Mapping two sets of co-ordinates with two different colours onto blank white screen

Hi, I have a blank Screen with dimensions:

Screen = 255*ones(1024,1280,3);

Where 1024 and 1280 are the height and width and 3 is the RGB component.

If I have two separate co-ordinate systems:

r1 = [randi([1 1000],1,1500)', randi([1 1000],1,1500)']; %1500 xy positions within the Screen (wanted in Blue)
r2 = [randi([1 1000],1,1500)', randi([1 1000],1,1500)']; %1500 xy positions within the Screen (wanted in Red)

Is there a quick way (without for loop, and without using plot) to map these co-ordinates onto the Screen, with r1 being blue and r2 being red?

Below is a crude image I've made using paint to give a little more context of what I'm trying to achieve (of course with way more dots!):

Any help would be greatly appreaciated! The reason I wanted to find a quick way is because I'll be doing something like this over many iterations so was wondering if there was a fast non-for-loopy way of mapping.

For example in the next iteration I wanted to keep this Screen with the blue and red dots and then overlay a new set of blue and red dots.

Many Thanks

Answer 1

[yanqi liu]

yes，sir，may be use

clc
clear all
close all

Screen = 255*ones(1024,1280,3);
r1 = [randi([1 1000],1,1500)', randi([1 1000],1,1500)']; %1500 xy positions within the Screen (wanted in Blue)
r2 = [randi([1 1000],1,1500)', randi([1 1000],1,1500)']; %1500 xy positions within the Screen (wanted in Red)

Screen1 = insertShape(uint8(Screen),'FilledCircle',[r1 ones(size(r1,1),1)],'color','blue');
Screen2 = insertShape(uint8(Screen),'FilledCircle',[r2 ones(size(r2,1),1)],'color','red');

figure; imshow(Screen1); title('blue');

figure; imshow(Screen2); title('red');

[Manny Kins]

Thank you! I managed to get them on the same screen using:

im = imfuse(Screen1,Screen2,'blend','Scaling','joint');
imshow(im)

Many thanks again!