diff options
Diffstat (limited to 'qtruby/rubylib/examples/qt-examples/chart/chartform_canvas.rb')
| -rw-r--r-- | qtruby/rubylib/examples/qt-examples/chart/chartform_canvas.rb | 212 |
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 + |