from these funds
function addFunds(uint amount) public {
require(token.transferFrom(msg.sender, address(this), amount));
require(token.allowance(msg.sender, address(this)) >= amount, "Allowance isn't set");
require(token.transferFrom(msg.sender, address(this), amount), "Couldn't transfer funds");
token.approve(msg.sender, amount);
balances[msg.sender] += amount;
if(playerIndex[msg.sender] == 0 ){
uint idx = players.push(msg.sender) - 1;
playerIndex[msg.sender] = idx;
}
}
/// @notice Withdraw funds from your balance
@ -58,8 +69,7 @@ contract Canvas is Controlled {
require(amount > 0, "Amount must be greater than 0");
require(balances[msg.sender] - amount <= balances[msg.sender], "Amount to withdraw must not be greater than balance");
balances[msg.sender] -= amount;
require(token.transfer(msg.sender, amount));
require(token.transfer(msg.sender, amount), "Couldn't transfer funds");
}
@ -73,12 +83,8 @@ contract Canvas is Controlled {
Pixel storage p = grid[x][y];
if(p.owner == msg.sender) return;
if(playerIndex[msg.sender] == 0 && msg.sender != controller){
uint idx = players.push(msg.sender) - 1;
playerIndex[msg.sender] = idx;
}
if(p.owner == address(0)){
// Empty pixel
require(balances[msg.sender] >= priceIfEmpty, "Not enough balance. Add more funds");
@ -91,36 +97,21 @@ contract Canvas is Controlled {
require(balances[msg.sender] >= p.price, "Not enough balance. Add more funds");
balances[msg.sender] -= p.price;
balances[p.owner] += p.price;
playerAmountToTax[p.owner] -= p.price;
}
p.lastPriceUpdate = 0; // New owner can change the price now
p.owner = msg.sender;
p.shapeIndex = shapeIndex;
playerPixelsX[msg.sender].push(x);
playerPixelsY[msg.sender].push(y);
playerAmountToTax[msg.sender] += p.price;
emit PixelDrawn(msg.sender, x, y, p.price);
}
/// @notice Leave the game, withdrawing the resulting balance, and returning your pixels to the public
function leaveTheGame() public {
// TODO: check performance.
// Probably it's more efficient for each owner to have an array of indexes that point to their pixels
for(uint x = 0; x < GRID_X; x++){
for(uint y = 0; y < GRID_Y; y++){
Pixel storage p = grid[x][y];
if(p.owner == msg.sender){
// Release the properties to the public
p.owner = address(0);
p.lastPriceUpdate = 0;
p.price = 0;
}
}
}
withdrawFunds(balances[msg.sender]);
}
function canApplyTax() public view returns(bool){
return lastTax + taxPeriod < block.timestamp;
}
@ -139,22 +130,29 @@ contract Canvas is Controlled {
lastTax = block.timestamp;
// TODO: check performance
for(uint x = 0; x < GRID_X; x++){
for(uint y = 0; y < GRID_Y; y++){
Pixel storage p = grid[x][y];
if(p.owner != address(0)){
uint taxAmount = p.price * taxPercentage / 100;
if(balances[msg.sender] < taxAmount){
p.owner = address(0);
p.price = 0;
p.lastPriceUpdate = 0;
} else {
balances[msg.sender] -= taxAmount;
publicBalance += taxAmount;
for(uint i = 1; i < players.length; i++){
uint taxAmount = playerAmountToTax[players[i]] * taxPercentage / 100;
if(balances[players[i]] < taxAmount){
// If you ain't got enough money for your pixels, you lose everything :(
for(uint j = 0; j < playerPixelsX[players[i]].length; j++){
uint x = playerPixelsX[players[i]][j];
uint y = playerPixelsY[players[i]][j];
if(grid[x][y].owner == players[i]){
grid[x][y].owner = address(0);
grid[x][y].price = 0;
grid[x][y].lastPriceUpdate = 0;
delete playerPixelsX[players[i]];
delete playerPixelsY[players[i]];
}
}
} else {
balances[msg.sender] -= taxAmount;
publicBalance += taxAmount;
}
}
emit TaxApplied(block.timestamp);
}
@ -190,13 +188,16 @@ contract Canvas is Controlled {
require(p.owner == msg.sender, "You're not the owner of this pixel");
require(p.lastPriceUpdate + priceUpdatePeriod < block.timestamp, "You cannot update the price yet");
playerAmountToTax[msg.sender] -= p.price;
playerAmountToTax[msg.sender] += newPrice;
p.price = newPrice;
p.lastPriceUpdate = block.timestamp;
emit PixelPriceUpdated(x, y, newPrice);
}
/// @notice After the hackathon ends, we return the SNT balances available to users
function gameOver() public onlyController {
// TODO: check performance. Shouldn't matter in a sidechain, I guess