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GT LCC 6310 - LCC 6310 Computation as an Expressive Medium

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LCC 6310 Computation as an Expressive Medium Lecture 3 Suggestions on learning to program Spend a lot of time fiddling around with code Programming is something you have to learn by trying it Get help from other people I expect those who already know some programming to help others Figure things out in groups Ask me questions in class Outline Programming concepts Built in Processing methods you fill in Loops Reading the time Arrays Questions about assignment 1 setup setup is called once when a sketch first starts executing Place any startup code in setup eg Setting the size Setting the background color Initializing variables draw draw is called continuously by the program Put code in draw when you need to constantly update the display for example animating an object Example of setup and draw int x int y void setup size 400 400 background 0 x 0 y height 2 void draw background 0 ellipse x y 20 20 x x 1 if x width x 0 Controlling draw framerate can be used to set the number of times per second that draw is called framerate 30 says to call draw 30 times a second if the computer is capable of it delay delays execution for a certain number of milliseconds delay 250 delays for 250 milliseconds 1 4 of a sec You can use delay or framerate to determine how fast you want draw to be called framerate is probably easier noloop tells the system to stop calling draw If you want to for example turn off animation loop tells the system to start calling draw again Use noloop and loop together to turn drawing on and off Getting info from the mouse mouseX and mouseY variables that automagically contain the current mouse location pmouseX and pmouseY hold the previous location mousePressed boolean variable that is true if the mouse button is down mouseButton value is LEFT RIGHT or CENTER depending on which button is held down Mouse methods There are several built in methods you can fill in to process mouse events mousePressed mouseReleased mouseMoved mouseDragged Let s look at examples Loops Sometimes you want to execute code multiple times E g draw is being called in a loop Java provides a number of looping mechanisms They all test some boolean expression just like an if statement does and continue to execute code while the expression is true while loops while boolean exp code to execute multiple times Executes code while the boolean expression is true for loops for init statement boolean exp final statement code to execute in loop First executes the initialization statement Then tests the boolean expression if it s true executes the code once Then repeats the following execute final statement test boolean exp execute code if true Converting for to while Seeing how for loops can be converted to while loops helps you understand for for init statement boolean exp final statement code is the same as init statement while boolean exp code final statement Reading time int hour returns the hour 0 23 int minute returns the minutes 0 59 int second returns the seconds 0 59 int day returns the day of the month 1 31 int month returns the month 1 12 int year returns the four digit year e g 2004 float milliseconds returns number of millis since start of app draw has nothing to do with time The value returned by second or milliseconds has nothing to do with how often draw is called In draw you draw frames you don t know how often it will be called Put a println in loop to see how often it gets called long lastTimeLoopWasCalled 0 void draw long milliseconds millis println milliseconds lastTimeLoopWasCalled lastTimeLoopWasCalled milliseconds Effect of creating an int variable Code Effect Name anInt Type int Single int int anInt Put a value in the int anInt 3 Type error anInt hello Name anInt Type int 3 Name anInt Type int hello Can t shove hello into an int Effect of creating an array of ints Code declare byte array int intArray initialize byte array intArray new int 5 set first element intArray 0 3 set third element intArray 2 5 Effect Name intArray Type int 0 1 2 3 4 0 0 0 0 0 each element has type int 0 1 2 3 4 3 0 0 0 0 0 1 2 3 4 3 0 5 0 0 Practice reading code If code is a medium then it can be both written and read Reading code reveals New programming constructs Strategies and techniques design patterns Style Philosophical assumptions deep reading Let s figure out the Motion BrownianMotion example together New constructs Array declaration and reference Math operations and functions Type casting


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GT LCC 6310 - LCC 6310 Computation as an Expressive Medium

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