1 | # items.tcl -- |
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2 | # |
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3 | # This demonstration script creates a canvas that displays the |
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4 | # canvas item types. |
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5 | # |
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6 | # RCS: @(#) $Id: items.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $ |
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7 | |
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8 | if {![info exists widgetDemo]} { |
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9 | error "This script should be run from the \"widget\" demo." |
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10 | } |
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11 | |
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12 | set w .items |
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13 | catch {destroy $w} |
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14 | toplevel $w |
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15 | wm title $w "Canvas Item Demonstration" |
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16 | wm iconname $w "Items" |
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17 | positionWindow $w |
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18 | set c $w.frame.c |
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19 | |
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20 | label $w.msg -font $font -wraplength 5i -justify left -text "This window contains a canvas widget with examples of the various kinds of items supported by canvases. The following operations are supported:\n Button-1 drag:\tmoves item under pointer.\n Button-2 drag:\trepositions view.\n Button-3 drag:\tstrokes out area.\n Ctrl+f:\t\tprints items under area." |
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21 | pack $w.msg -side top |
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22 | |
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23 | frame $w.buttons |
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24 | pack $w.buttons -side bottom -fill x -pady 2m |
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25 | button $w.buttons.dismiss -text Dismiss -command "destroy $w" |
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26 | button $w.buttons.code -text "See Code" -command "showCode $w" |
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27 | pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 |
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28 | |
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29 | frame $w.frame |
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30 | pack $w.frame -side top -fill both -expand yes |
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31 | |
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32 | canvas $c -scrollregion {0c 0c 30c 24c} -width 15c -height 10c \ |
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33 | -relief sunken -borderwidth 2 \ |
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34 | -xscrollcommand "$w.frame.hscroll set" \ |
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35 | -yscrollcommand "$w.frame.vscroll set" |
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36 | scrollbar $w.frame.vscroll -command "$c yview" |
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37 | scrollbar $w.frame.hscroll -orient horiz -command "$c xview" |
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38 | |
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39 | grid $c -in $w.frame \ |
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40 | -row 0 -column 0 -rowspan 1 -columnspan 1 -sticky news |
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41 | grid $w.frame.vscroll \ |
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42 | -row 0 -column 1 -rowspan 1 -columnspan 1 -sticky news |
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43 | grid $w.frame.hscroll \ |
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44 | -row 1 -column 0 -rowspan 1 -columnspan 1 -sticky news |
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45 | grid rowconfig $w.frame 0 -weight 1 -minsize 0 |
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46 | grid columnconfig $w.frame 0 -weight 1 -minsize 0 |
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47 | |
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48 | # Display a 3x3 rectangular grid. |
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49 | |
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50 | $c create rect 0c 0c 30c 24c -width 2 |
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51 | $c create line 0c 8c 30c 8c -width 2 |
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52 | $c create line 0c 16c 30c 16c -width 2 |
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53 | $c create line 10c 0c 10c 24c -width 2 |
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54 | $c create line 20c 0c 20c 24c -width 2 |
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55 | |
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56 | set font1 {Helvetica 12} |
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57 | set font2 {Helvetica 24 bold} |
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58 | if {[winfo depth $c] > 1} { |
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59 | set blue DeepSkyBlue3 |
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60 | set red red |
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61 | set bisque bisque3 |
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62 | set green SeaGreen3 |
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63 | } else { |
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64 | set blue black |
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65 | set red black |
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66 | set bisque black |
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67 | set green black |
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68 | } |
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69 | |
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70 | # Set up demos within each of the areas of the grid. |
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71 | |
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72 | $c create text 5c .2c -text Lines -anchor n |
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73 | $c create line 1c 1c 3c 1c 1c 4c 3c 4c -width 2m -fill $blue \ |
