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BoardView for the Tic-Tac-Toe game on the SSaurel's Blog
package com.ssaurel.tictactoe;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class BoardView extends View {
private static final int LINE_THICK = 5;
private static final int ELT_MARGIN = 20;
private static final int ELT_STROKE_WIDTH = 15;
private int width, height, eltW, eltH;
private Paint gridPaint, oPaint, xPaint;
private GameEngine gameEngine;
private MainActivity activity;
public BoardView(Context context) {
super(context);
}
public BoardView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
gridPaint = new Paint();
oPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
oPaint.setColor(Color.RED);
oPaint.setStyle(Paint.Style.STROKE);
oPaint.setStrokeWidth(ELT_STROKE_WIDTH);
xPaint = new Paint(oPaint);
xPaint.setColor(Color.BLUE);
}
public void setMainActivity(MainActivity a) {
activity = a;
}
public void setGameEngine(GameEngine g) {
gameEngine = g;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
height = View.MeasureSpec.getSize(heightMeasureSpec);
width = View.MeasureSpec.getSize(widthMeasureSpec);
eltW = (width - LINE_THICK) / 3;
eltH = (height - LINE_THICK) / 3;
setMeasuredDimension(width, height);
}
@Override
protected void onDraw(Canvas canvas) {
drawGrid(canvas);
drawBoard(canvas);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!gameEngine.isEnded() && event.getAction() == MotionEvent.ACTION_DOWN) {
int x = (int) (event.getX() / eltW);
int y = (int) (event.getY() / eltH);
char win = gameEngine.play(x, y);
invalidate();
if (win != ' ') {
activity.gameEnded(win);
} else {
// computer plays ...
win = gameEngine.computer();
invalidate();
if (win != ' ') {
activity.gameEnded(win);
}
}
}
return super.onTouchEvent(event);
}
private void drawBoard(Canvas canvas) {
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
drawElt(canvas, gameEngine.elt(i, j), i, j);
}
}
}
private void drawGrid(Canvas canvas) {
for (int i = 0; i < 2; i++) {
// vertical lines
float left = eltW * (i + 1);
float right = left + LINE_THICK;
float top = 0;
float bottom = height;
canvas.drawRect(left, top, right, bottom, gridPaint);
// horizontal lines
float left2 = 0;
float right2 = width;
float top2 = eltH * (i + 1);
float bottom2 = top2 + LINE_THICK;
canvas.drawRect(left2, top2, right2, bottom2, gridPaint);
}
}
private void drawElt(Canvas canvas, char c, int x, int y) {
if (c == 'O') {
float cx = (eltW * x) + eltW / 2;
float cy = (eltH * y) + eltH / 2;
canvas.drawCircle(cx, cy, Math.min(eltW, eltH) / 2 - ELT_MARGIN * 2, oPaint);
} else if (c == 'X') {
float startX = (eltW * x) + ELT_MARGIN;
float startY = (eltH * y) + ELT_MARGIN;
float endX = startX + eltW - ELT_MARGIN * 2;
float endY = startY + eltH - ELT_MARGIN;
canvas.drawLine(startX, startY, endX, endY, xPaint);
float startX2 = (eltW * (x + 1)) - ELT_MARGIN;
float startY2 = (eltH * y) + ELT_MARGIN;
float endX2 = startX2 - eltW + ELT_MARGIN * 2;
float endY2 = startY2 + eltH - ELT_MARGIN;
canvas.drawLine(startX2, startY2, endX2, endY2, xPaint);
}
}
}
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