lec12 2d and 3d graphics.pdf

7/28/2019 Lec12 2D and 3D Graphics.pdf

1/18

2D and 3D Graphics

Lecture Week 12


2/18

Making Images Move

How can wemake such an

animation?

One image

moving across

another

image


3/18

Making Images Move

An image is an object just like the rectangle Has a handle, and properties that can be changed

Example setting the location of an image within an

axis

h = i mage( 256*r and( 100) )

set(h, ' XDat a' , [ 10, 30] , ' YDat a' , [ 30, 50] ) ;

ex01_sprites.m


4/18

ex01_sprites.mclose all

bkgrd = imread('track.png');

[car, map, alpha] =

imread('car.png');

figure;

image([bkgrd; bkgrd]);

axis('equal');

holdon

yLoc = 1300;

xLoc = 250;

h = image(car, 'XData', ...

[xLoc, xLoc+size(car,2)-1], ...

'YData', ...

[yLoc, yLoc+size(car,1)-1], ...

'AlphaData', alpha);

for yLoc = 1300:-10:100

if rem(yLoc, 100) == 0

xOffset = 10*rand - 5;

end;

xLoc = xLoc + xOffset;

set(h, 'XData', ...

[xLoc, xLoc+size(car,2)-1], ...

'YData', ...

[yLoc, yLoc+size(car,1)-1]);

pause(0.01);

drawnow

end;


5/18

Simple 3D Curve Plott = 0:0.01:3*2*pi;

x = cos(t);

y = sin(t);

z = t/(2*pi*3);

plot3(x,y,z);axis equal

[az, el] = view;

for i = 1:300

view(az+i, el);

drawnow;

pause(0.01)

end;

ex02_3Dcurve.m

http://www.astrobio.nau.edu/~koerner/ast301/lecture/lecture1/lec1.html


6/18

Surface Plots - Exampleg = zeros(41);

for x = -10:0.5:10

for y = -10:0.5:10

g(round(2*x+21),round(2*y+21)) = ...

exp(-(x.^2 + y.^2)/50);end;

end;

surf(g)


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Surface Plots - Exampleg = zeros(41);

for x = -10:0.5:10

for y = -10:0.5:10

g(round(2*x+21),round(2*y+21)) = ...

exp(-(x.^2 + y.^2)/50);end;

end;

surf(g)

ex03_gaussian2DLoops.m


8/18

Surface Plots meshgrid shortcut[x, y] = meshgrid(-10:0.5:10, -10:0.5:10);

g = exp(-(x.^2 + y.^2)/50);

surf(g)

ex04_gaussian2D.m


9/18

Surface Plots Making a Sphere[lon,lat] = meshgrid([0:15:360],[-90:15:90]);

x = cosd(lat).*cosd(lon);

y = cosd(lat).*sind(lon);

z = sind(lat);

surf(x,y,z)

-1

-0.5

0

0.5

1

-1

-0.5

0

0.5

1

-1

-0.5

0

0.5

1

ex05_sphere.m


10/18

-1

-0.5

0

0.5

1

-1

-0.5

0

0.5

1-1

-0.5

0

0.5

1

Surface Plots Making an Earth[lon,lat] = meshgrid([0:360],[-90:90]);

x = cosd(lat).*cosd(lon);

y = cosd(lat).*sind(lon);

z = sind(lat);

im = imread('earth.png');surf(x,y,z,double(flipud(rgb2gray(im))))

shading interp

axis equal

el = 45;

az = 315;

view(az, el);

ex06_earth.m


11/18

Detailed 3D Drawing


12/18

Detailed 3D Drawing


13/18

Patch Object

A patch graphics object is composed of one or morepolygons that may or may not be connected

patch(X,Y,Z,C)


14/18

Patch Object

Making a cube:Help MATLAB 3D Visualization Creating 3D Models with Patches Multifaceted Patches


15/18

Patch Object

Making a cube:Help MATLAB 3D Visualization Creating 3D Models with Patches Multifaceted Patches


16/18

Cube ExampleX = [0 1 1 0 0 0;

1 1 0 0 1 1;

1 1 0 0 1 1;

0 1 1 0 0 0];

Y = [0 0 1 1 0 0;

0 1 1 0 0 0;

0 1 1 0 1 1;

0 0 1 1 1 1];

Z = [0 0 0 0 0 1;

0 0 0 0 0 1;

1 1 1 1 0 1;

1 1 1 1 0 1];

c = cat(3, X, Y, Z);

patch(X, Y, Z, c);

axis equal

view(45, 45);

ex07_cube.m


17/18

Random Walls Exampley = randi(10,1,10);

x = randi(10,1,10);

z = zeros(1,10);

patch([x;x+1;x+1;x],[y;y;y;y],[z;z;z+1;z+1],rand(4,10))

o = randi(2,1,10) - 1;

patch([x;x+o;x+o;x],[y;y+1-o;y+1-o;y],[z;z;z+1;z+1],rand(4,10))

view(20, 60);

ex08_randomWalls.m


18/18

Camera ControlsHelp MATLAB 3D Visualization Defining the View Camera Graphics Functions

lec12 2d and 3d graphics.pdf

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