author | Claus Gittinger <cg@exept.de> |
Mon, 31 Mar 2003 11:53:22 +0200 | |
changeset 7142 | 7a6297c86ef4 |
parent 7083 | 16019f54bdb8 |
child 7582 | 279c8f991809 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libbasic' }" |
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Object subclass:#Geometric |
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instanceVariableNames:'' |
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classVariableNames:'Scale InverseScale' |
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poolDictionaries:'' |
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category:'Graphics-Geometry' |
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! |
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!Geometric class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1995 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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documentation |
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Abstract superclass for geometric figures. |
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Concrete classes are (currently) Rectangle, Polygon and the classes |
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found in goodies/shape. |
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These are not graphical objects, but pure mathematical ones. |
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I.e. instances do not carry graphics attributes such as color, lineWidth etc. |
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However, they ``know'' how to display themself as stroked or possibly |
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filled picture on a graphicsContext (although, the GC's current |
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paint and lineStyles are used). |
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Use instances of (subclasses) of DisplayObject or |
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of the GeometricWrapper classes for objects which keep the color |
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and lineStyle information with them. |
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Notice: |
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ST/X does not use Geometric instances for drawing (yet). |
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Except for Rectangle, Geometry and its subclasses exists mainly |
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for ST-80 compatibility and to provide a home when other (PD) |
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geometry classes are to be filed in. |
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[author:] |
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Claus Gittinger |
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[see also:] |
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Rectangle Polygon EllipticalArc Circle Spline Point |
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LineSegment Curve Arrow ArrowedSpline |
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GraphicsContext |
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StrokingWrapper FillingWrapper |
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! |
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examples |
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line segment: |
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[exBegin] |
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|v l| |
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v := (View extent:100@100) openAndWait. |
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l := LineSegment from:10@10 to:90@90. |
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v paint:Color red. |
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l displayStrokedOn:v. |
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l start:90@10 end:10@90. |
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v paint:Color blue. |
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l displayStrokedOn:v. |
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[exEnd] |
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rectangle, unfilled: |
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[exBegin] |
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|v r| |
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v := (View extent:100@100) openAndWait. |
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r := Rectangle origin:10@10 corner:90@90. |
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v paint:Color red. |
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r displayStrokedOn:v. |
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[exEnd] |
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circle; filled and unfilled: |
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[exBegin] |
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|v c| |
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v := (View extent:200@100) openAndWait. |
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c := Circle boundingBox:(10@10 corner:90@90). |
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v paint:Color blue. |
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c displayFilledOn:v. |
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c center:150@50. |
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v paint:Color red. |
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c displayStrokedOn:v. |
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[exEnd] |
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circle & rectangle; both filled: |
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[exBegin] |
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|v c| |
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v := (View extent:100@100) openAndWait. |
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c := Circle center:50@50 radius:40. |
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v paint:Color red. |
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c asRectangle displayFilledOn:v. |
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v paint:Color blue. |
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c displayFilledOn:v. |
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[exEnd] |
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elliptical arcs; filled & unfilled: |
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[exBegin] |
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|v e| |
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v := (View extent:200@100) openAndWait. |
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e := EllipticalArc |
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boundingBox:(10@10 corner:190@90) |
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startAngle:0 |
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endAngle:270. |
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v paint:Color blue. |
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e displayFilledOn:v. |
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v paint:Color red. |
