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/* | |
* Oscilloscope | |
* Gives a visual rendering of analog pin 0 in realtime. | |
* | |
* This project is part of Accrochages | |
* See http://accrochages.drone.ws | |
* | |
* (c) 2008 Sofian Audry (info@sofianaudry.com) | |
* | |
* This program is free software: you can redistribute it and/or modify | |
* it under the terms of the GNU General Public License as published by | |
* the Free Software Foundation, either version 3 of the License, or | |
* (at your option) any later version. | |
* | |
* This program is distributed in the hope that it will be useful, | |
* but WITHOUT ANY WARRANTY; without even the implied warranty of | |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
* GNU General Public License for more details. | |
* | |
* You should have received a copy of the GNU General Public License | |
* along with this program. If not, see <http://www.gnu.org/licenses/>. | |
*/ | |
import processing.serial.*; | |
Serial port; // Create object from Serial class | |
int val; // Data received from the serial port | |
int[] values; | |
float zoom; | |
float center; | |
float scale = 1; | |
void setup() | |
{ | |
size(1280, 480); | |
// Open the port that the board is connected to and use the same speed (9600 bps) | |
port = new Serial(this, Serial.list()[0], 9600); | |
values = new int[width]; | |
zoom = 1.0f; | |
smooth(); | |
} | |
int getY(int val) { | |
return (int)(height/2 -(val-512+center)*scale / 1023.0f * (height - 1)); | |
} | |
int getValue() { | |
int value = -1; | |
while (port.available() >= 3) { | |
if (port.read() == 0xff) { | |
value = (port.read() << 8) | (port.read()); | |
} | |
} | |
return value; | |
} | |
void pushValue(int value) { | |
for (int i=0; i<width-1; i++) | |
values[i] = values[i+1]; | |
values[width-1] = value; | |
} | |
void drawLines() { | |
stroke(255); | |
int displayWidth = (int) (width / zoom); | |
int k = values.length - displayWidth; | |
int x0 = 0; | |
int y0 = getY(values[k]); | |
for (int i=1; i<displayWidth; i++) { | |
k++; | |
int x1 = (int) (i * (width-1) / (displayWidth-1)); | |
int y1 = getY(values[k]); | |
line(x0, y0, x1, y1); | |
x0 = x1; | |
y0 = y1; | |
} | |
} | |
void drawGrid() { | |
stroke(255, 0, 0); | |
line(0, height/2, width, height/2); | |
} | |
void keyReleased() { | |
println(key+": "+(int)key); | |
switch (key) { | |
case '4': | |
case '*': | |
zoom *= 2.0f; | |
println(zoom); | |
if ( (int) (width / zoom) <= 1 ) | |
zoom /= 2.0f; | |
break; | |
case '6': | |
case '/': | |
zoom /= 2.0f; | |
if (zoom < 1.0f) | |
zoom *= 2.0f; | |
break; | |
case '+': scale*=2; break; | |
case '-': scale /= 2; break; | |
case '8': center += 10/scale; break; | |
case '2': center -= 10/scale; break; | |
case '5': center = 0; scale = 1; break; | |
} | |
} | |
void draw() | |
{ | |
background(0); | |
drawGrid(); | |
val = getValue(); | |
if (val != -1) { | |
pushValue(val); | |
} | |
drawLines(); | |
} |
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pls explain the difference by a picture/image
oscilloscope along with some basic controls is highly appreciated