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Thread: XY plots with color squares -- i.e. shmoo plots

  1. #1
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    Default XY plots with color squares -- i.e. shmoo plots

    What's the best way to represent XY plots with color squares, as typified by "shmoo plots"?

    i.e. QColor shmoo[x][y];

    where: X + Y represent the coordinates of a square, and a color per square can be assigned

    These don't appear to be a native plot type -- so how much functionality can be gained by overloading current functionality?

    Constraints:

    - Axis numbers must be placed in-between grid lines.
    - Grid lines bound each square.
    - Each square may be a different color.

    Examples:

    image5224074054341222068.jpg

    sram4.jpg

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    Default Re: XY plots with color squares -- i.e. shmoo plots

    Quote Originally Posted by alketi View Post
    What's the best way to represent XY plots with color squares, as typified by "shmoo plots"?
    There are plot and paint device coordinates - how are your squares related to these coordinate systems ?

    Uwe

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    Default Re: XY plots with color squares -- i.e. shmoo plots

    Quote Originally Posted by Uwe View Post
    There are plot and paint device coordinates - how are your squares related to these coordinate systems ?
    So, in the attached image the relationship would be:
    PLOT COORDINATES
    x=10
    y=2.5

    DATA COORDINATES
    x=0
    y=0

    The squares could be just a simple 2D array of color, as in:

    QColor shmoo[10][10];
    shmoo [0][0] = QColor("red");

    But, they could also be represented in another way, if that's easier.

    My requirements are
    1. Create a plot that looks like the attached
    2. Allow the user to click on a specific square and, in plot coordinates, re-measure that point. So, in the example below, clicking anywhere inside the lower-left point would tell me to re-measure Freq(x)=10MHz, Voltage(y)=2.5V.

    What is the best way to draw color squares in Qwt that accomplishes these two goals?

    Thank you for your guidance Uwe.

    image5224074054341222068.jpg

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    Default Re: XY plots with color squares -- i.e. shmoo plots

    The squares could be just a simple 2D array of color, ...
    This can be done with a QwtPlotSpectrogram.

    QwtMatrixRasterData in NearestNeighbur mode is close to what you want to do - see the rasterview example.

    Allow the user to click on a specific square and, in plot coordinates, re-measure that point.
    Using QwtPlotPicker you have the plot coordinates of each click.

    Uwe

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