Calculating the scale factor for "bar rectangles" of Chart app
I have an array of integer values
String[]开发者_如何学Go values={3100,7500,8000,4200,88000,71000,32000};
that need to be scaled into a known height of my JComponent
, the question is how to scale these values into e.g. h=600px?
Here is a pic just for more clarification of what i want to achieve:
Thanks
bar_height = chart_height*(value/max_value)
To determine bar_height
, you scale (multiply) chart_height
by (value/max_value)
, where:
bar_height
is the height of the a bar in pixels.value
is the value to be charted.max_value
is the maximum value on the y-axis.chart_height
is the height of the chart in pixels (600 in your example).
For example:
88000/88000 = 1.0, or 100% of the chart height (600px) 0/88000 = 0, or 0% of the chart's height ( 0px) 3100/88000 = ~0.035, or ~3.53% of the chart's height (~21px)
精彩评论