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1 // Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include <bitstd.h> |
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17 #include <bitdev.h> |
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18 #include "BITPANIC.H" |
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19 #include <bitdraw.h> |
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20 #include <graphics/fbsrasterizer.h> |
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21 |
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22 /* |
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23 * TEllipse |
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24 */ |
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25 |
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26 /** |
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27 Initialises the values of the ellipse so that it conforms to a rectangle entered as a parameter. |
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28 @param aRect the rectangle within which the ellipse is drawn |
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29 */ |
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30 EXPORT_C void TEllipse::Construct(const TRect& aRect) |
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31 { |
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32 TInt width=aRect.Width(); |
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33 TInt height=aRect.Height(); |
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34 iA=(width-1)>>1; |
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35 iB=(height-1)>>1; |
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36 iXAdj=(width+1)&1; |
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37 iYAdj=(height+1)&1; |
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38 iOffset=aRect.iTl; |
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39 iX=0; |
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40 iY=iB; |
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41 iASquared=iA*iA; |
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42 iBSquared=iB*iB; |
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43 iASquBSqu=iASquared*iBSquared; |
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44 iD1=iBSquared-iASquared*iB+(iASquared>>1); |
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45 if(width<=0 || height<=0) |
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46 iStatus=EComplete; |
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47 else if(width<=2 || height<=2) |
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48 iStatus=ELine; |
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49 else if(iA+iXAdj==0 || iB+iYAdj==0) |
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50 iStatus=EComplete; |
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51 else |
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52 iStatus=EInitialised; |
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53 } |
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54 |
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55 /** |
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56 Does the next stage in producing an ellipse by taking four points (the corners of |
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57 the rectangle the ellipse should fill) as parameters. Updates TEllipse status |
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58 accordingly and calls <code>Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight)</code>. |
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59 @param aTopLeft Top left corner of rectangle |
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60 @param aTopRight Top right corner of rectangle |
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61 @param aBottomLeft Bottom left corner of rectangle |
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62 @param aBottomRight Bottom right corner of rectangle |
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63 @return TBool ETrue if step completed successfully. |
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64 */ |
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65 EXPORT_C TBool TEllipse::SingleStep(TPoint& aTopLeft,TPoint& aTopRight, |
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66 TPoint& aBottomLeft,TPoint& aBottomRight) |
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67 { |
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68 TBool ret=EFalse; |
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69 if(iStatus==EFirstSector) |
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70 { |
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71 if(iD1<0) |
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72 iD1+=iBSquared*((iX<<1)+3); |
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73 else if(iY>0) |
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74 { |
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75 iD1+=iBSquared*((iX<<1)+3)+iASquared*(2-(iY<<1)); |
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76 iY--; |
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77 } |
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78 iX++; |
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79 ret=Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight); |
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80 if(iStatus==EComplete && iX<iA) |
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81 { |
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82 iStatus=EFirstSector; |
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83 return(EFalse); |
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84 } |
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85 if(iASquared*iY<=iBSquared*(iX+1) && ret==EFalse) |
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86 { |
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87 iStatus=ESecondSector; |
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88 iD2=-iASquBSqu+iBSquared*iX*iX+iASquared*(iY-1)*(iY-1); |
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89 } |
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90 return(ret); |
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91 } |
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92 if(iStatus==ESecondSector) |
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93 { |
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94 if(iD2<0) |
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95 { |
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96 iD2+=iBSquared*((iX<<1)+2)+iASquared*(3-(iY<<1)); |
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97 iX++; |
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98 } |
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99 else |
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100 iD2+=iASquared*(3-(iY<<1)); |
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101 iY--; |
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102 return(Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight)); |
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103 } |
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104 if(iStatus==ELine) |
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105 { |
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106 ret=Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight); |
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107 if(iA==0) |
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108 iY--; |
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109 else |
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110 { |
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111 iX++; |
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112 if(iX>iA+iXAdj) ret=ETrue; |
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113 else |
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114 { |
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115 iStatus=ELine; |
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116 ret=EFalse; |
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117 } |
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118 } |
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119 return(ret); |
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120 } |
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121 if(iStatus==EInitialised) |
