add tower builing game

public/tower_game-master/src/flight.js

@@ -0,0 +1,82 @@
+import { Instance } from 'cooljs'
+import * as constant from './constant'
+
+const getActionConfig = (engine, type) => {
+  const {
+    width, height, utils
+  } = engine
+  const { random } = utils
+  const size = engine.getVariable(constant.cloudSize)
+  const actionTypes = {
+    bottomToTop: {
+      x: width * random(0.3, 0.7),
+      y: height,
+      vx: 0,
+      vy: engine.pixelsPerFrame(height) * 0.7 * -1
+    },
+    leftToRight: {
+      x: size * -1,
+      y: height * random(0.3, 0.6),
+      vx: engine.pixelsPerFrame(width) * 0.4,
+      vy: engine.pixelsPerFrame(height) * 0.1 * -1
+    },
+    rightToLeft: {
+      x: width,
+      y: height * random(0.2, 0.5),
+      vx: engine.pixelsPerFrame(width) * 0.4 * -1,
+      vy: engine.pixelsPerFrame(height) * 0.1
+    },
+    rightTopToLeft: {
+      x: width,
+      y: 0,
+      vx: engine.pixelsPerFrame(width) * 0.6 * -1,
+      vy: engine.pixelsPerFrame(height) * 0.5
+    }
+  }
+  return actionTypes[type]
+}
+
+
+export const flightAction = (instance, engine) => {
+  const { visible, ready, type } = instance
+  if (!visible) return
+  const size = engine.getVariable(constant.cloudSize)
+  if (!ready) {
+    const action = getActionConfig(engine, type)
+    instance.ready = true
+    instance.width = size
+    instance.height = size
+    instance.x = action.x
+    instance.y = action.y
+    instance.vx = action.vx
+    instance.vy = action.vy
+  }
+  instance.x += instance.vx
+  instance.y += instance.vy
+  if (instance.y + size < 0
+    || instance.y > engine.height
+    || instance.x + size < 0
+    || instance.x > engine.width) {
+    instance.visible = false
+  }
+}
+
+export const flightPainter = (instance, engine) => {
+  const { ctx } = engine
+  const flight = engine.getImg(instance.imgName)
+  ctx.drawImage(flight, instance.x, instance.y, instance.width, instance.height)
+}
+
+export const addFlight = (engine, number, type) => {
+  const flightCount = engine.getVariable(constant.flightCount)
+  if (flightCount === number) return
+  const flight = new Instance({
+    name: `flight_${number}`,
+    action: flightAction,
+    painter: flightPainter
+  })
+  flight.imgName = `f${number}`
+  flight.type = type
+  engine.addInstance(flight, constant.flightLayer)
+  engine.setVariable(constant.flightCount, number)
+}