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| public static int plot(int x1, int y1, int x2, int y2, int wCell, int hCell, int[] xy) { int xOffset = (-Math.min(0, Math.min(x1, x2)) + wCell - 1) / -wCell; int yOffset = (-Math.min(0, Math.min(y1, y2)) + hCell - 1) / -hCell; x1 -= xOffset * wCell; y1 -= yOffset * hCell; x2 -= xOffset * wCell; y2 -= yOffset * hCell; assert (x1 | y1 | x2 | y2) >= 0;
if (x1 > x2) { int t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t; }
int p = 0;
int xCell1 = (int) ((x1 + 0.5f) / wCell); int yCell1 = (int) ((y1 + 0.5f) / hCell); int xCell2 = (int) ((x2 + 0.5f) / wCell); int yCell2 = (int) ((y2 + 0.5f) / hCell);
int yMin = Math.min(y1, y2); int yMax = Math.max(y1, y2); int yCellMin = Math.min(yCell1, yCell2); int yCellMax = Math.max(yCell1, yCell2);
if (xCell1 == xCell2) { for (int yCell = yCellMin; yCell <= yCellMax; yCell++) { xy[p++] = xOffset + xCell1; xy[p++] = yOffset + yCell; } } else if (yCell1 == yCell2) { for (int xCell = xCell1; xCell <= xCell2; xCell++) { xy[p++] = xOffset + xCell; xy[p++] = yOffset + yCell1; } } else { int xCell = xCell1; int yCell = yCell1;
double nx, ny; { double dx = x2 - x1; double dy = y2 - y1; double dist = Math.sqrt(dx * dx + dy * dy); nx = dx / dist; ny = dy / dist; }
final double advancePerCell = wCell / nx;
double firstStepRatio = (((xCell + 1) * wCell) - (double) x1) / wCell; double x = x1 + nx * advancePerCell * firstStepRatio; double y = y1 + ny * advancePerCell * firstStepRatio;
while (true) { if (ny > 0.0f) { for (int yEnd = Math.min((int) y / hCell - 1, yCell2); yCell <= yEnd; yCell++) { xy[p++] = xOffset + xCell; xy[p++] = yOffset + yCell; } } else { for (int yOff = Math.max((int) y / hCell - 0, yCell2); yCell > yOff; yCell--) { xy[p++] = xOffset + xCell; xy[p++] = yOffset + yCell; } }
if (x >= x2 || y <= yMin || y >= yMax) { break; }
x += nx * advancePerCell; y += ny * advancePerCell;
xy[p++] = xOffset + xCell++; xy[p++] = yOffset + yCell; }
if (p == 0 || xy[p - 2] != xOffset + xCell2 || xy[p - 1] != yOffset + yCell2) { xy[p++] = xOffset + xCell2; xy[p++] = yOffset + yCell2; } }
return p >> 1; }
public static final int plotReferenceImpl(int x1, int y1, int x2, int y2, int wCell, int hCell, int[] xy) { int xOffset = (-Math.min(0, Math.min(x1, x2)) + wCell - 1) / -wCell; int yOffset = (-Math.min(0, Math.min(y1, y2)) + hCell - 1) / -hCell; x1 -= xOffset * wCell; y1 -= yOffset * hCell; x2 -= xOffset * wCell; y2 -= yOffset * hCell; assert (x1 | y1 | x2 | y2) >= 0;
int p = 0;
int dist = Math.max(Math.abs(x2 - x1), Math.abs(y2 - y1)); if (dist == 0) { xy[p++] = xOffset + x1; xy[p++] = yOffset + x2; } else { float dx = (float) (x2 - x1) / dist; float dy = (float) (y2 - y1) / dist; int lastRegX = (int) (x1 + dx + 0.5f) / wCell; int lastRegY = (int) (y1 + dy + 0.5f) / hCell;
xy[p++] = xOffset + lastRegX; xy[p++] = yOffset + lastRegY;
for (int d = 2; d <= dist; d++) { int x = (int) (x1 + 0.5f + dx * d); int y = (int) (y1 + 0.5f + dy * d); int regX = x / wCell; int regY = y / hCell; if (regX != lastRegX || regY != lastRegY) { xy[p++] = xOffset + regX; xy[p++] = yOffset + regY; } lastRegX = regX; lastRegY = regY; } }
return p >> 1; } |