public void UpdateTransparent(int x, int y, int r)
{
FogTransparentRange rangeData = null;
if (!fogRangeDic.ContainsKey(r))
{
rangeData = new FogTransparentRange(r);
fogRangeDic [r] = rangeData;
}
else
{
rangeData = fogRangeDic [r];
}
/// 先求取视野范围内的有效坐标
/// 即根据视点坐标求出视野范围内有效用于战场的尺寸范围
/// 有效坐标奉行小闭大开原则
//if (x - r >= 0) {
// vl = 0;
//} else {
// vl = r - x;
//}
int view_l = (x - r >= 0) ? 0 : (r - x);
//if (x + r < w) {
// vr = 2 * r + 1;
//} else {
// vr = r - x + w;
//}
int view_r = (x + r < w) ? (2 * r + 1) : (r - x + w);
//if (y - r >= 0) {
// vt = 0;
//} else {
// vt = r - y;
//}
int view_t = (y - r >= 0) ? 0 : (r - y);
//if (y + r < h) {
// vb = 2 * r + 1;
//} else {
// vb = r - y + h;
//}
int view_b = (y + r < h) ? (2 * r + 1) : (r - y + h);
int view_lt_x = x - r;
int view_lt_y = y - r;
/// 操作九宫格四边 上（y值为0开始）
_UpdateTransparentTop(rangeData, view_lt_x, view_lt_y, view_l, view_r, view_t, view_b);
/// 操作九宫格四边 左（x值为0开始）
_UpdateTransparentLeft(rangeData, view_lt_x, view_lt_y, view_l, view_r, view_t, view_b);
/// 操作九宫格中心全部为透明区域
_UpdateTransparentCenter(rangeData, view_lt_x, view_lt_y, view_l, view_r, view_t, view_b);
/// 操作九宫格四边 右
_UpdateTransparentRight(rangeData, view_lt_x, view_lt_y, view_l, view_r, view_t, view_b);
/// 操作九宫格四边 下
_UpdateTransparentBottom(rangeData, view_lt_x, view_lt_y, view_l, view_r, view_t, view_b);
/// 忽略九宫格四角
}
private void _UpdateTransparentCenter(FogTransparentRange rangeData,
int view_lt_x, int view_lt_y,
int view_left, int view_right, int view_top, int view_bottom)
{
int xMin = Max(view_left, rangeData.l);
int xMax = Min(view_right, rangeData.r + 1);
int yMin = Max(view_top, rangeData.t);
int yMax = Min(view_bottom, rangeData.b + 1);
if (xMin < xMax && yMin < yMax)
{
for (int i = xMin, j = 0; i < xMax; i++)
{
for (j = yMin; j < yMax; j++)
{
SetTransparent(view_lt_x + i, view_lt_y + j);
}
}
}
}
