Differences

This shows you the differences between two versions of the page.

--- pdf:transformationexamples [2015/04/02 18:09] – [flip vertically and located origin in upper left corner] christian
+++ pdf:transformationexamples [2015/04/02 18:12] (current) – [flip vertically] christian
@@ Line 27: / Line 27: @@
 ===== flip vertically =====
-**x -> x  ,  y -> -y**
+<code smalltalk>
+"x -> x  ,  y -> -y
 In this example the matrix is coded manually.
-It can also be coded as <code smalltalk>Matrix scale: 4 @ -4</code> to get ''[4 0 0 -4 0 0]''
+It can also be coded as Matrix scale: 4 @ -4 to get '[4 0 0 -4 0 0]'
-and <code smalltalk>(Matrix scale: 4 @ -4) translate: 50 @ 50</code> to get ''[4 0 0 -4 50 50]''"
+and (Matrix scale: 4 @ -4) translate: 50 @ 50 to get '[4 0 0 -4 50 50]'"
-<code smalltalk>
 page := Graphics.PDF.Page
   newInBounds: (-100 @ -100 corner: 100 @ 100)
@@ Line 53: / Line 52: @@
 ===== flip horizontally =====
-	"x -> -x  ,  y -> y"
+<code smalltalk>
-	page := Graphics.PDF.Page
+"x -> -x  ,  y -> y"
-		newInBounds: (-100 @ -100 corner: 100 @ 100)
+page := Graphics.PDF.Page
-		colorspace: DeviceRGB new
+  newInBounds: (-100 @ -100 corner: 100 @ 100)
-		render: [:renderer ¦
+  colorspace: DeviceRGB new
-				renderer concat: (Matrix scale: -1 @ 1).
+  render: [:renderer ¦
-			renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
+    renderer concat: (Matrix scale: -1 @ 1).
-			renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
+    renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
-			renderer textObjectDo: [
+    renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
-				renderer setFont: #Helvetica size: 1.
+    renderer textObjectDo: [
-				renderer textMatrix: #(-4 0 0 4 50 50); showString: '(50 50)'.
+      renderer setFont: #Helvetica size: 1.
-				renderer textMatrix: #(-2 0 0 2 -50 50); showString: '(-50 50)'.
+      renderer textMatrix: #(-4 0 0 4 50 50); showString: '(50 50)'.
-				renderer textMatrix: #(-2 0 0 2 50 -50); showString: '(50 -50)'.
+      renderer textMatrix: #(-2 0 0 2 -50 50); showString: '(-50 50)'.
-				renderer textMatrix: #(-2 0 0 2 -50 -50); showString: '(-50 -50)']].
+      renderer textMatrix: #(-2 0 0 2 50 -50); showString: '(50 -50)'.
-	page saveAndShowAs: 'demo10b_transformationsFlipHorizontally.pdf'
+      renderer textMatrix: #(-2 0 0 2 -50 -50); showString: '(-50 -50)']].
+page saveAndShowAs: 'demo10b_transformationsFlipHorizontally.pdf'
+</code>
 {{demo10b_transformationsfliphorizontally.pdf}}
 ===== flip diagonally =====
-	"x -> -x  ,  y -> -y"
+<code smalltalk>
-	page := Graphics.PDF.Page
+"x -> -x  ,  y -> -y"
-		newInBounds: (-100 @ -100 corner: 100 @ 100)
+page := Graphics.PDF.Page
-		colorspace: DeviceRGB new
+  newInBounds: (-100 @ -100 corner: 100 @ 100)
-		render: [:renderer ¦
+  colorspace: DeviceRGB new
-				renderer concat: (Matrix scale: -1 @ -1).
+  render: [:renderer ¦
-			renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
+    renderer concat: (Matrix scale: -1 @ -1).
-			renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
+    renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
-			renderer textObjectDo: [
+    renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
-				renderer setFont: #Helvetica size: 1.
+    renderer textObjectDo: [
-				renderer textMatrix: #(-4 0 0 -4 50 50); showString: '(50 50)'.
+      renderer setFont: #Helvetica size: 1.
-				renderer textMatrix: #(-2 0 0 -2 -50 50); showString: '(-50 50)'.
+      renderer textMatrix: #(-4 0 0 -4 50 50); showString: '(50 50)'.
-				renderer textMatrix: #(-2 0 0 -2 50 -50); showString: '(50 -50)'.
+      renderer textMatrix: #(-2 0 0 -2 -50 50); showString: '(-50 50)'.
-				renderer textMatrix: #(-2 0 0 -2 -50 -50); showString: '(-50 -50)']].
+      renderer textMatrix: #(-2 0 0 -2 50 -50); showString: '(50 -50)'.
-	page saveAndShowAs: 'demo10c_transformationsFlipDiagonal.pdf'
+      renderer textMatrix: #(-2 0 0 -2 -50 -50); showString: '(-50 -50)']].
+page saveAndShowAs: 'demo10c_transformationsFlipDiagonal.pdf'
+</code>
 {{demo10c_transformationsflipdiagonal.pdf}}