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122 { |
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123 iStatus=EFirstSector; |
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124 return(Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight)); |
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125 } |
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126 Output(aTopLeft,aTopRight,aBottomLeft,aBottomRight); |
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127 return(ETrue); |
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128 } |
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129 |
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130 /** |
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131 Sets the absolute points that define the ellipse as calculated using its iOffset |
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132 from the origin and using the half width and half height of the rectangle iA and iB. |
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133 @param aTopLeft The absolute (x,y) position for the top left point. |
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134 @param aTopRight The absolute (x,y) position for the top right point. |
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135 @param aBottomLeft The absolute (x,y) position for the bottom left point. |
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136 @param aBottomRight The absolute (x,y) position for the bottom right point. |
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137 @return TBool ETrue if a valid rectangle is produced, else EFalse. Also sets |
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138 iStatus to EComplete. |
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139 */ |
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140 EXPORT_C TBool TEllipse::Output(TPoint& aTopLeft,TPoint& aTopRight, |
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141 TPoint& aBottomLeft,TPoint& aBottomRight) |
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142 { |
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143 TInt lx=iA-iX+iOffset.iX; |
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144 TInt ty=iB-iY+iOffset.iY; |
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145 TInt rx=iA+iX+iXAdj+iOffset.iX; |
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146 TInt by=iB+iY+iYAdj+iOffset.iY; |
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147 aTopLeft.SetXY(lx,ty); |
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148 aTopRight.SetXY(rx,ty); |
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149 aBottomLeft.SetXY(lx,by); |
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150 aBottomRight.SetXY(rx,by); |
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151 if(iY<=0) |
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152 { |
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153 iStatus=EComplete; |
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154 if(iYAdj==0 || ty>by) |
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155 return(ETrue); |
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156 } |
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157 return(EFalse); |
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158 } |
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159 |
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160 /** |
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161 By analysing the current state of the ellipse the process is taken to the next appropriate step. |
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162 If iStatus = EInitialised only one step will be taken, if the ellipse is already semi constructed then |
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163 it will be taken to completion. Takes in four point parameters that defines the rectangle in order to pass to |
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164 SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight). |
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165 @param aTopLeft Top left corner of rectangle |
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166 @param aTopRight Top right corner of rectangle |
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167 @param aBottomLeft Bottom left corner of rectangle |
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168 @param aBottomRight Bottom right corner of rectangle |
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169 @return TBool ETrue if a valid rectangle is produced, else EFalse. |
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170 */ |
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171 EXPORT_C TBool TEllipse::NextStep(TPoint& aTopLeft,TPoint& aTopRight, |
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172 TPoint& aBottomLeft,TPoint& aBottomRight) |
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173 { |
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174 if(iStatus==EInitialised) |
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175 return(SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight)); |
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176 TInt prevlev=iY; |
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177 TBool ret; |
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178 do |
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179 ret=SingleStep(aTopLeft,aTopRight,aBottomLeft,aBottomRight); |
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180 while(prevlev==iY && ret==EFalse); |
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181 return(ret); |
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182 } |
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183 |
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184 /** |
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185 Constructs an ellipse from the rectangle which it is given and assesses the |
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186 points position with regard to the ellipse and where they intersect. |
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187 @param aRect The rectangle within which the ellipse is drawn. |
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188 @param aPoint A point to compare with the ellipse to determine if intersection occurs. |
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189 @return TPoint The point is set to the corner which the intersection is nearest to. |
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190 */ |
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191 EXPORT_C TPoint TEllipse::Intersection(const TRect& aRect,const TPoint& aPoint) |
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192 { |
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193 Construct(aRect); //constructs the rect (an elipse object) |
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194 TPoint centre=aRect.Center(); //centre of ellipse |
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195 TPoint ptcpy(aPoint); |
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196 ptcpy-=iOffset; //ptcpy = aPoint - iOffset - TPoint(iA,iB) //radius from centre of ellipse |
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197 ptcpy-=TPoint(iA,iB); |
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198 TPoint pt[4],opt[4]; |
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199 TInt mpt[4],ompt[4]; |
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200 TInt count=0; |
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201 for(;count<4;count++) |
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202 ompt[count]=KMaxTInt; //fills ompt 1->4 with KMaxTInt |
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203 while(SingleStep(pt[0],pt[1],pt[2],pt[3])==EFalse) //creates a complete ellipse with pts as rect |
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204 for(count=0;count<4;count++) |
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205 { |
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206 mpt[count]=Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA)); |
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207 if(mpt[count]<ompt[count]) //use the larger number set. |
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208 { |
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209 ompt[count]=mpt[count]; |
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210 opt[count]=pt[count]; |
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211 } |
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212 } |
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213 if(pt[0].iY==pt[2].iY) //if it is horizontal |
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214 for(count=0;count<4;count++) |
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215 { |
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216 mpt[count]=Abs((pt[count].iY-iOffset.iY-iB)*(ptcpy.iX)-(ptcpy.iY)*(pt[count].iX-iOffset.iX-iA)); |
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217 if(mpt[count]<ompt[count]) //use the larger number set. |
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218 { |
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219 ompt[count]=mpt[count]; |
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220 opt[count]=pt[count]; |
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221 } |
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222 } |
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223 if(ptcpy.iX<0 && ptcpy.iY<0) //if point is further left and higher than centre of rect |
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224 return(opt[0]); |
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225 if(ptcpy.iY<0) //if point is higher than centre of rect |
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226 return(opt[1]); |
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227 if(ptcpy.iX<0) //if point is further left than centre of rect |
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228 return(opt[2]); |
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229 if(aPoint.iX<centre.iX && aPoint.iY<centre.iY) //if point is further left and higher than centre of rect |
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230 return(opt[0]); |
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231 if(aPoint.iY<centre.iY) //if point is higher than centre of rect |
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232 return(opt[1]); |
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233 if(aPoint.iX<centre.iX) //if point is further left than centre of rect |
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234 return(opt[2]); |
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235 return(opt[3]); //else |
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236 } |
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237 |
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238 // |
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239 // Ellipse drawing |
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240 // |
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241 |
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242 /** |
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243 Draws and fills an ellipse. |
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244 |
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245 The function provides a concrete implementation of the pure virtual |
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246 function <code>CGraphicsContext::DrawEllipse()</code>. The function |
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247 behaviour is the same as documented in that class. |
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248 */ |
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249 EXPORT_C void CFbsBitGc::DrawEllipse(const TRect& aRect) |
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250 { |
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251 if(CheckDevice(aRect)) return; |
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252 TRect rcpy(aRect); |
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253 rcpy.Move(iOrigin); |
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254 iDevice->TruncateRect(rcpy); |
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255 TRect clippedRect(rcpy); |
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256 clippedRect.Grow((iPenSize.iWidth>>1)+1,(iPenSize.iHeight>>1)+1); |
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257 if(UserClipRect(clippedRect)) return; |
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258 SetupDevice(); |
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259 iDevice->DrawingBegin(&iBrushBitmap); |
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260 CFbsRasterizer* brushRasterizer = PrepareRasterizerForExtendedBitmap(iBrushBitmap); |
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261 if(iBrushStyle!=ENullBrush) |
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262 EllipseFill(rcpy); |
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263 if(iPenStyle!=ENullPen) |
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264 { |
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265 if(iPenSize.iWidth>1 && iPenSize.iHeight>1) |
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266 EllipseOutlineWide(rcpy); |
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267 else |
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268 if(iPenSize.iWidth==1 || iPenSize.iHeight==1) |
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269 EllipseOutline(rcpy); |
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270 } |
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271 if (brushRasterizer) |
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272 { |
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273 brushRasterizer->EndBitmap(iBrushBitmap.SerialNumber()); |
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274 } |
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275 iDevice->DrawingEnd(&iBrushBitmap); |
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276 } |
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277 |
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278 void CFbsBitGc::EllipseOutline(const TRect& aRect) |
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279 { |
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280 CFbsDrawDevice* drawDevice = iDevice->iDrawDevice; |
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281 TPoint tl,tr,bl,br; |
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282 AddRect(aRect); |
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283 #if defined(_DEBUG) |
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284 TRect deviceDestRect; |
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285 drawDevice->GetDrawRect(deviceDestRect); |
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286 #endif |
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287 for(TInt count=0;count<iDefaultRegionPtr->Count();count++) |
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288 { |
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289 iClipRect=(*iDefaultRegionPtr)[count]; |
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290 if(!iClipRect.Intersects(aRect)) |
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291 continue; |
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292 iClipRect.Intersection(aRect); |
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293 if(UserClipRect(iClipRect)) continue; |
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294 BG_ASSERT_DEBUG(iClipRect.iTl.iX >= deviceDestRect.iTl.iX, EBitgdiPanicOutOfBounds); |
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295 BG_ASSERT_DEBUG(iClipRect.iTl.iY >= deviceDestRect.iTl.iY, EBitgdiPanicOutOfBounds); |
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296 BG_ASSERT_DEBUG(iClipRect.iBr.iX <= deviceDestRect.iBr.iX, EBitgdiPanicOutOfBounds); |
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297 BG_ASSERT_DEBUG(iClipRect.iBr.iY <= deviceDestRect.iBr.iY, EBitgdiPanicOutOfBounds); |
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298 TEllipse ellipse; |
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299 ellipse.Construct(aRect); |
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300 TInt pattern=0; |
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301 while(!ellipse.SingleStep(tl,tr,bl,br)) |
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302 { |
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303 if(iPenStyle==CGraphicsContext::ESolidPen || (iDotMask&(1<<(pattern%iDotLength)))) |
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304 { |
