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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
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