## root / scout / libscout / src / behaviors / line_follow.cpp @ c840fbe6

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1 | 9143e077 | Lalitha Ganesan | ```
/**
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2 | 58371433 | Priya | ```
* Copyright (c) 2011 Colony Project
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3 | ```
*
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4 | ```
* Permission is hereby granted, free of charge, to any person
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5 | ```
* obtaining a copy of this software and associated documentation
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6 | ```
* files (the "Software"), to deal in the Software without
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7 | ```
* restriction, including without limitation the rights to use,
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8 | ```
* copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | ```
* copies of the Software, and to permit persons to whom the
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10 | ```
* Software is furnished to do so, subject to the following
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11 | ```
* conditions:
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12 | ```
*
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13 | ```
* The above copyright notice and this permission notice shall be
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14 | ```
* included in all copies or substantial portions of the Software.
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15 | ```
*
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16 | ```
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 | ```
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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18 | ```
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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19 | ```
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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20 | ```
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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21 | ```
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 | ```
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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23 | ```
* OTHER DEALINGS IN THE SOFTWARE.
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24 | 9143e077 | Lalitha Ganesan | ```
*/
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25 | |||

26 | 60b98383 | Priya | #include "line_follow.h" |

27 | 9143e077 | Lalitha Ganesan | |

28 | 58371433 | Priya | using namespace std; |

29 | 9143e077 | Lalitha Ganesan | |

30 | 58371433 | Priya | static int motor_l; |

31 | static int motor_r; |
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32 | 9143e077 | Lalitha Ganesan | |

33 | c840fbe6 | Priya | Duration init_turn_time(1.5); |

34 | afa9104d | Priya | |

35 | 58371433 | Priya | ```
void line_follow::follow_line()
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36 | { |
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37 | afa9104d | Priya | ```
do
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38 | 58371433 | Priya | { |

39 | ```
double line_loc = linesensor->readline();
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40 | 9143e077 | Lalitha Ganesan | |

41 | 6fab3966 | Alex | motor_l = min(max((int) (-MOTOR_BASE + SCALE * line_loc), -128), 127); |

42 | motor_r = min(max((int) (-MOTOR_BASE - SCALE * line_loc), -128), 127); |
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43 | 9143e077 | Lalitha Ganesan | |

44 | 58371433 | Priya | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |

45 | } |
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46 | afa9104d | Priya | ```
while(!linesensor->fullline());
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47 | 58371433 | Priya | halt(); |

48 | 1905324e | Priya | ```
ROS_INFO("Intersection reached!");
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49 | 58371433 | Priya | } |

50 | 9143e077 | Lalitha Ganesan | |

51 | afa9104d | Priya | ```
void line_follow::turn_straight()
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52 | { |
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53 | ```
do
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54 | { |
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55 | motor_l = -MOTOR_BASE; |
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56 | motor_r = -MOTOR_BASE; |
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57 | |||

58 | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |
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59 | } |
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60 | ```
while(linesensor->fullline());
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61 | } |
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62 | |||

63 | 58371433 | Priya | ```
void line_follow::turn_left()
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64 | 60b98383 | Priya | { |

65 | 58371433 | Priya | bool first = true; |

66 | afa9104d | Priya | ```
float line_loc;
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67 | 58371433 | Priya | ```
do
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68 | { |
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69 | motor_l = -MOTOR_BASE; |
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70 | c840fbe6 | Priya | motor_r = 3*MOTOR_BASE/5; |

71 | 60b98383 | Priya | |

72 | 58371433 | Priya | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |

73 | 60b98383 | Priya | |

74 | 58371433 | Priya | ```
if(first)
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75 | 9143e077 | Lalitha Ganesan | { |

76 | afa9104d | Priya | init_turn_time.sleep(); |

77 | 58371433 | Priya | ```
first = false;
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78 | 9143e077 | Lalitha Ganesan | } |

79 | afa9104d | Priya | |

80 | line_loc = linesensor->readline(); |
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81 | 60b98383 | Priya | } |

82 | 58c19c15 | Priya | while(!(-1 < line_loc && line_loc < 1)); |

83 | 9143e077 | Lalitha Ganesan | } |

84 | |||

85 | 58371433 | Priya | ```
void line_follow::halt()
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86 | 9143e077 | Lalitha Ganesan | { |

87 | 58371433 | Priya | motors->set_sides(0, 0, MOTOR_ABSOLUTE); |

88 | 9143e077 | Lalitha Ganesan | } |

89 | |||

90 | afa9104d | Priya | ```
void line_follow::spot_turn()
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91 | { |
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92 | bool first = true; |
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93 | ```
float line_loc;
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94 | ```
do
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95 | { |
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96 | motor_l = MOTOR_BASE; |
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97 | motor_r = -MOTOR_BASE; |
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98 | |||

99 | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |
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100 | |||

101 | ```
if(first)
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102 | { |
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103 | c840fbe6 | Priya | ```
do
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104 | { |
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105 | afa9104d | Priya | line_loc = linesensor->readline(); |

106 | c840fbe6 | Priya | } |

107 | while(line_loc < 2 && line_loc > -2); |
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108 | afa9104d | Priya | |

109 | ```
first = false;
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110 | } |
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111 | line_loc = linesensor->readline(); |
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112 | } |
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113 | while(!(-1 < line_loc && line_loc < 1)); |
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114 | } |
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115 | |||

116 | 58371433 | Priya | ```
void line_follow::turn_right()
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117 | 9143e077 | Lalitha Ganesan | { |

118 | 58371433 | Priya | bool first = true; |

119 | afa9104d | Priya | ```
float line_loc;
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120 | 58371433 | Priya | ```
do
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121 | { |
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122 | c840fbe6 | Priya | motor_l = 3*MOTOR_BASE/5; |

123 | 58371433 | Priya | motor_r = -MOTOR_BASE; |

124 | 60b98383 | Priya | |

125 | 58371433 | Priya | motors->set_sides(motor_l, motor_r, MOTOR_ABSOLUTE); |

126 | 60b98383 | Priya | |

127 | 58371433 | Priya | ```
if(first)
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128 | 60b98383 | Priya | { |

129 | afa9104d | Priya | init_turn_time.sleep(); |

130 | 58371433 | Priya | ```
first = false;
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131 | 60b98383 | Priya | } |

132 | afa9104d | Priya | |

133 | line_loc = linesensor->readline(); |
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134 | 60b98383 | Priya | } |

135 | afa9104d | Priya | while(!(-1 < line_loc && line_loc < 1)); |

136 | 9143e077 | Lalitha Ganesan | } |

137 | |||

138 | 1905324e | Priya | ```
void line_follow::u_turn()
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139 | 9143e077 | Lalitha Ganesan | { |

140 | 1905324e | Priya | turn_right(); |

141 | 58371433 | Priya | follow_line(); |

142 | turn_right(); |
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143 | 1905324e | Priya | } |

144 | |||

145 | ```
void line_follow::run()
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146 | { |
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147 | 25694a03 | Priya | ```
while(ok())
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148 | { |
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149 | follow_line(); |
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150 | } |
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151 | 9143e077 | Lalitha Ganesan | } |