1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.replica.replicaisland; 18 19 /** 20 * Adjusts the scroll position of a drawable object based on the camera's focus position. 21 * May be used to scroll a ScrollableBitmap or TiledWorld to match the camera. Uses DrawableFactory 22 * to allocate fire-and-forget drawable objects every frame. 23 */ 24 public class ScrollerComponent extends GameComponent { 25 private int mWidth; 26 private int mHeight; 27 private float mHalfWidth; 28 private float mHalfHeight; 29 private RenderComponent mRenderComponent; 30 private float mSpeedX; 31 private float mSpeedY; 32 private Texture mTexture; 33 private TiledVertexGrid mVertGrid; 34 ScrollerComponent(float speedX, float speedY, int width, int height, Texture texture)35 public ScrollerComponent(float speedX, float speedY, int width, int height, Texture texture) { 36 super(); 37 reset(); 38 setup(speedX, speedY, width, height); 39 setUseTexture(texture); 40 setPhase(ComponentPhases.PRE_DRAW.ordinal()); 41 } 42 ScrollerComponent(float speedX, float speedY, int width, int height, TiledVertexGrid grid)43 public ScrollerComponent(float speedX, float speedY, int width, int height, TiledVertexGrid grid) { 44 super(); 45 reset(); 46 setup(speedX, speedY, width, height); 47 mVertGrid = grid; 48 setPhase(ComponentPhases.PRE_DRAW.ordinal()); 49 } 50 ScrollerComponent()51 public ScrollerComponent() { 52 super(); 53 reset(); 54 setPhase(ComponentPhases.PRE_DRAW.ordinal()); 55 } 56 57 @Override reset()58 public void reset() { 59 mWidth = 0; 60 mHeight = 0; 61 mHalfWidth = 0.0f; 62 mHalfHeight = 0.0f; 63 mRenderComponent = null; 64 mSpeedX = 0.0f; 65 mSpeedY = 0.0f; 66 mTexture = null; 67 mVertGrid = null; 68 } 69 setScrollSpeed(float speedX, float speedY)70 public void setScrollSpeed(float speedX, float speedY) { 71 mSpeedX = speedX; 72 mSpeedY = speedY; 73 } 74 setup(float speedX, float speedY, int width, int height)75 public void setup(float speedX, float speedY, int width, int height) { 76 mSpeedX = speedX; 77 mSpeedY = speedY; 78 mWidth = width; 79 mHeight = height; 80 mHalfWidth = sSystemRegistry.contextParameters.gameWidth / 2.0f; //width / 2.0f; 81 mHalfHeight = sSystemRegistry.contextParameters.gameHeight / 2.0f; //height / 2.0f; 82 } 83 setUseTexture(Texture texture)84 public void setUseTexture(Texture texture) { 85 mTexture = texture; 86 } 87 88 @Override update(float timeDelta, BaseObject parent)89 public void update(float timeDelta, BaseObject parent) { 90 final DrawableFactory drawableFactory = sSystemRegistry.drawableFactory; 91 if (mRenderComponent != null && drawableFactory != null) { 92 ScrollableBitmap background; 93 if (mVertGrid != null) { 94 TiledBackgroundVertexGrid bg = drawableFactory.allocateTiledBackgroundVertexGrid(); 95 bg.setGrid(mVertGrid); 96 background = bg; 97 } else { 98 background = drawableFactory.allocateScrollableBitmap(); 99 background.setTexture(mTexture); 100 } 101 102 background.setWidth(mWidth); 103 background.setHeight(mHeight); 104 105 CameraSystem camera = sSystemRegistry.cameraSystem; 106 107 float originX = camera.getFocusPositionX() - mHalfWidth; 108 float originY = camera.getFocusPositionY() - mHalfHeight; 109 110 originX *= mSpeedX; 111 originY *= mSpeedY; 112 113 background.setScrollOrigin(originX, originY); 114 mRenderComponent.setDrawable(background); 115 } 116 } 117 setRenderComponent(RenderComponent render)118 public void setRenderComponent(RenderComponent render) { 119 mRenderComponent = render; 120 } 121 } 122