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Carleton University
Computer Science
COMP 1005
Jason Hinek

January 17 2013 chapters 1,2,4,5,6. //comments /* comments size(x,y); //define size of the window background(R,G,B); colour textSize(int); fill(R,G,B); text(“text”,x,y); stroke(R,G,B); //outline colour noStroke(); //no outline strokeWeight(int); //thickness of outline ellipse(x,y,r,r); rect(x,y,w,h); colours can have 4 coordinates (R,G,B,A) Alpha value : opacity math : text(+-*/%) the / only give the quotient without the remainder % does a division and keeps the remainder if you let x=a number, you can use any value for x. so, int x; x=number; float means decimal number float xreal = number; dont do % in real numbers to print equation and answer : text(“x+18=”+(x+18),x,y); char c='x'; boolean can either be true or false boolean blue = true else ifs : fills in blue office hours. Thursday 2;30 3'30 random() gives a random number use width and height for rect spiral Variables: Everything has a type: • int (integers) • float (decimals) • boolean (true/false) • char (single character) other data types : • colors(RGB,RGBA,gray scale) • string (word, sentence) • Pimage (graphics) Casting: casting converts a data type into another Branching: if and if else and switch Operators: • == is equal to • != not equal to • < less than • > greater than • <= less or equal to • >= greater or equal to • && and • || or • ! not Starry night size(600,300); ellipse(300,150,590,290); strokeWeight(10); int a=300; int b=150; point(a,b); int x; while ((a<600||a>0)||(b<300||b>0)){ x=(int) random(5); if (x==1) { a+=10; //point(a,b-10); } else if (x==2) { a-=10; //point(a,b+10); } else if (x==3) { b+=10; //point(a+10,b); } else if (x==4) { b-=10; //point(a-10,b); } point(a,b); } January 24 2013 if statements if (sky is blue) print “Hurray!” if(sky is not blue) print”Booo” OR if(sky is blue) print”Hurray” else print”Boooo” th January 29 2013 type void= returns nothing setup () in brackets are the inputs February 12 2013 for(initialization, condition, increment) { for(initialization,condition,increment){ } } let's say we have an integer as an input, the output will be: true if (n=a^2+b^2) false (otherwise) in code: //initialization void setup() { size(600, 400); background(0); } boolean isSumOfSquares(int n) { for (int b=0;b<=n;b+=1) { for (int a=0;a<=n;a+=1) { if (n==(a*a)+(b*b)) { return true; } } } return false; } void mousePressed() { background(0); int num = mouseX + mouseY; if (isSumOfSquares(num)) { text("Yes"+num+"is the sum of squares", 100, 100); } else { text("No"+num+"is not the sum of squares", 100, 100); } } //main body void draw() { } Array: remember sets of numbers and variables for us intQ[]=new int [100]; February 28 2013 loadPixels(); [work with pixels] width*height updatePixels(); row*width+col -width -1 130 1 +width March 5 2013 Review What happens in a dynamic sketch ? There is a sequence of things that happens : 1. reads variable and function definitions. 2. Executes setup().At the bottom of draw, hidden to us, it updates the screen. 3. Executes draw(). Updates screen. 4. Goes back to 3 over and over. What happens when I want to click a button to make an interaction ? 1. Start → state of the program. (snapshot of
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