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74 | -cap butt -join miter -tags item |
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75 | $c create line 4.67c 1c 4.67c 4c -arrow last -tags item |
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76 | $c create line 6.33c 1c 6.33c 4c -arrow both -tags item |
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77 | $c create line 5c 6c 9c 6c 9c 1c 8c 1c 8c 4.8c 8.8c 4.8c 8.8c 1.2c \ |
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78 | 8.2c 1.2c 8.2c 4.6c 8.6c 4.6c 8.6c 1.4c 8.4c 1.4c 8.4c 4.4c \ |
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79 | -width 3 -fill $red -tags item |
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80 | $c create line 1c 5c 7c 5c 7c 7c 9c 7c -width .5c \ |
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81 | -stipple @[file join $tk_library demos images gray25.bmp] \ |
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82 | -arrow both -arrowshape {15 15 7} -tags item |
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83 | $c create line 1c 7c 1.75c 5.8c 2.5c 7c 3.25c 5.8c 4c 7c -width .5c \ |
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84 | -cap round -join round -tags item |
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85 | |
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86 | $c create text 15c .2c -text "Curves (smoothed lines)" -anchor n |
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87 | $c create line 11c 4c 11.5c 1c 13.5c 1c 14c 4c -smooth on \ |
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88 | -fill $blue -tags item |
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89 | $c create line 15.5c 1c 19.5c 1.5c 15.5c 4.5c 19.5c 4c -smooth on \ |
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90 | -arrow both -width 3 -tags item |
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91 | $c create line 12c 6c 13.5c 4.5c 16.5c 7.5c 18c 6c \ |
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92 | 16.5c 4.5c 13.5c 7.5c 12c 6c -smooth on -width 3m -cap round \ |
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93 | -stipple @[file join $tk_library demos images gray25.bmp] \ |
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94 | -fill $red -tags item |
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95 | |
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96 | $c create text 25c .2c -text Polygons -anchor n |
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97 | $c create polygon 21c 1.0c 22.5c 1.75c 24c 1.0c 23.25c 2.5c \ |
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98 | 24c 4.0c 22.5c 3.25c 21c 4.0c 21.75c 2.5c -fill $green \ |
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99 | -outline black -width 4 -tags item |
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100 | $c create polygon 25c 4c 25c 4c 25c 1c 26c 1c 27c 4c 28c 1c \ |
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101 | 29c 1c 29c 4c 29c 4c -fill $red -smooth on -tags item |
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102 | $c create polygon 22c 4.5c 25c 4.5c 25c 6.75c 28c 6.75c \ |
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103 | 28c 5.25c 24c 5.25c 24c 6.0c 26c 6c 26c 7.5c 22c 7.5c \ |
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104 | -stipple @[file join $tk_library demos images gray25.bmp] \ |
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105 | -outline black -tags item |
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106 | |
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107 | $c create text 5c 8.2c -text Rectangles -anchor n |
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108 | $c create rectangle 1c 9.5c 4c 12.5c -outline $red -width 3m -tags item |
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109 | $c create rectangle 0.5c 13.5c 4.5c 15.5c -fill $green -tags item |
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110 | $c create rectangle 6c 10c 9c 15c -outline {} \ |
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111 | -stipple @[file join $tk_library demos images gray25.bmp] \ |
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112 | -fill $blue -tags item |
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113 | |
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114 | $c create text 15c 8.2c -text Ovals -anchor n |
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115 | $c create oval 11c 9.5c 14c 12.5c -outline $red -width 3m -tags item |
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116 | $c create oval 10.5c 13.5c 14.5c 15.5c -fill $green -tags item |
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117 | $c create oval 16c 10c 19c 15c -outline {} \ |
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118 | -stipple @[file join $tk_library demos images gray25.bmp] \ |
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119 | -fill $blue -tags item |
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120 | |
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121 | $c create text 25c 8.2c -text Text -anchor n |
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122 | $c create rectangle 22.4c 8.9c 22.6c 9.1c |
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123 | $c create text 22.5c 9c -anchor n -font $font1 -width 4c \ |
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124 | -text "A short string of text, word-wrapped, justified left, and anchored north (at the top). The rectangles show the anchor points for each piece of text." -tags item |
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125 | $c create rectangle 25.4c 10.9c 25.6c 11.1c |
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126 | $c create text 25.5c 11c -anchor w -font $font1 -fill $blue \ |
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127 | -text "Several lines,\n each centered\nindividually,\nand all anchored\nat the left edge." \ |
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128 | -justify center -tags item |
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129 | $c create rectangle 24.9c 13.9c 25.1c 14.1c |
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130 | $c create text 25c 14c -font $font2 -anchor c -fill $red -stipple gray50 \ |
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131 | -text "Stippled characters" -tags item |
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132 | |
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133 | $c create text 5c 16.2c -text Arcs -anchor n |
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134 | $c create arc 0.5c 17c 7c 20c -fill $green -outline black \ |
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135 | -start 45 -extent 270 -style pieslice -tags item |
