I used the hexagon code in this tutorial and created a createHex class (Should I post the code?). The linked web page has used the following code to actually draw the hexagons using the math in createHex:
@Override
public void paint(Graphics g){
for(int j = 0; int j < BOARD_HEIGHT; j++){
for(int i = 0; i < BOARD_HEIGHT; I++){
mCellMetrics.setCellIndex(i, j);
if(mCells[j][i] != 0){
mCellMetrics.computeCorners(mCornersX, mCornersY);
g.setColor((mCells[j][i] == L_ON) ? COLOR.ORANGE):COLOR.GRAY;
g.fillPolygon(mCornersX, mCornersY, NUM_HEX_CORNERS);
g.setColor(COLOR.BLACK)
g.drawPolygon(mCornersX, mCornersY, NUM_HEX_CORNERS);
}
}
}
}
The problem I encountered is that Android does not have a Graphics class that contains all the required methods. I did about an hour and a half of fishing around the android documentation and the closest thing I found was the Path class but it doesn't have the methods I need. I want to use the hexagon code in the linked article at the top but I can't find the equivalent of the graphics class. If there isn't an equivalent, can someone show me how to get the results I want using the linked code?
My question: How can I port the code in the linked article to android?
EDIT:
I decided that it might be helpful to others (and potential answerers) if I included the hexagon code that calculates the sides and whatnot of a hexagon, so here is createHex.java:
package com.rush;
/**
* Uniform hexagonal grid cell's metrics utility class.
*/
public class HexGridCell {
private static final int[] NEIGHBORS_DI = { 0, 1, 1, 0, -1, -1 };
private static final int[][] NEIGHBORS_DJ = {
{ -1, -1, 0, 1, 0, -1 }, { -1, 0, 1, 1, 1, 0 } };
private final int[] CORNERS_DX; // array of horizontal offsets of the cell's corners
private final int[] CORNERS_DY; // array of
vertical offsets of the cell's corners
private final int SIDE;
private int mX = 0; // cell's left coordinate
private int mY = 0; // cell's top coordinate
private int mI = 0; // cell's horizontal grid coordinate
private int mJ = 0; // cell's vertical grid coordinate
/**
* Cell radius (distance from center to one of the corners)
*/
public final int RADIUS;
/**
* Cell height
*/
public final int HEIGHT;
/**
* Cell width
*/
public final int WIDTH;
public static final int NUM_NEIGHBORS = 6;
/**
* @param radius Cell radius (distance from the center to one of the corners)
*/
public HexGridCell(int radius) {
RADIUS = radius;
WIDTH = radius * 2;
HEIGHT = (int) (((float) radius) * Math.sqrt(3));
SIDE = radius * 3 / 2;
int cdx[] = { RADIUS / 2, SIDE, WIDTH, SIDE, RADIUS / 2, 0 };
CORNERS_DX = cdx;
int cdy[] = { 0, 0, HEIGHT / 2, HEIGHT, HEIGHT, HEIGHT / 2 };
CORNERS_DY = cdy;
}
/**
* @return X coordinate of the cell's top left corner.
*/
public int getLeft() {
return mX;
}
/**
* @return Y coordinate of the cell's top left corner.
*/
public int getTop() {
return mY;
}
/**
* @return X coordinate of the cell's center
*/
public int getCenterX() {
return mX + RADIUS;
}
/**
* @return Y coordinate of the cell's center
*/
public int getCenterY() {
return mY + HEIGHT / 2;
}
/**
* @return Horizontal grid coordinate for the cell.
*/
public int getIndexI() {
return mI;
}
/**
* @return Vertical grid coordinate for the cell.
*/
public int getIndexJ() {
return mJ;
}
/**
* @return Horizontal grid coordinate for the given neighbor.
*/
public int getNeighborI(int neighborIdx) {
return mI + NEIGHBORS_DI[neighborIdx];
}
/**
* @return Vertical grid coordinate for the given neighbor.
*/
public int getNeighborJ(int neighborIdx) {
return mJ + NEIGHBORS_DJ[mI % 2][neighborIdx];
}
/**
* Computes X and Y coordinates for all of the cell's 6 corners, clockwise,
* starting from the top left.
*
* @param cornersX Array to fill in with X coordinates of the cell's corners
* @param cornersX Array to fill in with Y coordinates of the cell's corners
*/
public void computeCorners(int[] cornersX, int[] cornersY) {
for (int k = 0; k < NUM_NEIGHBORS; k++) {
cornersX[k] = mX + CORNERS_DX[k];
cornersY[k] = mY + CORNERS_DY[k];
}
}
/**
* Sets the cell's horizontal and vertical grid coordinates.
*/
public void setCellIndex(int i, int j) {
mI = i;
mJ = j;
mX = i * SIDE;
mY = HEIGHT * (2 * j + (i % 2)) / 2;
}
/**
* Sets the cell as corresponding to some point inside it (can be used for
* e.g. mouse picking).
*/
public void setCellByPoint(int x, int y) {
int ci = (int)Math.floor((float)x/(float)SIDE);
int cx = x - SIDE*ci;
int ty = y - (ci % 2) * HEIGHT / 2;
int cj = (int)Math.floor((float)ty/(float)HEIGHT);
int cy = ty - HEIGHT*cj;
if (cx > Math.abs(RADIUS / 2 - RADIUS * cy / HEIGHT)) {
setCellIndex(ci, cj);
} else {
setCellIndex(ci - 1, cj + (ci % 2) - ((cy < HEIGHT / 2) ? 1 :
0));
}
}
}
For an explanation of how the code works please refer to the linked article.
