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courses:intro.prototyping.fall.2017.sep19

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courses:intro.prototyping.fall.2017.sep19 [2017/09/19 06:26]
rickard
courses:intro.prototyping.fall.2017.sep19 [2017/09/19 06:32] (current)
rickard
Line 1: Line 1:
 +=== Intro to processing ===
  
 +Processing is an open source programming environment and community that can be found at[[http://​www.processing.org/​|processing.org]] ​
 +
 +Homework until next time: Using 2D-shapes, draw some graphics, and have hem change somehow. For example, use a variable to change the value of color, size, position, movement.
 +
 +We learned to draw 2D stuff with code like this:
 +
 +<code java>
 +void setup()// This is where we prepare stuff
 +{
 +  size(640, 480);//size of canvas
 +  background(0);//​color of background
 +  fill(200);//​color filled areas
 +  stroke(255, 0, 0);//color of lines
 +}
 +
 +void draw()//​This is where the magic happens
 +{
 +    rect(70, 70, 100, 100);//draw a rectangle
 +}
 +
 +</​code>​
 +
 +To keep track of the X-coordinate while moving a rectangle we used a variable:
 +<code java>
 +int Joe; //Naming the variable, and stating it's a number
 +
 +void setup()// This is where we prepare stuff
 +{
 +  size(320, 240);
 +  Joe = 10;//​setting inital value
 +}
 +
 +void draw()//​This is where the magic happens
 +{
 +  background(0);//​redraw background
 +  Joe=Joe+1; //​increasing the variable by one
 +  rect(Joe, 70, 100, 100);//​drawing the rectangle using the variable as x-coordinate
 +}
 +</​code>​
 +
 +We got introduced to IF-statements to make changes when circumstances are met:
 +<code java>
 +
 +  if(Joe > 320) //If variable is more than 320
 +  {
 +    Joe = 0;  //we set variable back to 0
 +  }
 +</​code>​
 +
 +
 +We also tried out the for-loop for stuff that gets repeated a number of times:
 +<code java>
 +    for (int i=0; i<5; i++) //the following will happen 5 times
 +    {
 +      rect(55*i, 55, 50, 50); //you can use the counter variable i, if you want to
 +    }
 +</​code>​
 +  ​
 +<code java>
 +  System variables we talked about:
 +  mouseX: contains the X-coordinate of the pointer as a number
 +  mouseY: contains the Y-coordinate of the pointer as a number
 +
 +  Other useful system variables:
 +  width: contains the width of your sketch as a number
 +  height: contains the height of your sketch as a number
 +  displayWidth:​ contains the width of your whole screen
 +  displayHeight:​ contains the height of your whole screen
 +
 +
 +  ​
 +  Commands we used:
 +  point();//​draw point
 +  line();//​draw line
 +  rect(); //draw rectangle
 +
 +  println(); //print out the content of a variable
 +  random(); //gives you a random number
 +  noCursor();//​hides the mousepointer
 +  background();//​draws background with specified color
 +  fill();//​sets color for shape areas
 +  stroke();//​sets color of lines and frames
 +  noFill(); noStroke(); //stops using fill and stroke
 +</​code>​
 +  ​
 +For the full info of the use of these commands I encourage you to look up the commands in the[[http://​www.processing.org/​reference|reference]] part of the processing site. 
 + 
courses/intro.prototyping.fall.2017.sep19.txt · Last modified: 2017/09/19 06:32 by rickard