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136 | $c create arc 6.5c 17c 9.5c 20c -width 4m -style arc \ |
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137 | -outline $blue -start -135 -extent 270 -tags item \ |
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138 | -outlinestipple @[file join $tk_library demos images gray25.bmp] |
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139 | $c create arc 0.5c 20c 9.5c 24c -width 4m -style pieslice \ |
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140 | -fill {} -outline $red -start 225 -extent -90 -tags item |
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141 | $c create arc 5.5c 20.5c 9.5c 23.5c -width 4m -style chord \ |
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142 | -fill $blue -outline {} -start 45 -extent 270 -tags item |
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143 | |
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144 | $c create text 15c 16.2c -text Bitmaps -anchor n |
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145 | $c create bitmap 13c 20c -tags item \ |
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146 | -bitmap @[file join $tk_library demos images face.bmp] |
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147 | $c create bitmap 17c 18.5c -tags item \ |
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148 | -bitmap @[file join $tk_library demos images noletter.bmp] |
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149 | $c create bitmap 17c 21.5c -tags item \ |
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150 | -bitmap @[file join $tk_library demos images letters.bmp] |
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151 | |
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152 | $c create text 25c 16.2c -text Windows -anchor n |
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153 | button $c.button -text "Press Me" -command "butPress $c $red" |
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154 | $c create window 21c 18c -window $c.button -anchor nw -tags item |
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155 | entry $c.entry -width 20 -relief sunken |
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156 | $c.entry insert end "Edit this text" |
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157 | $c create window 21c 21c -window $c.entry -anchor nw -tags item |
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158 | scale $c.scale -from 0 -to 100 -length 6c -sliderlength .4c \ |
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159 | -width .5c -tickinterval 0 |
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160 | $c create window 28.5c 17.5c -window $c.scale -anchor n -tags item |
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161 | $c create text 21c 17.9c -text Button: -anchor sw |
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162 | $c create text 21c 20.9c -text Entry: -anchor sw |
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163 | $c create text 28.5c 17.4c -text Scale: -anchor s |
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164 | |
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165 | # Set up event bindings for canvas: |
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166 | |
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167 | $c bind item <Any-Enter> "itemEnter $c" |
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168 | $c bind item <Any-Leave> "itemLeave $c" |
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169 | bind $c <2> "$c scan mark %x %y" |
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170 | bind $c <B2-Motion> "$c scan dragto %x %y" |
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171 | bind $c <3> "itemMark $c %x %y" |
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172 | bind $c <B3-Motion> "itemStroke $c %x %y" |
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173 | bind $c <Control-f> "itemsUnderArea $c" |
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174 | bind $c <1> "itemStartDrag $c %x %y" |
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175 | bind $c <B1-Motion> "itemDrag $c %x %y" |
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176 | |
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177 | # Utility procedures for highlighting the item under the pointer: |
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178 | |
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179 | proc itemEnter {c} { |
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180 | global restoreCmd |
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181 | |
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182 | if {[winfo depth $c] == 1} { |
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183 | set restoreCmd {} |
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184 | return |
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185 | } |
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186 | set type [$c type current] |
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187 | if {$type == "window"} { |
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188 | set restoreCmd {} |
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189 | return |
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190 | } |
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191 | if {$type == "bitmap"} { |
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192 | set bg [lindex [$c itemconf current -background] 4] |
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193 | set restoreCmd [list $c itemconfig current -background $bg] |
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194 | $c itemconfig current -background SteelBlue2 |
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195 | return |
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196 | } |
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197 | set fill [lindex [$c itemconfig current -fill] 4] |
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198 | if {(($type == "rectangle") || ($type == "oval") || ($type == "arc")) |
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199 | && ($fill == "")} { |
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200 | set outline [lindex [$c itemconfig current -outline] 4] |
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201 | set restoreCmd "$c itemconfig current -outline $outline" |
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202 | $c itemconfig current -outline SteelBlue2 |
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203 | } else { |
