sky/examples/game/lib/game_world.dart - Issue 1179333002: Playable demo game and bug fixes in sprites

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Issue 1179333002: Playable demo game and bug fixes in sprites (Closed) Base URL: git@github.com:domokit/mojo.git@master

Patch Set: Created 5 years, 6 months ago

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	(Empty)
1 part of game;

2

3 class GameWorld extends Node {

4

5 World world;

6 List<Body> bodies = [];

7 Body _bodyShip;

8

9 Image _imgBg;

10 Image _imgAsteroid;

11 Image _imgShip;

12

13 double _steeringInput;

14 double _thrustInput;

15 double _lastSteeringSpeed = 0.0;

16

17 GameWorld(ImageMap images) {

18 this.width = 1024.0;

19 this.height = 1024.0;

20

21 // Fetch images

22 _imgBg = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian .spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/Burn Texture.png"];

23 _imgAsteroid = images["https://raw.githubusercontent.com/slembcke/GalacticGu ardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resou rces-auto/asteroid_big_002.png"];

24 _imgShip = images["https://raw.githubusercontent.com/slembcke/GalacticGuardi an.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources -auto/GG_blueship_Lv3.png"];

25

26 // Create the physics world

27 world = new World.withGravity(new Vector2(0.0, 0.0));

28

29 // Add a background

30 addBackground();

31

32 // Add some asteroids to the game world

33 for (int i = 0; i < 50; i++) {

34 addAsteroid(10.0);

35 }

36 for (int i = 0; i < 50; i++) {

37 addAsteroid(20.0);

38 }

39

40 // Add ship

41 addShip();

42 }

43

44 void addBackground() {

45 Sprite sprtBg = new Sprite.withImage(_imgBg);

46 sprtBg.width = width;

47 sprtBg.height = height;

48 sprtBg.pivot = new Vector2(0.0, 0.0);

49 this.addChild(sprtBg);

50 }

51

52 void addAsteroid([double radius=20.0]) {

53

54 // Create shape

55 final CircleShape shape = new CircleShape();

56 shape.radius = radius;

57

58 // Define fixture (links body and shape)

59 final FixtureDef activeFixtureDef = new FixtureDef();

60 activeFixtureDef.restitution = 1.0;

61 activeFixtureDef.density = 0.05;

62 activeFixtureDef.shape = shape;

63

64 // Define body

65 final BodyDef bodyDef = new BodyDef();

66 bodyDef.type = BodyType.DYNAMIC;

67 bodyDef.position = new Vector2(0.0, 30.0);

68 bodyDef.linearDamping = 0.0;

69 bodyDef.angularDamping = 0.0;

70

71 // Create body and fixture from definitions

72 final Body body = world.createBody(bodyDef);

73 body.createFixtureFromFixtureDef(activeFixtureDef);

74

75 // Set position of object

76 Math.Random rand = new Math.Random();

77 body.setTransform(new Vector2(rand.nextDouble() * this.width, rand.nextDoubl e() * this.height), 0.0);

78 body.applyLinearImpulse(new Vector2(rand.nextDouble()10000.0-5000.0, rand.n extDouble()10000.0-5000.0), new Vector2(0.0, 0.0), true);

79

80 // Add to list

81 bodies.add(body);

82

83 // Create sprite

84 Sprite sprt = new Sprite.withImage(_imgAsteroid);

85 sprt.width = radius*2;

86 sprt.height = radius*2;

87 // sprt.colorOverlay = new Color(0x33ff0000);

88 // sprt.transferMode = TransferMode.plusMode;

89 body.userData = sprt;

90 this.addChild(sprt);

91 }

92

93 void addShip() {

94 double radius = 30.0;

95

96 // Create shape

97 final CircleShape shape = new CircleShape();

98 shape.radius = radius;

99

100 // Define fixture (links body and shape)

101 final FixtureDef activeFixtureDef = new FixtureDef();

102 activeFixtureDef.restitution = 1.0;

103 activeFixtureDef.density = 0.05;

104 activeFixtureDef.shape = shape;

105

106 // Define body

107 final BodyDef bodyDef = new BodyDef();

108 bodyDef.type = BodyType.DYNAMIC;

109 bodyDef.position = new Vector2(0.0, 30.0);

110 bodyDef.linearDamping = 0.0;

111 bodyDef.angularDamping = 0.95;

112

113 // Create body and fixture from definitions

114 final Body body = world.createBody(bodyDef);

115 body.createFixtureFromFixtureDef(activeFixtureDef);

116

117 // Center on screen

118 body.setTransform(new Vector2(width/2.0, height/2.0), 90.0);

119

120 // Add to list

121 bodies.add(body);

122 _bodyShip = body;

123

124 // Create sprite

125 Sprite sprt = new Sprite.withImage(_imgShip);

126 sprt.width = radius*2;

127 sprt.height = radius*2;

128 sprt.position = new Vector2(width/2.0, height/2.0);

129 body.userData = sprt;

130 this.addChild(sprt);

131 }

132

133 void update(double dt) {

134 // Apply thrust

135 if (_thrustInput != null) {

136 double force = _thrustInput*10000.0;

137 double rad = degrees2radians(_bodyShip.getAngle());

138 _bodyShip.applyLinearImpulse(new Vector2(Math.cos(rad)force, Math.sin(rad )force), new Vector2(0.0, 0.0), true);

139 }

140

141 // Simulate world

142 world.stepDt(1.0/60.0, 10, 10); // Pass in dt

143

144 // Apply stearing

145 if (_steeringInput != null) {

146 _lastSteeringSpeed = _steeringInput * 4.0;

147 }

148 else {

149 _lastSteeringSpeed *= 0.75;

150 }

151 _bodyShip.setTransform(_bodyShip.position, _bodyShip.getAngle() + _lastSteer ingSpeed);

152

153 // Update all sprites

154 bodies.forEach(updateBody);

155 }

156

157 void updateBody(Body body) {

158 Sprite sprt = body.userData;

159 double rot = 0.0; //body.getRotation();

160

161 // Check bounds and warp objects

162 if (body.position[0] < -sprt.width/2) {

163 body.setTransform(new Vector2(body.position[0] + this.width + sprt.width, body.position[1]), rot);

164 }

165 if (body.position[0] > this.width + sprt.width/2) {

166 body.setTransform(new Vector2(body.position[0] - (this.width + sprt.width) , body.position[1]), rot);

167 }

168 if (body.position[1] < -sprt.height/2) {

169 body.setTransform(new Vector2(body.position[0], body.position[1] + this.he ight + sprt.height), rot);

170 }

171 if (body.position[1] > this.height + sprt.height/2) {

172 body.setTransform(new Vector2(body.position[0], body.position[1] - (this.h eight + sprt.height)), rot);

173 }

174

175 // Update sprite

176 sprt.position = body.position;

177 sprt.rotation = body.getAngle();

178 }

179

180 void controlSteering(double input) {

181 _steeringInput = input;

182 }

183

184 void controlThrust(double input) {

185 _thrustInput = input;

186 }

187

188 void controlFire() {

189

190 }

191 }

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