0. 學習來源

沒想到教學視頻就只講到這里，視頻來源是傳智播客之植物大戰僵尸Android開發教程+課件+源碼
作者是侯哥，非常nice，視頻是很早的，當時還是用Eclipse編寫的，雖然現在是AndroidStudio

1. 碰撞監測

僵尸遇到向日葵和豌豆射手，吃掉對應的植物

2. 思路

僵尸和植物相當于2個矩形相交

// 矩形的碰撞監測算法private boolean isCollision(BaseModel model1, BaseModel model2) {boolean result = false;// 矩形的中心線int modelMiddleLine1 = model1.locationX + model1.getModelWidth() / 2;// 矩形的中心線int modelMiddleLine2 = model2.locationX + model2.getModelWidth() / 2;// 中心線差int diff = Math.abs(modelMiddleLine1 - modelMiddleLine2);// 矩形寬和的一般作為標準線int stander = (model1.getModelWidth() + model2.getModelWidth()) / 2;if (diff < stander) {result = true;}return result;}

3. 開發

讓僵尸進行碰撞監測，因為僵尸可以吃向日葵，豌豆射手，省事些，如果想向日葵和豌豆射手監測的話，要寫2遍

package com.su.botanywarzombies.entity;/*** 僵尸類*/ public class Zombie extends BaseModel {@Overridepublic void drawSelf(Canvas canvas, Paint paint) {if (isLive) {canvas.drawBitmap(Config.zombieFlames[farmeIndex], locationX, locationY, paint);farmeIndex = (++farmeIndex) % 7;locationX = locationX - seepX;if (locationX < 0) {isLive = false;}// 僵尸發起碰撞監測GameView.getInstance().checkCollision(this, raceWay);}}

碰撞監測

// 僵尸發起碰撞監測public void checkCollision(Zombie zombie, int raceWay) {synchronized (mSurfaceHolder) {switch (raceWay) {case 0:for (BaseModel model : gameLayout4plant0) {// 兩個矩形的碰撞監測if (isCollision(model, zombie)) {if (model instanceof Plant) {// 僵尸碰到植物，則植物死了model.isLive = false;} else {// 子彈射擊僵尸，則僵尸死亡zombie.isLive = false;}}}break;case 1:for (BaseModel model : gameLayout4plant1) {// 兩個矩形的碰撞監測if (isCollision(model, zombie)) {if (model instanceof Plant) {// 僵尸碰到植物，則植物死了model.isLive = false;} else {// 子彈射擊僵尸，則僵尸死亡zombie.isLive = false;}}}break;case 2:for (BaseModel model : gameLayout4plant2) {// 兩個矩形的碰撞監測if (isCollision(model, zombie)) {if (model instanceof Plant) {// 僵尸碰到植物，則植物死了model.isLive = false;} else {// 子彈射擊僵尸，則僵尸死亡zombie.isLive = false;}}}break;case 3:for (BaseModel model : gameLayout4plant3) {// 兩個矩形的碰撞監測if (isCollision(model, zombie)) {if (model instanceof Plant) {// 僵尸碰到植物，則植物死了model.isLive = false;} else {// 子彈射擊僵尸，則僵尸死亡zombie.isLive = false;}}}break;case 4:for (BaseModel model : gameLayout4plant4) {// 兩個矩形的碰撞監測if (isCollision(model, zombie)) {if (model instanceof Plant) {// 僵尸碰到植物，則植物死了model.isLive = false;} else {// 子彈射擊僵尸，則僵尸死亡zombie.isLive = false;}}}break;default:break;}}}// 矩形的碰撞監測算法private boolean isCollision(BaseModel model1, BaseModel model2) {boolean result = false;// 矩形的中心線int modelMiddleLine1 = model1.locationX + model1.getModelWidth() / 2;// 矩形的中心線int modelMiddleLine2 = model2.locationX + model2.getModelWidth() / 2;// 中心線差int diff = Math.abs(modelMiddleLine1 - modelMiddleLine2);// 矩形寬和的一般作為標準線int stander = (model1.getModelWidth() + model2.getModelWidth()) / 2;if (diff < stander) {result = true;}return result;}

4. Demo下載

https://github.com/sufadi/BotanyWarZombies

總結

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