pixel_drawing_mode
Figure's property setting the RGBwise pixels update mode when drawing
Description
Pixels colors are RGB encoded. Each R, G or B channel has an uint(8) value on [0, 255].
The pixel_drawing_mode is a figure property that specifies a RGBwise operation applied on every pixel of the incoming object, between RGB values of the input pixel color and RGB values the already existing pixel color of the figure. The result of this operation sets the new pixel color.
srcis the incoming color of the pixel.curis the current color of the pixel (which is already drawn).
pixel_drawing_mode are listed herebelow.
NOT vmeans255 - va AND bmeansa & ba OR bmeansa | ba XOR bmeans(a OR b) AND NOT (a AND b)
| Value | result |
|---|---|
| "copy" (default) | src |
| "copyInverted" | NOT src |
| "noop" | cur |
| "invert" | NOT cur |
| "set" | White |
| "clear" | Black |
| "equiv" | cur XOR (NOT src) |
| "xor" | cur XOR src |
| "or" | cur OR src |
| "orInverted" | cur OR (NOT src) |
| "orReverse" | (NOT cur) OR src |
| "nor" | NOT (cur OR src) |
| "and" | cur AND src |
| "andInverted" | cur AND (NOT src) |
| "andReverse" | (NOT cur) AND src |
| "nand" | NOT (cur AND src) |
Examples
pxmodes = ["copy", "copyInverted", "equiv", "xor", .. "and", "nand", "andReverse", "andInverted", .. "or", "nor", "orReverse", "orInverted", .. "noop", "set", "clear", "invert" .. ]; // sizes, and overlaying margins of figures s = 300; hm = 8; vm = 52; // for k = 16:-1:1 m = pxmodes(k); // Position of the figure i = fix((k-1)/4); j = modulo(k-1,4); // Creating the figure f = figure("toolbar_visible","off", .. "menubar_visible","off", .. "infobar_visible","off", .. "figure_position", [j*(s-hm), i*(s-vm)], .. "figure_size", [s s], .. "background", color("grey85"), .. "pixel_drawing_mode", m .. ); drawlater // Setting the axes b = 0.82; plot2d([],[],0,"051"," ",[-1 -1 1 1]*b) plot2d([-1 1]*b,[0 0]) a = gca(); a.isoview = "on"; a.tight_limits = "on"; title(m,"fontsize",4) // Drawing 3 overlaying colored disks xfarc(-0.7, 0.8, 1, 1, 0, 360*64) e = gce(); e.background = color("red"); e.fill_mode = "on"; xfarc(-0.2, 0.5, 1, 1, 0, 360*64) e = gce(); e.background = color("blue"); e.fill_mode = "on"; xfarc(-0.7, 0.2, 1, 1, 0, 360*64) e = gce(); e.background = color("green"); e.fill_mode = "on"; drawnow end // Removing all figures b = messagebox(_("Press OK to close all figures"),_("End of demo"), "question", "modal"); w = winsid(); close(w($-15:$));
See also
- Figure properties — description of the graphics figure entity properties
- anti_aliasing — Figure's property smoothing the stair-like aspect when rendering curves
- colordef — Set the color look-and-feel of a given or of all forthcoming graphic figures
- lighting — Lighting overview
- Matplot — 2D plot of a matrix using colors
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