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1 /* |
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2 * Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Implementation of CHuiMatrixStack. CHuiMatrixStack is a stack |
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15 * of 2D transformation matrices. |
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16 * |
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17 */ |
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18 |
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19 |
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20 |
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21 #include "HuiMatrixStack.h" |
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22 #include "uiacceltk/HuiPanic.h" |
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23 |
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24 |
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25 EXPORT_C CHuiMatrixStack::TMatrix::TMatrix() |
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26 : iIsIdentity(ETrue) |
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27 { |
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28 // First column. |
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29 iMatrix[0] = 1; |
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30 iMatrix[1] = 0; |
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31 iMatrix[2] = 0; |
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32 |
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33 // Second column. |
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34 iMatrix[3] = 0; |
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35 iMatrix[4] = 1; |
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36 iMatrix[5] = 0; |
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37 |
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38 // Third column. |
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39 iMatrix[6] = 0; |
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40 iMatrix[7] = 0; |
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41 iMatrix[8] = 1; |
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42 } |
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43 |
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44 #define HUI_MATRIX_INDEX(aRow, aColumn) (aColumn*3 + aRow) |
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45 |
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46 void CHuiMatrixStack::TMatrix::Multiply(const TMatrix& aOther) |
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47 { |
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48 TMatrix result; |
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49 |
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50 // Clear the result. |
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51 Mem::FillZ(result.iMatrix, sizeof(result.iMatrix)); |
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52 |
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53 // It could still be an identity matrix, but probably not. |
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54 result.iIsIdentity = EFalse; |
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55 |
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56 for(TInt i = 0; i < 3; ++i) // Row. |
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57 { |
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58 for(TInt j = 0; j < 3; ++j) // Column. |
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59 { |
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60 for(TInt k = 0; k < 3; ++k) |
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61 { |
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62 result.iMatrix[ HUI_MATRIX_INDEX(i, j) ] += |
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63 iMatrix[ HUI_MATRIX_INDEX(i, k) ] * aOther.iMatrix[ HUI_MATRIX_INDEX(k, j) ]; |
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64 |
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65 } |
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66 } |
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67 } |
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68 |
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69 *this = result; |
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70 } |
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71 |
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72 |
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73 EXPORT_C void CHuiMatrixStack::TMatrix::Multiply(THuiRealPoint& aPoint) const |
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74 { |
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75 if(iIsIdentity) |
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76 { |
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77 // No need to do anything. |
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78 return; |
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79 } |
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80 |
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81 TReal32 wPoint[3] = |
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82 { |
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83 aPoint.iX, |
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84 aPoint.iY, |
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85 1.0f |
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86 }; |
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87 TReal32 result[3] = |
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88 { |
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89 0, 0, 0 |
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90 }; |
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91 |
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92 for(TInt i = 0; i < 3; ++i) |
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93 { |
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94 for(TInt j = 0; j < 3; ++j) |
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95 { |
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96 result[i] += wPoint[j] * iMatrix[ HUI_MATRIX_INDEX(i, j) ]; |
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97 } |
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98 } |
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99 |
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100 if(result[2] != 0) |
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101 { |
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102 // Normalize. |
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103 result[0] /= result[2]; |
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104 result[1] /= result[2]; |
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105 } |
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106 else |
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107 { |
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108 // Completely zero. |
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109 result[0] = 0; |
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110 result[1] = 0; |
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111 } |
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112 |
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113 aPoint.iX = result[0]; |
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114 aPoint.iY = result[1]; |
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115 } |
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116 |
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117 |
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118 EXPORT_C CHuiMatrixStack* CHuiMatrixStack::NewL() |
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119 { |
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120 CHuiMatrixStack* self = CHuiMatrixStack::NewLC(); |
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121 CleanupStack::Pop(self); |
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122 return self; |
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123 } |
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124 |
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125 |
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126 CHuiMatrixStack* CHuiMatrixStack::NewLC() |
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127 { |
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128 CHuiMatrixStack* self = new (ELeave) CHuiMatrixStack(); |
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129 CleanupStack::PushL(self); |
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130 self->ConstructL(); |
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131 return self; |
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132 } |
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133 |
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134 |
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135 CHuiMatrixStack::~CHuiMatrixStack() |
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136 { |
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137 iStack.Close(); |
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138 } |
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139 |
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140 |
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141 CHuiMatrixStack::CHuiMatrixStack() |
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142 { |
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143 } |
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144 |
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145 |
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146 void CHuiMatrixStack::ConstructL() |
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147 { |
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148 // Append one identity matrix as the default contents of the stack. |
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149 User::LeaveIfError( iStack.Append(TMatrix()) ); |
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150 } |
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151 |
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152 |
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153 EXPORT_C TInt CHuiMatrixStack::Count() const |
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154 { |
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155 return iStack.Count(); |
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156 } |
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157 |
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158 |
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159 EXPORT_C CHuiMatrixStack::TMatrix& CHuiMatrixStack::Current() |
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160 { |
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161 // There is always at least one matrix in the stack. |
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162 return iStack[iStack.Count() - 1]; |
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163 } |
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164 |
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165 |
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166 EXPORT_C TInt CHuiMatrixStack::Push() |
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167 { |
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168 // Make a copy of the topmost item. |
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169 return iStack.Append(Current()); |
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170 } |
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171 |
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172 |
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173 EXPORT_C void CHuiMatrixStack::Pop() |
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174 { |
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175 if(iStack.Count() <= 1) |
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176 { |
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177 // Invalid operation. |
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178 THuiPanic::Panic(THuiPanic::EMatrixStackPopFromEmpty); |
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179 } |
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180 |
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181 iStack.Remove(iStack.Count() - 1); |
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182 } |
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183 |
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184 |
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185 EXPORT_C void CHuiMatrixStack::LoadIdentity() |
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186 { |
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187 Current() = TMatrix(); |
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188 } |
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189 |
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190 |
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191 EXPORT_C void CHuiMatrixStack::Multiply(const TMatrix& aMatrix) |
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192 { |
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193 Current().Multiply(aMatrix); |
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194 } |