The QtiPlot Handbook
PrevChapter 5. The DialogsNext

Gradient Fill

This dialog allows to quickly customize the colors in a color map using one of the following color definition modes: One Color, Two Colors, Three Colors, Custom Color Map, Palette or Colormap files.

Figure 5-6. The One Color mode of the Gradient Fill dialog box.

In the One Color mode all color levels in the map have the same color.

Figure 5-7. The Two Colors mode of the Gradient Fill dialog box.

In the Two Colors mode the levels are defined using a linear interpolation between the colors defined with the From and To buttons.

Figure 5-8. The Three Colors mode of the Gradient Fill dialog box.

In the Three Colors mode this dialog displays a Middle color button, together with a percentage input box, allowing to choose the position of the third color in the colormap.

Figure 5-9. The Custom Color Map mode of the Gradient Fill dialog box.

In the Custom Color Map mode this dialog displays the From and To color buttons, together with other five intermediate colors. These seven colors are used to create a linear color gradient.

It is possible to select a color map from a predefined list of palettes if the current mode is set to Palette.

Figure 5-10. The Palette mode of the Gradient Fill dialog box.

In the Colormap files mode, it is possible to select a color map stored in a .map file. The format of a .map file is very simple: it is a text file in which each line defines a color using the RGB color model. The red, green and blue components of a color must be integers between 0 and 255. Numbers should be separated by spaces. A colection of .map files can be downloaded by pressing the Download push button.

Figure 5-11. The Colormap files mode of the Gradient Fill dialog box.

PrevHomeNext
Set Equidistant LevelsUpAdd Error bars