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204 | set restoreCmd "$c itemconfig current -fill $fill" |
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205 | $c itemconfig current -fill SteelBlue2 |
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206 | } |
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207 | } |
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208 | |
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209 | proc itemLeave {c} { |
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210 | global restoreCmd |
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211 | |
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212 | eval $restoreCmd |
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213 | } |
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214 | |
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215 | # Utility procedures for stroking out a rectangle and printing what's |
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216 | # underneath the rectangle's area. |
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217 | |
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218 | proc itemMark {c x y} { |
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219 | global areaX1 areaY1 |
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220 | set areaX1 [$c canvasx $x] |
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221 | set areaY1 [$c canvasy $y] |
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222 | $c delete area |
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223 | } |
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224 | |
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225 | proc itemStroke {c x y} { |
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226 | global areaX1 areaY1 areaX2 areaY2 |
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227 | set x [$c canvasx $x] |
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228 | set y [$c canvasy $y] |
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229 | if {($areaX1 != $x) && ($areaY1 != $y)} { |
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230 | $c delete area |
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231 | $c addtag area withtag [$c create rect $areaX1 $areaY1 $x $y \ |
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232 | -outline black] |
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233 | set areaX2 $x |
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234 | set areaY2 $y |
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235 | } |
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236 | } |
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237 | |
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238 | proc itemsUnderArea {c} { |
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239 | global areaX1 areaY1 areaX2 areaY2 |
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240 | set area [$c find withtag area] |
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241 | set items "" |
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242 | foreach i [$c find enclosed $areaX1 $areaY1 $areaX2 $areaY2] { |
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243 | if {[lsearch [$c gettags $i] item] != -1} { |
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244 | lappend items $i |
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245 | } |
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246 | } |
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247 | puts stdout "Items enclosed by area: $items" |
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248 | set items "" |
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249 | foreach i [$c find overlapping $areaX1 $areaY1 $areaX2 $areaY2] { |
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250 | if {[lsearch [$c gettags $i] item] != -1} { |
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251 | lappend items $i |
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252 | } |
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253 | } |
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254 | puts stdout "Items overlapping area: $items" |
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255 | } |
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256 | |
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257 | set areaX1 0 |
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258 | set areaY1 0 |
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259 | set areaX2 0 |
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260 | set areaY2 0 |
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261 | |
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262 | # Utility procedures to support dragging of items. |
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263 | |
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264 | proc itemStartDrag {c x y} { |
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265 | global lastX lastY |
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266 | set lastX [$c canvasx $x] |
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267 | set lastY [$c canvasy $y] |
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268 | } |
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269 | |
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270 | proc itemDrag {c x y} { |
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271 | global lastX lastY |
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272 | set x [$c canvasx $x] |
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273 | set y [$c canvasy $y] |
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274 | $c move current [expr {$x-$lastX}] [expr {$y-$lastY}] |
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275 | set lastX $x |
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276 | set lastY $y |
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277 | } |
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278 | |
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279 | # Procedure that's invoked when the button embedded in the canvas |
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280 | # is invoked. |
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281 | |
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282 | proc butPress {w color} { |
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283 | set i [$w create text 25c 18.1c -text "Ouch!!" -fill $color -anchor n] |
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284 | after 500 "$w delete $i" |
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285 | } |
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