Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebindings@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 212 insertions, 0 deletions

diff --git a/qtruby/rubylib/examples/qt-examples/chart/chartform_canvas.rb b/qtruby/rubylib/examples/qt-examples/chart/chartform_canvas.rb
new file mode 100644
index 00000000..86c66f76
--- /dev/null
+++ b/qtruby/rubylib/examples/qt-examples/chart/chartform_canvas.rb
@@ -0,0 +1,212 @@
+class ChartForm
+
+    def drawElements()
+        list = @canvas.allItems()
+        list.each do |it|
+            it.dispose
+        end
+    
+            # 360 * 16 for pies Qt works with 16ths of degrees
+        scaleFactor = @chartType == PIE ? 5760 :
+                            @chartType == VERTICAL_BAR ? @canvas.height() :
+                                @canvas.width()
+        biggest = 0.0
+        count = 0
+        total = 0.0
+        scales = Array.new(MAX_ELEMENTS)
+    
+        for i in 0...MAX_ELEMENTS
+            if  @elements[i].isValid() 
+                value = @elements[i].value()
+                count += 1
+                total += value
+                if  value > biggest
+                    biggest = value
+                end
+                scales[i] = @elements[i].value() * scaleFactor
+            end
+        end
+    
+        if count > 0
+                # 2nd loop because of total and biggest
+            for i in 0...MAX_ELEMENTS
+                if  @elements[i].isValid()
+                    if  @chartType == PIE
+                        scales[i] = (@elements[i].value() * scaleFactor) / total
+                    else
+                        scales[i] = (@elements[i].value() * scaleFactor) / biggest
+                    end
+                end
+            end
+    
+            case @chartType 
+                when PIE
+                    drawPieChart( scales, total, count )
+                when VERTICAL_BAR:
+                    drawVerticalBarChart( scales, total, count )
+                when HORIZONTAL_BAR:
+                    drawHorizontalBarChart( scales, total, count )
+            end
+        end
+    
+        @canvas.update()
+    end
+    
+    
+    def drawPieChart( scales, total, i )
+        width = @canvas.width().to_f
+        height = @canvas.height().to_f
+        size = width > height ? height : width
+        x = width / 2
+        y = height / 2
+        angle = 0
+    
+        for i in 0...MAX_ELEMENTS
+            if  @elements[i].isValid() 
+                extent = scales[i]
+                arc = Qt::CanvasEllipse.new( size, size, angle, extent, @canvas )
+                arc.setX( x )
+                arc.setY( y )
+                arc.setZ( 0 )
+                arc.setBrush( Qt::Brush.new( @elements[i].valueColor(),
+                                    @elements[i].valuePattern() ) )
+                arc.show()
+                angle += extent
+                label = @elements[i].label()
+                if  !label.empty? || @addValues != NO 
+                    label = valueLabel( label, @elements[i].value(), total )
+                    text = CanvasText.new( i, label, @font, @canvas )
+                    proX = @elements[i].proX( PIE ).to_f
+                    proY = @elements[i].proY( PIE ).to_f
+                    if  proX < 0 || proY < 0 
+                        # Find the centre of the pie segment
+                        rect = arc.boundingRect()
+                        proX = ( rect.width() / 2 ) + rect.x()
+                        proY = ( rect.height() / 2 ) + rect.y()
+                        # Centre text over the centre of the pie segment
+                        rect = text.boundingRect()
+                        proX -= ( rect.width() / 2 )
+                        proY -= ( rect.height() / 2 )
+                        # Make proportional
+                        proX /= width
+                        proY /= height
+                    end
+                    text.setColor( @elements[i].labelColor() )
+                    text.setX( proX * width )
+                    text.setY( proY * height )
+                    text.setZ( 1 )
+                    text.show()
+                    @elements[i].setProX( PIE, proX )
+                    @elements[i].setProY( PIE, proY )
+                end
+            end
+        end
+    end
+    
+    
+    def drawVerticalBarChart(scales, total, count )
+        width = @canvas.width().to_f
+        height = @canvas.height().to_f
+        prowidth = width / count
+        x = 0
+        pen = Qt::Pen.new
+        pen.style = NoPen
+    
+        for i in 0...MAX_ELEMENTS
+            if  @elements[i].isValid() 
+                extent = scales[i]
+                y = height - extent
+                rect = Qt::CanvasRectangle.new(x, y, prowidth, extent, @canvas )
+                rect.setBrush( Qt::Brush.new( @elements[i].valueColor(),
+                                        @elements[i].valuePattern() ) )
+                rect.setPen( pen )
+                rect.setZ( 0 )
+                rect.show()
+                label = @elements[i].label()
+                if  !label.empty? || @addValues != NO 
+                    proX = @elements[i].proX( VERTICAL_BAR ).to_f
+                    proY = @elements[i].proY( VERTICAL_BAR ).to_f
+                    if  proX < 0 || proY < 0 
+                        proX = x / width
+                        proY = y / height
+                    end
+                    label = valueLabel( label, @elements[i].value(), total )
+                    text = CanvasText.new( i, label, @font, @canvas )
+                    text.setColor( @elements[i].labelColor() )
+                    text.setX( proX * width )
+                    text.setY( proY * height )
+                    text.setZ( 1 )
+                    text.show()
+                    @elements[i].setProX( VERTICAL_BAR, proX )
+                    @elements[i].setProY( VERTICAL_BAR, proY )
+                end
+                x += prowidth
+            end
+        end
+    end
+    
+    
+    def drawHorizontalBarChart(scales, total, count )
+        width = @canvas.width().to_f
+        height = @canvas.height().to_f
+        proheight = height / count
+        y = 0
+        pen = Qt::Pen.new
+        pen.style = NoPen
+    
+        for i in 0...MAX_ELEMENTS
+            if  @elements[i].isValid() 
+                extent = scales[i]
+                rect = Qt::CanvasRectangle.new(0, y, extent, proheight, @canvas )
+                rect.setBrush( Qt::Brush.new( @elements[i].valueColor(),
+                                        @elements[i].valuePattern() ) )
+                rect.setPen( pen )
+                rect.setZ( 0 )
+                rect.show()
+                label = @elements[i].label()
+                if  !label.empty? || @addValues != NO 
+                    proX = @elements[i].proX( HORIZONTAL_BAR ).to_f
+                    proY = @elements[i].proY( HORIZONTAL_BAR ).to_f
+                    if  proX < 0 || proY < 0 
+                        proX = 0
+                        proY = y / height
+                    end
+                    label = valueLabel( label, @elements[i].value(), total )
+                    text = CanvasText.new( i, label, @font, @canvas )
+                    text.setColor( @elements[i].labelColor() )
+                    text.setX( proX * width )
+                    text.setY( proY * height )
+                    text.setZ( 1 )
+                    text.show()
+                    @elements[i].setProX( HORIZONTAL_BAR, proX )
+                    @elements[i].setProY( HORIZONTAL_BAR, proY )
+                end
+                y += proheight
+            end
+        end
+    end
+    
+    
+    def valueLabel(label, value, total )
+        if  @addValues == NO
+            return label
+        end
+    
+        newLabel = label
+        if  !label.empty?
+            if  @chartType == VERTICAL_BAR
+                newLabel += "\n"
+            else
+                newLabel += ' '
+            end
+        end
+        if  @addValues == YES
+            newLabel += "%.#{@decimalPlaces}f" % value
+        elsif  @addValues == AS_PERCENTAGE
+            newLabel += "%.#{@decimalPlaces}f%s" % [(value / total) * 100, '%']
+        end
+        return newLabel
+    end
+
+end
+