| 134 | } |
| 135 | |
| 136 | struct XForm |
| 137 | { |
| 138 | struct XFormComponent |
| 139 | { |
| 140 | XFormComponent() : m_val(0.0), m_auto(false) |
| 141 | {} |
| 142 | |
| 143 | XFormComponent(double val) : m_val(val), m_auto(false) |
| 144 | {} |
| 145 | |
| 146 | double m_val; |
| 147 | bool m_auto; |
| 148 | |
| 149 | bool set(const std::string& sval) |
| 150 | { |
| 151 | if (sval == "auto") |
| 152 | m_auto = true; |
| 153 | else |
| 154 | { |
| 155 | bool failed = false; |
| 156 | try |
| 157 | { |
| 158 | failed = !Utils::fromString(sval, m_val); |
| 159 | } |
| 160 | catch (...) |
| 161 | { |
| 162 | failed = true; |
| 163 | } |
| 164 | if (failed) |
| 165 | { |
| 166 | m_val = 0; |
| 167 | return false; |
| 168 | } |
| 169 | } |
| 170 | return true; |
| 171 | } |
| 172 | |
| 173 | friend std::istream& operator>>(std::istream& in, XFormComponent& xfc); |
| 174 | friend std::ostream& operator<<(std::ostream& in, |
| 175 | const XFormComponent& xfc); |
| 176 | }; |
| 177 | |
| 178 | XForm() : m_scale(1.0), m_offset(0.0) |
| 179 | {} |
| 180 | |
| 181 | XForm(double scale, double offset) : m_scale(scale), m_offset(offset) |
| 182 | {} |
| 183 | |
| 184 | // Scale component of the transform. |
| 185 | XFormComponent m_scale; |
| 186 | // Offset component of the transform. |
| 187 | XFormComponent m_offset; |
| 188 | |
| 189 | double toScaled(double val) const |
| 190 | { return (val - m_offset.m_val) / m_scale.m_val; } |
| 191 | |
| 192 | double fromScaled(double val) const |
| 193 | { return (val * m_scale.m_val) + m_offset.m_val; } |