Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/ZoomboxControl.java @ 543:9c2cf4811a7d
Added a control to reset the zoom of a chart. In addition, the zoom buttons are displayed as ImgButtons now.
flys-client/trunk@2049 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Fri, 03 Jun 2011 08:20:22 +0000 |
parents | ed29599e06e5 |
children | feaf6a8881ee |
rev | line source |
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540
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Implemented a zoombox control and added it to the chart toolbar.
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parents:
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1 package de.intevation.flys.client.client.ui.chart; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.List; |
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5 |
543
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6 import com.google.gwt.core.client.GWT; |
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7 |
540
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8 import com.smartgwt.client.types.Positioning; |
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9 import com.smartgwt.client.types.SelectionType; |
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10 import com.smartgwt.client.widgets.ImgButton; |
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11 import com.smartgwt.client.widgets.Canvas; |
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12 import com.smartgwt.client.widgets.events.MouseDownEvent; |
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13 import com.smartgwt.client.widgets.events.MouseDownHandler; |
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14 import com.smartgwt.client.widgets.events.MouseMoveEvent; |
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15 import com.smartgwt.client.widgets.events.MouseMoveHandler; |
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16 import com.smartgwt.client.widgets.events.MouseUpEvent; |
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17 import com.smartgwt.client.widgets.events.MouseUpHandler; |
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18 |
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19 import de.intevation.flys.client.client.event.HasZoomHandlers; |
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20 import de.intevation.flys.client.client.event.ZoomEvent; |
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21 import de.intevation.flys.client.client.event.ZoomHandler; |
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22 |
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23 |
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24 /** |
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25 * This control observes that panel retrieved by ChartOutputTab.getChartPanel(). |
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26 * If activated, a zoombox is drawn. One of the two edges is the position of the |
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27 * mouse down event on the observed panel. The other edge is specified by the |
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28 * current mouse position. If the mouse up event occurs, start and end point |
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29 * relative to the left and upper border of the observed panel is determined and |
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30 * a ZoomEvent is fired. |
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31 * |
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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33 */ |
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34 public class ZoomboxControl |
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35 extends ImgButton |
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36 implements MouseDownHandler, MouseUpHandler, MouseMoveHandler, HasZoomHandlers |
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37 { |
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38 protected List<ZoomHandler> handlers; |
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39 |
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40 protected ChartOutputTab chartTab; |
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41 |
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42 protected Canvas zoombox; |
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43 |
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44 protected int[] start; |
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45 protected int[] end; |
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46 |
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47 |
543
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parents:
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48 public ZoomboxControl(ChartOutputTab chartTab, String imageUrl) { |
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49 super(); |
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50 |
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51 this.handlers = new ArrayList<ZoomHandler>(); |
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52 this.chartTab = chartTab; |
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53 this.start = new int[2]; |
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54 this.end = new int[2]; |
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55 this.zoombox = new Canvas(); |
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56 |
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57 initZoombox(); |
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58 |
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59 String baseUrl = GWT.getHostPageBaseURL(); |
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60 setSrc(baseUrl + imageUrl); |
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61 setActionType(SelectionType.CHECKBOX); |
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62 setSize(20); |
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63 setShowRollOver(false); |
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64 setSelected(false); |
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65 |
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66 chartTab.getChartPanel().addMouseDownHandler(this); |
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67 chartTab.getChartPanel().addMouseMoveHandler(this); |
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68 chartTab.getChartPanel().addMouseUpHandler(this); |
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69 } |
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70 |
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71 |
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72 /** |
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73 * Initializes the zoombox that is displayed over the observed area. The |
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74 * zoombox has an opaque background. Its height/width and x/y values are |
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75 * determined by the start point (mouse down) and the current mouse |
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76 * position. |
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77 */ |
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78 protected void initZoombox() { |
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79 zoombox.setPosition(Positioning.ABSOLUTE); |
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80 zoombox.setBorder("2px solid black"); |
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81 zoombox.setOpacity(50); |
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82 zoombox.setWidth(0); |
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83 zoombox.setHeight(0); |
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84 } |
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85 |
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86 |
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87 /** |
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88 * Registers a new ZoomHandler that wants to listen to ZoomEvents. |
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89 * |
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90 * @param handler A new ZoomHandler. |
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91 */ |
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92 public void addZoomHandler(ZoomHandler handler) { |
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93 if (handler != null) { |
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94 handlers.add(handler); |
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95 } |
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96 } |
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97 |
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98 |
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99 /** |
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100 * A mouse down event on the specified area will set the start point for the |
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101 * zoombox. |
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102 * |
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103 * @param event The mouse down event which contains the xy coordinates of |
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104 * the observed area. |
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105 */ |
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106 public void onMouseDown(MouseDownEvent event) { |
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107 if (!isSelected()) { |
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108 return; |
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109 } |
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110 |
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111 start[0] = getRelativeX(event.getX()); |
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112 start[1] = getRelativeY(event.getY()); |
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113 |
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114 end[0] = start[0]; |
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115 end[1] = start[1]; |