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305 if(tl.iY>=iClipRect.iTl.iY && tl.iY<iClipRect.iBr.iY) |
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306 { |
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307 if(tl.iX>=iClipRect.iTl.iX && tl.iX<iClipRect.iBr.iX) |
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308 drawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,iDrawMode); |
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309 if(tr.iX>=iClipRect.iTl.iX && tr.iX<iClipRect.iBr.iX && tl.iX!=tr.iX) |
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310 drawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,iDrawMode); |
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311 } |
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312 if(bl.iY>=iClipRect.iTl.iY && bl.iY<iClipRect.iBr.iY) |
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313 { |
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314 if(bl.iX>=iClipRect.iTl.iX && bl.iX<iClipRect.iBr.iX) |
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315 drawDevice->WriteRgb(bl.iX,bl.iY,iPenColor,iDrawMode); |
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316 if(br.iX>=iClipRect.iTl.iX && br.iX<iClipRect.iBr.iX && bl.iX!=br.iX) |
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317 drawDevice->WriteRgb(br.iX,br.iY,iPenColor,iDrawMode); |
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318 } |
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319 } |
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320 pattern++; |
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321 } |
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322 if(tl.iY==bl.iY && tl.iY>=iClipRect.iTl.iY && tl.iY<iClipRect.iBr.iY) |
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323 { |
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324 if(tl.iX>=iClipRect.iTl.iX && tl.iX<iClipRect.iBr.iX) |
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325 drawDevice->WriteRgb(tl.iX,tl.iY,iPenColor,iDrawMode); |
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326 if(tr.iX>=iClipRect.iTl.iX && tr.iX<iClipRect.iBr.iX && tl.iX!=tr.iX) |
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327 drawDevice->WriteRgb(tr.iX,tr.iY,iPenColor,iDrawMode); |
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328 } |
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329 drawDevice->UpdateRegion(iClipRect); |
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330 } |
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331 } |
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332 |
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333 void CFbsBitGc::EllipseOutlineWide(const TRect& aRect) |
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334 { |
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335 TRect rcpy(aRect); |
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336 TPoint tl,tr,bl,br; |
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337 TInt halfpenwidth=(iPenSize.iWidth+1)>>1; |
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338 TInt halfpenheight=(iPenSize.iHeight+1)>>1; |
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339 rcpy.Grow(halfpenwidth,halfpenheight); |
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340 AddRect(rcpy); |
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341 TInt dp=iDotParam; |
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342 for(TInt count=0;count<iDefaultRegionPtr->Count();count++) |
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343 { |
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344 iClipRect=(*iDefaultRegionPtr)[count]; |
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345 if(!iClipRect.Intersects(rcpy)) |
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346 continue; |
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347 iClipRect.Intersection(rcpy); |
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348 if(UserClipRect(iClipRect)) continue; |
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349 TEllipse ellipse; |
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350 ellipse.Construct(aRect); |
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351 iDotParam=Max(iPenSize.iWidth>>1,iPenSize.iHeight>>1); |
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352 while(!ellipse.SingleStep(tl,tr,bl,br)) |
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353 { |
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354 PenDrawClipped(tl); |
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355 PenDrawClipped(tr); |
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356 PenDrawClipped(bl); |
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357 PenDrawClipped(br); |
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358 iDotParam+=iDotDirection; |
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359 } |
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360 if(tl.iY==bl.iY) |
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361 { |
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362 PenDrawClipped(tl); |
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363 PenDrawClipped(tr); |
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364 } |
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365 iDevice->iDrawDevice->UpdateRegion(iClipRect); |
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366 } |
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367 iDotParam=dp; |
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368 } |
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369 |
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370 // if iBrushBitmap is an extended bitmap, PrepareRasterizerForExtendedBitmap() must have been called before this method |
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371 void CFbsBitGc::EllipseFill(const TRect& aRect) |
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372 { |
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373 TRect rcpy(aRect); |
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374 if(iPenSize.iWidth==0 || iPenSize.iHeight==0) |
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375 rcpy.Grow(1,1); |
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376 AddRect(aRect); |
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377 TPoint tl,tr,bl,br; |
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378 for(TInt count=0;count<iDefaultRegionPtr->Count();count++) |
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379 { |
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380 iClipRect=(*iDefaultRegionPtr)[count]; |
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381 if(!iClipRect.Intersects(rcpy)) |
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382 continue; |
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383 iClipRect.Intersection(rcpy); |
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384 if(UserClipRect(iClipRect)) continue; |
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385 TEllipse ellipse; |
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386 ellipse.Construct(rcpy); |
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387 while(!ellipse.NextStep(tl,tr,bl,br)) |
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388 { |
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389 tl.iX++; |
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390 tr.iX--; |
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391 bl.iX++; |
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392 br.iX--; |
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393 ClipFillLine(tl,tr); |
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394 ClipFillLine(bl,br); |
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395 } |
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396 if(tl.iY==bl.iY) |
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397 { |
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398 tl.iX++; |
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399 tr.iX--; |
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400 ClipFillLine(tl,tr); |
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401 } |
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402 iDevice->iDrawDevice->UpdateRegion(iClipRect); |
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403 } |
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404 } |
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405 |