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e displayStrokedOn:v. |
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[exEnd] |
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polygon; filled & unfilled: |
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[exBegin] |
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|v p| |
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v := (View extent:100@100) openAndWait. |
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p := Polygon vertices: |
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(Array with:(10@10) |
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with:(90@90) |
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with:(10@90)). |
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v paint:Color blue. |
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p displayFilledOn:v. |
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v paint:Color red. |
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p displayStrokedOn:v. |
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[exEnd] |
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circles; filled & unfilled: |
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[exBegin] |
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|v c| |
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v := View new openAndWait. |
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c := Circle center:50@50 radius:40. |
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c displayFilledOn:v. |
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50 to:1 by:-1 do:[:r | |
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c radius:r. |
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v paint:(Color grey:(r * 2)). |
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c displayStrokedOn:v. |
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]. |
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1 to:50 do:[:r | |
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c radius:r. |
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v paint:(Color grey:100-(r * 2)). |
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c displayStrokedOn:v. |
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] |
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[exEnd] |
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arcs; filled: |
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[exBegin] |
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|v ell| |
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v := View new openAndWait. |
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ell := EllipticalArc |
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boundingBox:(10@10 corner:90@90) |
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startAngle:0 |
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sweepAngle:0. |
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#(45 90 135 180 225 270 315 360) keysAndValuesDo:[:index :angle | |
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index odd ifTrue:[ |
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v paint:Color white |
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] ifFalse:[ |
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v paint:Color black |
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]. |
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ell sweepAngle:angle. |
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ell displayFilledOn:v. |
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Delay waitForSeconds:0.5. |
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209 |
]. |
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210 |
|
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211 |
[exEnd] |
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arcs; filled: |
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213 |
[exBegin] |
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214 |
|v ell| |
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215 |
|
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v := View new openAndWait. |
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217 |
|
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ell := EllipticalArc |
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boundingBox:(10@10 corner:90@90) |
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startAngle:0 |
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sweepAngle:45. |
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222 |
|
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#(45 90 135 180 225 270 315 360) |
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with:#( 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1) |
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do:[:angle :grey | |
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ell startAngle:angle-45. |
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227 |
v paint:(ColorValue red:grey green:0 blue:0). |
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ell displayFilledOn:v. |
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]. |
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|
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[exEnd] |
1353 | 232 |
spline; filled & unfilled: |
233 |
[exBegin] |
|
234 |
|v p| |
|
235 |
||
236 |
v := (View extent:100@100) openAndWait. |
|
237 |
||
238 |
p := Spline controlPoints: |
|
1354 | 239 |
(Array with:(20@20) |
240 |
with:(80@80) |
|
241 |
with:(20@80)). |
|
1353 | 242 |
|
243 |
v paint:Color blue. |
|
244 |
p displayFilledOn:v. |
|
245 |
||
246 |
v paint:Color red. |
|
247 |
p displayStrokedOn:v. |
|
248 |
[exEnd] |
|
249 |
||
250 |
closed spline; filled & unfilled: |
|
251 |
[exBegin] |
|
252 |
|v p| |
|
253 |
||
254 |
v := (View extent:100@100) openAndWait. |
|
255 |
||
256 |
p := Spline controlPoints: |
|
1354 | 257 |
(Array with:(20@20) |
258 |
with:(80@80) |
|
259 |
with:(20@80) |
|
260 |
with:(20@20)). |
|
1353 | 261 |
|
262 |
v paint:Color blue. |
|
263 |
p displayFilledOn:v. |
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264 |
||
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v paint:Color red. |
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266 |
p displayStrokedOn:v. |
|
267 |
[exEnd] |
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" |
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269 |
! ! |
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270 |
|
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271 |
!Geometric class methodsFor:'initialization'! |
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272 |
|
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273 |
initialize |
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274 |
"setup class constants" |
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275 |
|
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276 |
"/ these are note used in ST/X; |
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277 |
"/ (acc. to a testers note, ST-80 internally uses |
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278 |
"/ integer valued coordinates, scaling coordinates by |
