(1)滑鼠滑過就可以畫了
void setup(){
size(800,600);
}
void draw(){
line(mouseX,mouseY,pmouseX,pmouseY);
}
(2)加入背景顏色以及按滑鼠才可以畫
void setup(){
size(800,600);
background(#FFE203);
}
void draw(){
if(mousePressed)
line(mouseX,mouseY,pmouseX,pmouseY);
}
(3)可以選筆的顏色
void setup(){
size(800,600);
background(#D0A1F2);
stroke(#FF081C);
}
void draw(){
fill(0,255,0);rect(0,0,100,100);
fill(0,0,255);rect(0,100,100,100);
fill(255,255,0);rect(0,200,100,100);
}
void mouseDragged(){
line(mouseX,mouseY,pmouseX,pmouseY);
}
void mousePressed(){
if(mouseX<100 && mouseY<100)
stroke(0,255,0);
else if(mouseX<100 && mouseY<200)
stroke(0,0,255);
else if(mouseX<100 && mouseY<300)
stroke(255,255,0);
}
(4)可以選筆的粗細
void setup(){
size(800,600);
background(255);
stroke(#FF081C);
}
float myTsuTsuDer=1;
color myStroke=color(0);
void draw(){
stroke(0);
strokeWeight(1);
fill(0,255,0);rect(0,0,100,100);
fill(0,0,255);rect(0,100,100,100);
fill(255,255,0);rect(0,200,100,100);
stroke(myStroke);
strokeWeight(myTsuTsuDer);
}
void mouseDragged(){
line(mouseX,mouseY,pmouseX,pmouseY);
}
void mousePressed(){
if(mouseX<100 && mouseY<100)
myStroke=color(0,255,0);
else if(mouseX<100 && mouseY<200)
myStroke=color(0,0,255);
else if(mouseX<100 && mouseY<300)
myStroke=color(255,255,0);
if(mouseX>700)
myTsuTsuDer=mouseY/30;
}
(5)刮畫
PImage imgBG;
PImage imgBlack;
void setup() {
size(800, 600);
imgBG=loadImage("colorBG.jpg");
imgBlack=createImage(800, 600, ARGB);
imgBlack.loadPixels();
for (int i=0; i<imgBlack.pixels.length; i++) {
imgBlack.pixels[i]=color(0, 0, 0, 255);
}
imgBlack.updatePixels();
}
void draw() {
image(imgBG, 0, 0, width, height);
image(imgBlack, 0, 0, width, height);
}
void mouseDragged() {
imgBlack.loadPixels();
imgBlack.pixels[mouseX+mouseY*width]=color(0, 0, 0, 0);
imgBlack.updatePixels();
}
(6)刮畫2
PImage imgBG;
PGraphics pgBlack;
void setup() {
size(800, 600);
imgBG=loadImage("colorBG.jpg");
pgBlack=createGraphics(800, 600);
pgBlack.beginDraw();
pgBlack.strokeWeight(50);
pgBlack.stroke(0, 0, 0, 28);
pgBlack.endDraw();
}
void draw() {
image(imgBG, 0, 0, width, height);
image(pgBlack, 0, 0);
}
void mouseDragged() {
pgBlack.beginDraw();
pgBlack.strokeWeight(50);
pgBlack.stroke(255, 255, 255, 100);
pgBlack.line(mouseX, mouseY, pmouseX, pmouseY);
pgBlack.endDraw();
}
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