Minecraft Utilities 1.0 (lib/minecraftUtils.js)

// Minecraft Utilities By Mp0wers
// License: MIT
// Version: 1.0
//
// Special thanks to developers of LiquidBounce and WurstClient.

var EnumFacing = Java.type("net.minecraft.util.EnumFacing");
var Vec3 = Java.type("net.minecraft.util.Vec3");

function getCenterOfBlockSide(blockPosIn, sideIn) {
    var posVec = new Vec3(blockPosIn).addVector(0.5, 0.5, 0.5);
    var dirVec = new Vec3(sideIn.getDirectionVec());
    var resultVec = posVec.addVector(dirVec.xCoord * 0.5, dirVec.yCoord * 0.5, dirVec.zCoord * 0.5);
    return resultVec;
};

function isBlockInReach(entityIn, blockPosIn) {
    var reachDistance = mc.playerController.getBlockReachDistance() + 0.25;
    var eyesPos = entityIn.getPositionEyes(1.0);
    var closestSide = getClosestBlockSide(eyesPos, blockPosIn);
    var closestSideCenter = getCenterOfBlockSide(blockPosIn, closestSide);
    if (eyesPos.distanceTo(closestSideCenter) <= reachDistance) {
        return true;
    };
    return false;
};

function getClosestBlockSide(vectorIn, blockPosIn) {
    var blockSide, blockSideCenter, distanceToBlockSide, closestSide;
    var lowestDistance = null;
    var i;
    for (i in EnumFacing.values()) {
        blockSide = EnumFacing.values()[i];
        blockSideCenter = getCenterOfBlockSide(blockPosIn, blockSide);
        distanceToBlockSide = vectorIn.distanceTo(blockSideCenter);
        if (lowestDistance == null || distanceToBlockSide < lowestDistance) {
            lowestDistance = distanceToBlockSide;
            closestSide = blockSide;
        };
    };
    return closestSide;
};