From 26ecd689c4b5c69c9916b66d3507098204621632 Mon Sep 17 00:00:00 2001
From: flykhan <liubo666666@outlook.com>
Date: Tue, 14 Feb 2023 18:36:01 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BB=98=E5=88=B6=E8=9B=87=E7=9C=BC?=
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---
 web/src/assets/scripts/Snake.js | 40 +++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/web/src/assets/scripts/Snake.js b/web/src/assets/scripts/Snake.js
index b2a7a0f..0dbf7f5 100644
--- a/web/src/assets/scripts/Snake.js
+++ b/web/src/assets/scripts/Snake.js
@@ -37,6 +37,27 @@ export class Snake extends AcGameObject {
 
         // 定义允许的误差: 0.01 ,当误差为 0.01 以内时,就认为两个点已经重合
         this.eps = 1e-2;
+
+        // 蛇头的眼睛方向:(默认)左下角蛇初始方向朝上
+        this.eye_direction = 0;
+        // 右上角蛇初始方向朝下
+        if (this.id === 1) this.eye_direction = 2;
+        // 蛇眼睛四方向x偏移量
+        this.eye_dx = [
+            [-1, 1],
+            [1, 1],
+            [1, -1],
+            [-1, -1],
+        ];
+
+        // 蛇眼睛四方向y偏移量
+        this.eye_dy = [
+            [-1, -1],
+            [-1, 1],
+            [1, 1],
+            [1, -1],
+        ];
+
     }
 
     start() {
@@ -65,6 +86,9 @@ export class Snake extends AcGameObject {
         // 下一节蛇身体的坐标计算
         this.next_cell = new Cell(this.cells[0].r + this.dr[d], this.cells[0].c + this.dc[d]);
         
+        // 更新蛇眼睛的方向:就是下一步的蛇头方向
+        this.eye_direction = d;
+
         // 计算完坐标之后,清空方向
         this.direction = -1;
         // 将状态从静止变为移动
@@ -192,5 +216,21 @@ export class Snake extends AcGameObject {
                 ctx.fillRect(Math.min(a.x, b.x) * L, (a.y - snake_node_width / 2) * L, Math.abs(a.x - b.x) * L, L * snake_node_width);
             }
         }
+
+        // 绘制蛇眼睛
+        // 定义眼睛颜色
+        ctx.fillStyle = "#fbff00";
+        // 定义蛇眼睛大小
+        const snake_eye_size = 0.07 * L;
+        // 画眼睛
+        for (let i = 0; i < 2; i ++) {
+            // 眼睛的横纵坐标(乘以 L 是绝对距离)
+            const eye_x = (this.cells[0].x + this.eye_dx[this.eye_direction][i] * 0.15) * L;
+            const eye_y = (this.cells[0].y + this.eye_dy[this.eye_direction][i] * 0.15) * L;
+            
+            ctx.beginPath()
+            ctx.arc(eye_x, eye_y, snake_eye_size, 0, 2 * Math.PI);
+            ctx.fill();
+        }
     }
 }
\ No newline at end of file