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279 |
"/ the Scale constant. ST/X does not do this. However, |
2382 | 280 |
"/ user supplied subclasses may depend on those values being |
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281 |
"/ present ...) |
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282 |
|
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283 |
Scale := 4096. |
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284 |
InverseScale := 1.0 / Scale |
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285 |
|
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286 |
" |
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287 |
Geometric initialize |
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288 |
" |
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289 |
|
2382 | 290 |
"Modified: 12.2.1997 / 14:11:49 / cg" |
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291 |
! ! |
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292 |
|
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293 |
!Geometric class methodsFor:'helper functions'! |
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294 |
|
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295 |
boundingRectangleForPoints:aSequencableCollectionOfPoints |
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296 |
"given a bunch of point, compute the boundingRectangle |
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297 |
(i.e. the smallest rectangle which encloses all of those points)" |
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298 |
|
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299 |
|p minX minY maxX maxY n "{ Class: SmallInteger }" |
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300 |
x y | |
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301 |
|
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302 |
p := aSequencableCollectionOfPoints first. |
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303 |
minX := maxX := p x. |
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304 |
minY := maxY := p y. |
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305 |
|
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306 |
n := aSequencableCollectionOfPoints size. |
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307 |
1 to:n do:[:idx | |
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308 |
p := aSequencableCollectionOfPoints at:idx. |
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309 |
x := p x. |
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310 |
y := p y. |
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311 |
x < minX ifTrue:[ |
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312 |
minX := x |
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313 |
] ifFalse:[ |
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314 |
x > maxX ifTrue:[ |
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315 |
maxX := x |
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|
316 |
] |
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|
317 |
]. |
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318 |
y < minY ifTrue:[ |
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319 |
minY := y |
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320 |
] ifFalse:[ |
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321 |
y > maxY ifTrue:[ |
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322 |
maxY := y |
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323 |
] |
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|
324 |
]. |
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|
325 |
]. |
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|
326 |
|
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327 |
^ Rectangle left:minX top:minY right:maxX bottom:maxY |
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|
328 |
|
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|
329 |
"Modified: 12.2.1997 / 12:10:12 / cg" |
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330 |
! ! |
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331 |
|
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332 |
!Geometric methodsFor:'converting'! |
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333 |
|
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334 |
asFiller |
1353 | 335 |
"return a wrapper which displays the receiver in its filled form" |
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336 |
|
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337 |
self canBeFilled ifTrue:[ |
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338 |
^ FillingWrapper on:self |
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339 |
]. |
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340 |
^ self shouldNotImplement |
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341 |
|
6065 | 342 |
" |
343 |
|v r| |
|
344 |
||
345 |
v := View new. |
|
346 |
v extent:200@200. |
|
347 |
v openAndWait. |
|
348 |
r := Rectangle origin:10@10 corner:100@100. |
|
349 |
r asFiller displayOn:v. |
|
350 |
" |
|
351 |
||
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352 |
"Modified: 12.2.1997 / 11:47:22 / cg" |
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353 |
! |
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354 |
|
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355 |
asRectangle |
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356 |
"return the enclosing rectangle; same as #bounds" |
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357 |
|
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358 |
^ self bounds |
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359 |
|
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360 |
"Created: 8.5.1996 / 14:36:35 / cg" |
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361 |
! |
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362 |
|
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363 |
asStroker |
1353 | 364 |
"return a wrapper which displays the receiver as stroked outline" |
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365 |
|
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366 |
^ StrokingWrapper on:self |
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367 |
|
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368 |
"Created: 8.5.1996 / 14:38:09 / cg" |
1353 | 369 |
"Modified: 8.5.1996 / 18:23:00 / cg" |
2377 | 370 |
! |
371 |
||
4352 | 372 |
asVisualComponent |
373 |
"return a wrapper on the receiver, which responds to VisualComponent messages." |
|
374 |
||
2377 | 375 |
^ self asStroker |
376 |
||
377 |
"Created: 10.2.1997 / 12:04:27 / cg" |
|
356 | 378 |
! ! |
379 |
||
380 |
!Geometric methodsFor:'displaying'! |
|
381 |
||
7083 | 382 |
ascentOn:aGC |
383 |
"displayOn: does not draw above baseline" |
|
384 |
||
385 |
^ 0 |
|
386 |
! |
|
387 |
||
610 | 388 |
displayFilledOn:aGC |
389 |
"display myself filled on a graphicsContext; the current graphics |
|
390 |
attributes are used. Since we do not know how to do it, nothing is |
|
391 |
drawn here." |
|
392 |
||
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393 |
^ self subclassResponsibility |
610 | 394 |