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116 |
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117 chartTab.getChartPanel().addChild(zoombox); |
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118 |
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119 positionZoombox(); |
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120 } |
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121 |
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122 |
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123 /** |
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124 * A mouse move event on the specified area will set the end point for the |
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125 * zoombox. If the end point differs from the start point, an opaque box is |
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126 * displayed. |
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127 * |
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128 * @param event The mouse move event which contains the xy coordinates of |
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129 * the observed area. |
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130 */ |
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131 public void onMouseMove(MouseMoveEvent event) { |
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132 if (!isSelected()) { |
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133 return; |
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134 } |
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135 |
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136 end[0] = getRelativeX(event.getX()); |
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137 end[1] = getRelativeY(event.getY()); |
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138 |
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139 positionZoombox(); |
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140 } |
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141 |
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142 |
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143 /** |
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144 * The mouse up event finalizes the zoom operation. It sets the end point |
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145 * for this operation, clears the zoombox and fires a ZoomEvent. |
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146 * |
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147 * @param event The mouse up event which contains the xy coordinates of the |
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148 * observed area. |
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149 */ |
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150 public void onMouseUp(MouseUpEvent event) { |
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151 if (!isSelected()) { |
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152 return; |
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153 } |
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154 |
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155 end[0] = getRelativeX(event.getX()); |
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156 end[1] = getRelativeY(event.getY()); |
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157 |
541
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158 fireZoomEvent(); |
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159 |
540
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160 clearZoombox(); |
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161 |
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162 chartTab.getChartPanel().removeChild(zoombox); |
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163 } |
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164 |
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165 |
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166 /** |
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167 * Returns the X coordinate relative to the left border. |
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168 * |
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169 * @param x The X coordinate relative to the window. |
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170 * |
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171 * @return the X coordinate relative to the left border. |
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172 */ |
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173 protected int getRelativeX(int x) { |
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174 return x - chartTab.getChartPanel().getPageLeft(); |
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175 } |
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176 |
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177 |
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178 /** |
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179 * Returns the Y coordinate relative to the top border. |
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180 * |
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181 * @param y The Y coordinate relative to the window. |
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182 * |
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183 * @return the Y coordinate relative to the top border. |
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184 */ |
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185 protected int getRelativeY(int y) { |
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186 return y - chartTab.getChartPanel().getPageTop(); |
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187 } |
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188 |
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189 |
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190 /** |
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191 * Returns min and max x/y values based on the stored values in <i>start</i> |
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192 * and <i>end</i>. |
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193 * |
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194 * @return an int[] as follows: [xmin, ymin, xmax, ymax]. |
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195 */ |
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196 protected int[] orderPositions() { |
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197 int xmin = start[0] < end[0] ? start[0] : end[0]; |
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198 int ymin = start[1] < end[1] ? start[1] : end[1]; |
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199 |
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200 int xmax = start[0] >= end[0] ? start[0] : end[0]; |
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201 int ymax = start[1] >= end[1] ? start[1] : end[1]; |
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202 |
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203 return new int[] { xmin, ymin, xmax, ymax }; |
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204 } |
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205 |
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206 |
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207 /** |
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208 * Sets the width, height, x and y values of the zoombox. |
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209 */ |
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210 protected void positionZoombox() { |
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211 int[] values = orderPositions(); |
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212 |
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213 zoombox.setLeft(values[0]); |
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214 zoombox.setTop(values[1]); |
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215 zoombox.setWidth(values[2] - values[0]); |
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216 zoombox.setHeight(values[3] - values[1]); |
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217 } |
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218 |
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219 |
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220 /** |
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221 * Clears the zoombox (set position and size to null). |
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222 */ |
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223 protected void clearZoombox() { |
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224 zoombox.setLeft(0); |
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225 zoombox.setTop(0); |
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226 zoombox.setWidth(0); |
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227 zoombox.setHeight(0); |
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228 } |
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229 |
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230 |
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231 /** |
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232 * Fires a ZoomEvent to all registered listeners. |
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233 */ |
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234 protected void fireZoomEvent() { |
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235 int[] pos = orderPositions(); |
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236 |
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237 ZoomEvent event = new ZoomEvent(pos[0], pos[1], pos[2], pos[3]); |
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238 |
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239 for (ZoomHandler handler: handlers) { |
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240 handler.onZoom(event); |
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241 } |
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242 } |
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243 } |
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244 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |