1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/12/Screen.jack
/**
* A library of functions for displaying graphics on the screen.
* The Hack physical screen consists of 256 rows (indexed 0..255, top to bottom)
* of 512 pixels each (indexed 0..511, left to right). The top left pixel on
* the screen is indexed (0,0).
*/
class Screen {
/** Initializes the Screen. */
function void init() {
}
/** Erases the entire screen. */
function void clearScreen() {
}
/** Sets the current color, to be used for all subsequent drawXXX commands.
* Black is represented by true, white by false. */
function void setColor(boolean b) {
}
/** Draws the (x,y) pixel, using the current color. */
function void drawPixel(int x, int y) {
}
/** Draws a line from pixel (x1,y1) to pixel (x2,y2), using the current color. */
function void drawLine(int x1, int y1, int x2, int y2) {
}
/** Draws a filled rectangle whose top left corner is (x1, y1)
* and bottom right corner is (x2,y2), using the current color. */
function void drawRectangle(int x1, int y1, int x2, int y2) {
}
/** Draws a filled circle of radius r<=181 around (x,y), using the current color. */
function void drawCircle(int x, int y, int r) {
}
}
|