|
6065 | 395 |
" |
396 |
|v r| |
|
397 |
||
398 |
v := View new. |
|
399 |
v extent:200@200. |
|
400 |
v openAndWait. |
|
401 |
r := Rectangle origin:10@10 corner:100@100. |
|
402 |
r displayFilledOn:v. |
|
403 |
" |
|
404 |
||
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405 |
"Modified: 8.5.1996 / 09:07:02 / cg" |
610 | 406 |
! |
407 |
||
6925 | 408 |
displayOn:aGCOrStream |
356 | 409 |
"display myself on a graphicsContext; the current graphics |
410 |
attributes are used. The default here is to display the outline." |
|
411 |
||
6925 | 412 |
"/ what a kludge - Dolphin and Squeak mean: printOn:; |
413 |
"/ ST/X (and some old ST80's) mean: draw-yourself on. |
|
414 |
(aGCOrStream isStream or:[aGCOrStream == Transcript]) ifTrue:[ |
|
415 |
^ super displayOn:aGCOrStream |
|
416 |
]. |
|
417 |
^ self displayStrokedOn:aGCOrStream |
|
6065 | 418 |
|
419 |
" |
|
420 |
|v r| |
|
421 |
||
422 |
v := View new. |
|
423 |
v extent:200@200. |
|
424 |
v openAndWait. |
|
425 |
r := Rectangle origin:10@10 corner:100@100. |
|
426 |
r displayOn:v. |
|
427 |
" |
|
356 | 428 |
! |
429 |
||
430 |
displayStrokedOn:aGC |
|
431 |
"display my outline on a graphicsContext; the current graphics |
|
1357 | 432 |
attributes are used. Since we do not know how to do it, nothing is |
356 | 433 |
drawn here." |
434 |
||
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|
435 |
^ self subclassResponsibility |
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|
436 |
|
1357 | 437 |
"Modified: 8.5.1996 / 21:20:19 / cg" |
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|
438 |
! ! |
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|
439 |
|
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|
440 |
!Geometric methodsFor:'queries'! |
356 | 441 |
|
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|
442 |
bounds |
2381
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|
443 |
"return the smallest enclosing rectangle. |
10af98758a49
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changeset
|
444 |
This resends computeBounds, to allow caching of bounds in |
10af98758a49
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changeset
|
445 |
case this computation is expensive." |
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changeset
|
446 |
|
2381
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parents:
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|
447 |
^ self computeBounds |
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|
448 |
|
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|
449 |
"Created: 8.5.1996 / 13:56:08 / cg" |
2381
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changeset
|
450 |
"Modified: 12.2.1997 / 11:41:38 / cg" |
1446
fabdc1d2598c
added #canBeFilled for protocol completeness
Claus Gittinger <cg@exept.de>
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changeset
|
451 |
! |
fabdc1d2598c
added #canBeFilled for protocol completeness
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
452 |
|
fabdc1d2598c
added #canBeFilled for protocol completeness
Claus Gittinger <cg@exept.de>
parents:
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changeset
|
453 |
canBeFilled |
fabdc1d2598c
added #canBeFilled for protocol completeness
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parents:
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changeset
|
454 |
"return true, if the receiver can be drawn as a filled geometric. |
fabdc1d2598c
added #canBeFilled for protocol completeness
Claus Gittinger <cg@exept.de>
parents:
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changeset
|
455 |
Return false here, since we dont know." |
fabdc1d2598c
added #canBeFilled for protocol completeness
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parents:
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changeset
|
456 |
|
fabdc1d2598c
added #canBeFilled for protocol completeness
Claus Gittinger <cg@exept.de>
parents:
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changeset
|
457 |
^ false |
fabdc1d2598c
added #canBeFilled for protocol completeness
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
458 |
|
fabdc1d2598c
added #canBeFilled for protocol completeness
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parents:
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diff
changeset
|
459 |
"Created: 1.6.1996 / 11:28:58 / cg" |
2376 | 460 |
! |
461 |
||
2381
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
462 |
computeBounds |
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
463 |
"return the smallest enclosing rectangle." |
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
464 |
|
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
465 |
^ self subclassResponsibility |
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
466 |
|
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
467 |
"Created: 12.2.1997 / 11:41:58 / cg" |
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
468 |
! |
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
469 |
|
4352 | 470 |
outlineIntersects:aRectangle |
2376 | 471 |
"return true, if the receivers image intersects |
472 |
aRectangle, when drawn as an outline. |
|
473 |
Here, all we can do is to ask the boundary rectangle; |
|
474 |
subclasses should reimplement better checks." |
|
4352 | 475 |
|
2376 | 476 |
^ self bounds intersects:aRectangle |
477 |
||
478 |
"Modified: 10.2.1997 / 13:40:36 / cg" |
|
479 |
! |
|
480 |
||
4352 | 481 |
regionIntersects:aRectangle |
2376 | 482 |
"return true, if the receivers image intersects |
483 |
aRectangle, when drawn as a filled version. |
|
484 |
Here, all we can do is to ask the boundary rectangle; |
|
485 |
subclasses should reimplement better checks." |
|
4352 | 486 |
|
2376 | 487 |
^ self bounds intersects:aRectangle |
488 |
||
489 |
"Modified: 10.2.1997 / 13:40:00 / cg" |
|
356 | 490 |
! ! |
491 |
||
4352 | 492 |
!Geometric methodsFor:'testing'! |
493 |
||
494 |
isBezier2Segment |
|
495 |
"return true, if the receiver is a quadratic bezier segment" |
|
496 |
||
497 |
^ false |
|
498 |
! |
|
499 |
||
500 |
isLineSegment |
|
501 |
"return true, if the receiver is a line segment" |
|
502 |
||
503 |
^ false |
|
504 |
! ! |
|
505 |
||
5570 | 506 |
!Geometric methodsFor:'transformations'! |
2377 | 507 |
|
4352 | 508 |
scaledBy:scaleAmount |
2377 | 509 |
"return a copy of the receiver, which is scaled by the argument, |
510 |
a point or number" |
|
4352 | 511 |
|
2377 | 512 |
^ self subclassResponsibility |
513 |
||
514 |
"Created: 10.2.1997 / 12:05:45 / cg" |
|
515 |
! |
|
516 |
||
4352 | 517 |
translatedBy:scaleAmount |
2377 | 518 |
"return a copy of the receiver, which is translated by the argument, |
519 |
a point or number" |
|
4352 | 520 |
|
2377 | 521 |
^ self subclassResponsibility |
522 |
||
523 |
"Created: 10.2.1997 / 12:05:56 / cg" |
|
524 |
! ! |
|
525 |
||
637 | 526 |
!Geometric class methodsFor:'documentation'! |
527 |
||
528 |
version |
|
7083 | 529 |
^ '$Header: /cvs/stx/stx/libbasic/Geometric.st,v 1.29 2003-02-28 17:20:18 cg Exp $' |
637 | 530 |
! ! |
6925 | 531 |
|
2381
10af98758a49
added dummy Scale & InverseScale classVars.
Claus Gittinger <cg@exept.de>
parents:
2377
diff
changeset
|
532 |
Geometric initialize! |