Collision Detection help frequently used in games

Collision Detection is often used in games. General game engines also carry their own collision detection classes, but sometimes they are not flexible. At this time, we hope we can customize some collision detection classes. Top Tong...

1. Import Android. Graphics. rect;
   

2. 
   

3. Public class collisionutil {
   

4. /**
   

5. * The rectangle collision detection parameter is X, Y, width, and height.
   

6. *
   

7. * @ Param X1
   

8. * X of the first rectangle
   

9. * @ Param Y1
   

10. * Y of the first rectangle
    

11. * @ Param W1
    

12. * W of the first rectangle
    

13. * @ Param H1
    

14. * H of the first rectangle
    

15. * @ Param X2
    

16. * X of the second rectangle
    

17. * @ Param Y2
    

18. * Y of the second rectangle
    

19. * @ Param W2
    

20. * W of the second rectangle
    

21. * @ Param H2
    

22. * H of the second rectangle
    

23. * [Url = home. php? MoD = Space & uid = 7300] @ return [/url] collision?
    

24. */
    

25. Public static Boolean isrectcollision (float X1, float Y1, float W1,
    

26. Float H1, float X2, float Y2, float W2, float H2 ){
    

27. If (X2> X1 & X2> X1 + W1 ){
    

28. Return false;
    

29. } Else if (X2 <X1 & X2 <x1-W2 ){
    

30. Return false;
    

31. } Else if (Y2> Y1 & Y2> Y1 + H1 ){
    

32. Return false;
    

33. } Else if (Y2 <Y1 & Y2 <Y1-H2 ){
    

34. Return false;
    

35. } Else {
    

36. Return true;
    

37. }
    

38. }
    

39. 
    

40. /**
    

41. * The rectangle collision detection parameter is a rect object.
    

42. *
    

43. * @ Param r1
    

44. * The first rect object
    

45. * @ Param r2
    

46. * Second rect object
    

47. * @ Return collision?
    

48. */
    

49. Public static Boolean isrectcollision (rect R1, rect R2 ){
    

50. Return isrectcollision (r1.left, r1.top, r1.right-r1.left, r1.bottom
    

51. -R1.top, r2.left, r2.top, r2.right-r2.left, r2.bottom
    

52. -R2.top );
    

53. }
    

54. 
    

55. /**
    

56. * Round Collision Detection
    

57. *
    

58. * @ Param X1
    

59. * The center of the first circle X
    

60. * @ Param Y1
    

61. * Y of the center of the first circle
    

62. * @ Param r1
    

63. * Radius of the first circle
    

64. * @ Param X2
    

65. * The center of the second circle X
    

66. * @ Param Y2
    

67. * Y of the center of the second circle
    

68. * @ Param r2
    

69. * Radius of the second circle
    

70. * @ Return collision?
    

71. */
    

72. Public static Boolean iscirclecollision (INT X1, int Y1, int R1, int X2,
    

73. Int Y2, int R2 ){
    

74. // The distance between the two points and the radius of the circle is greater than 2
    

75. If (math. SQRT (math. Pow (x1-X2, 2) + math. Pow (Y1-Y2, 2)> R1 + R2 ){
    

76. Return false;
    

77. }
    

78. Return true;
    

79. }
    

80. 
    

81. /**
    

82. * Circular and rectangular Collision Detection
    

83. *
    

84. * @ Param X1
    

85. * X of the first rectangle
    

86. * @ Param Y1
    

87. * Y of the first rectangle
    

88. * @ Param W1
    

89. * Width of the first rectangle
    

90. * @ Param H1
    

91. * Height of the first rectangle
    

92. * @ Param X2
    

93. * Circle center x
    

94. * @ Param Y2
    

95. * Circle center y
    

96. * @ Param r2
    

97. * Circle radius R
    

98. * @ Return collision?
    

99. */
    

100. Public static Boolean isc2rcollision (INT X1, int Y1, int W1, int H1,
     

101. Int X2, int Y2, int R2 ){
     

102. If (math. Abs (x2-(X1 + W1/2)> W1/2 + R2)
     

103. | Math. Abs (Y2-(Y1 + H1/2)> H1/2 + R2 ){
     

104. Return false;
     

105. }
     

106. Return true;
     

107. }
     

108. 
     

109. /**
     

110. * Multi-rectangle collision
     

111. *
     

112. * @ Param rarray1
     

113. * @ Param rarray2
     

114. * @ Return collision?
     

115. */
     

116. Public static Boolean isrectscollision (rect [] rarray1, rect [] rarray2 ){
     

117. For (rect rt1: rarray1 ){
     

118. For (rect rt2: rarray2 ){
     

119. If (isrectcollision (rt1, rt2 )){
     

120. Return true;
     

121. }
     

122. }
     

123. }
     

124. Return false;
     

125. }
     

126. 
     

127. }
     

128. 
     

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