colorbar

clf reset                           // clears and resets the figure
gcf().color_map = jet(100); // sets its color map

// Axes on the left
// ----------------
subplot(1,2,1)                      // Now the default current axes
ax0 = gca();                        //  is on the half left
ax0.axes_bounds(3)  //  Here is its initial width

// The axes is clear. There is no plotted data.
// We explicitely create a colorbar from scratch:
// colbar1 is the handle of the color bar, to postprocess and customize it.
colbar1 = colorbar(-2, 8, [1 100])    // It is inserted on the right

// The current (empty) axes is still the same:
gca() == ax0

// But its width has been shrunk (by -15%) to set the
// colorbar on its right side.
gca().axes_bounds

colbar1.type
ylabel(colbar1, "Temperature [°C]") // Let's add a label
title("°C")                         // or as title
colbar1.title.font_size = 3;        // .. with a bigger font
// Beware: xlabel(), ylabel() title() moves the focus to the bar.
sca(ax0); // Reset the focus to ax0 before going on

// Now plot a frame in the empty axes:
plot2d([], [], 0, "011", " ", [0 0 1 1])

// Then add some other color bars, still for the current axes
cb = colorbar(-2, 5, [1 70])
// Set the labels in red
cb.font_color = color("red");

// The current axes is shrunk. The bar's width is decreased accordingly.

// axes on the right
// -----------------
subplot(1,2,2)
plot2d([], [], 0, "011", " ", [0 0 1 1])

ax1 = gca();
// top half of the colormap, with another data scale:
colbar3 = colorbar(0, 1.5, [$/2+1 $])

// Color bar post-processing
//      decrease its font size:
set(colbar3, "fractional_font","on","font_size", 0.5);
//      vertically extend the bar, to match the axes height:
colbar3.axes_bounds([2 4]) = ax1.axes_bounds([2 4]);
colbar3.margins([3 4]) = ax1.margins([3 4]);
//      reverse its graduations top-down:
colbar3.axes_reverse(2) = "on";
//      put its graduations on the left side:
colbar3.y_location = "left";

// Color bars are automatically redrawn and regraduated
// when resizing the figure. Try it!

clf reset   // Default colormap used
// 1) Matplot: implicit minU, maxU, colminmax = [umin umax]
subplot(2,2,1)
Matplot([1 2 3; 4 5 7]);
colorbar   // [1 7] graduations covered by colors #[1 7].
           // Ticks on middles of colored blocks

// 2) Matplot: Default colminmax = [1 Nc]
subplot(2,2,2)
Matplot([1 2 3;4 5 7]);
colorbar(1,7)   // [1 7] covered with the whole colormap.
                // "1" at the very bottom. "7" at the very top.

// 3) Matplot: another colors range, with explicit colminmax
subplot(2,2,3)
Matplot([1 2 3;4 5 7])
colorbar(3,7, [3 7])
// Ticks 2.5-7.5 expected:
//  - integer values ticked at the middle of colors blocks
//  - other .5 values ticked at the blocks separations

x = linspace(0,1,81);
z = cos(2*%pi*x)'*sin(2*%pi*x);
n = 10;
clf
gcf().color_map = jet(n);
Sgrayplot(x, x, z);
contour(x,x,z,[-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8]);
gce().children.children(1:2:$-1).foreground=-1; // contours in black

colorbar
// Default umin = minU, umax = maxU, colminmax = [1 Nc]
// * "-1" tick at the very bottom of the scale
// * "1" tick at the very top
// * Nice subticks, at blocks middles & blocks limits
// * The contours levels must be at the right levels on the color bar

x = linspace(0,1,81);
z = cos(2*%pi*x)'*sin(2*%pi*x);
n = 8;
clf reset
gcf().color_map = jet(20);
gcf().axes_size = [770 320];

// 3.2) umin=minU and umax=maxU, covered by a subrange of colors
subplot(1,2,1)
Sgrayplot(x, x, z,colminmax=[3 n+2]);
contour(x,x,z,[-0.75 -0.5 -0.25 0 0.25 0.5 0.75]);
colorbar(-%inf,%inf,[3 n+2]);
// * The contours levels must be at the right levels on the color bar

// 3.3) Explicit umin and umax, with saturation for z values out of [umin, umax]:
subplot(1,2,2)
Sgrayplot(x, x, z, zminmax = [-0.6 0.8], colminmax = [5 11]);
contour(x,x,z,[-0.6 -0.4 -0.2 0.2 0.4 0.6]);
colorbar(-0.6, 0.8,[5 11]);

function [zz, zz1]=plotSphere()
    r = 0.3;
    orig = [1.5 0 0];
    deff("[x,y,z]=sph(alp,tet)",["x=r*cos(alp).*cos(tet)+orig(1)*ones(tet)";..
         "y=r*cos(alp).*sin(tet)+orig(2)*ones(tet)";..
         "z=r*sin(alp)+orig(3)*ones(tet)"]);
    [xx,yy,zz] = eval3dp(sph,linspace(-%pi/2,%pi/2,40),linspace(0,%pi*2,20));
    [xx1,yy1,zz1] = eval3dp(sph,linspace(-%pi/2,%pi/2,40),linspace(0,%pi*2,20));
    cc  = (xx+zz+2)*32;
    cc1 = (xx1-orig(1)+zz1/r+2)*32;
    plot3d1([xx xx1],[yy yy1],list([zz,zz1],[cc cc1]),theta=70,alpha=80,flag=[5,6,3])
endfunction

clf reset
gcf().color_map = jet(120);  // 120 colors available
gcf().axes_size = [670, 560];

// For these 4 plots of a sphere of radius 0.3,
//  the color-value relationship is the same.

// 3.0) Implicit min(u), max(u), on the whole color map
subplot(2,2,1)
plotSphere();
colorbar;               // graduations on [-0.3 0.3]

// 3.1) Selection of a data range. Color range set accordingly
subplot(2,2,2)
plotSphere();
colorbar(0.0, 0.15, -1);// graduations on [0, 0.15]

// 3.2) Selection of a colormap interval. umin & umax set accordingly
subplot(2,2,3)
plotSphere();
colorbar(,,[60 120]);  // graduations on [0, 0.3]

// 3.3) Selection of the first half of the colormap. umin & umax set accordingly
subplot(2,2,4)
plotSphere();
colorbar(,,[1 $/2]);  // graduations on [-0.3, 0]

function plotSample()
    t=[-4:0.1:4];
    e = plot3d(t,t,sin(t)'*cos(t));
    e.color_flag = 1;
    e.color_mode = -2;
endfunction

clf
gcf().color_map = rainbow(200);
gcf().axes_size = [800 300];

// 5.1) Bar graduated from minU=-1 to maxU=1 with the full colormap
subplot(1,2,1)
plotSample();
colorbar;

// 5.2) Consistent U/colors fractional selection (top 40%)
subplot(1,2,2)
plotSample();
colorbar(,,[0.6 1]);

gcf().children([2 4]).rotation_angles = [55 45];

exec("SCI/modules/graphics/demos/colormap/colormaps.dem.sce",-1)