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83 lines
2.7 KiB
Plaintext
83 lines
2.7 KiB
Plaintext
/**
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* Characters Strings.
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*
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* Click on the image to give it focus and then type letters to
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* shift the location of the image.
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* Characters are typographic symbols such as A, d, and %.
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* The character datatype, abbreviated as char, stores letters and
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* symbols in the Unicode format, a coding system developed to support
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* a variety of world languages. Characters are distinguished from other
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* symbols by putting them between single quotes ('P').
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* A string is a sequence of characters. A string is noted by surrounding
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* a group of letters with double quotes ("Processing").
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* Chars and strings are most often used with the keyboard methods,
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* to display text to the screen, and to load images or files.
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*/
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PImage frog;
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PFont font;
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int xoffset;
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char letter;
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void setup()
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{
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size(200, 200, P2D);
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font = loadFont("Eureka-90.vlw");
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textFont(font);
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// Draw text more accurately and efficiently.
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textMode(SCREEN);
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textAlign(CENTER);
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// The String datatype must be capitalized because it is a complex datatype.
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// A String is actually a class with its own methods, some of which are
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// featured below.
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String name = "rathausFrog";
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String extension = ".jpg";
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int nameLength = name.length();
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println("The length of " + name + " is " + nameLength + ".");
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name = name.concat(extension);
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nameLength = name.length();
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println("The length of " + name + " is " + nameLength + ".");
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// The parameter for the loadImage() method must be a string
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// This line could also be written "frog = loadImage("rathausFrog.jpg");
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frog = loadImage(name);
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}
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void draw()
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{
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background(51); // Set background to dark gray
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// Same as image(frog, xoffset, 0), but more efficient
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// because no transformations or tint() or smooth() are used.
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set(xoffset, 0, frog);
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// Draw an X
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line(0, 0, width, height);
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line(0, height, width, 0);
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// // Get the width of the letter
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// float letterWidth = textWidth(letter);
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//
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// Draw the letter to the center of the screen
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text(letter, width/2, height/2);
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}
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void keyPressed()
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{
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// The variable "key" always contains the value of the most recent key pressed.
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// If the key is an upper or lowercase letter between 'A' and 'z'
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// the image is shifted to the corresponding value of that key
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if (key >= 'A' && key <= 'z') {
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// Map the index of the key pressed from the range between 'A' and 'z',
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// into a position for the left edge of the image. The maximum xoffset
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// is the width of the drawing area minus the size of the image.
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xoffset = int(map(key, 'A', 'z', 0, width - frog.width));
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// Update the letter shown to the screen
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letter = key;
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// Write the letter to the console
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println(key);
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}
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}
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