alanhc 互動技術-week3
alanhc 互動技術-week3
September 26, 2019
筆記
background() 比image()快10倍一筆成形
void draw() {
line(mouseX, mouseY, pmouseX, pmouseY);
}
按下左鍵才畫圖
if (mousePressed == true && mouseButton == LEFT)
void setup() {
size(600, 400);
}
void draw() {
if (mousePressed == true && mouseButton == LEFT) line(mouseX, mouseY, pmouseX, pmouseY);
}
畫粗細及輕重
調粗細 strokeWeight(lw);
調顏色 stroke(colorV);
1. 按下方向鍵處理 keyPressed()
2. 變數調整 colorV += 20;、lw-=1;
int colorV=0;
int lw=1;
void draw() {
if (mousePressed == true && mouseButton == LEFT) {
ellipse(mouseX, mouseY, 3, 3);
line(mouseX, mouseY, pmouseX, pmouseY);
stroke(colorV);
strokeWeight(lw);
}
}
void keyPressed() {
if (keyCode == UP) {
colorV += 20;
} else if (keyCode == DOWN) {
colorV -= 20;
}
if (keyCode == LEFT) {
lw-=1;
} else if (keyCode == RIGHT) {
lw+=1;
}
if (colorV<0) colorV=0;
if (lw<1) lw=1;
}
小畫家
座標系統
void setup() {
size(600, 400);
fill(255,0,0); rect(0,0,50,50);
fill(0,255,0); rect(0,50,50,50);
fill(0,0,255); rect(0,100,50,50);
fill(255,0,255); rect(0,150,50,50);
fill(0,255,255); rect(0,200,50,50);
line(50,0,50,400);
line(25,250,25-7,400);
line(25,250,25+7,400);
}
void draw() {
if (mousePressed && mouseX<50) {
if (mouseY<50) stroke(255,0,0);
else if (mouseY<100) stroke(0,255,0);
else if (mouseY<150) stroke(0,0,255);
else if (mouseY<200) stroke(255,0,255);
else if (mouseY<250) stroke(0,255,255);
else {
strokeWeight( (mouseY-250)/10 );
}
}
if (mousePressed && mouseX>50) {
line(pmouseX, pmouseY, mouseX, mouseY);
}
}
特殊鍵用keyCode，一般用key
按下滑鼠瞬間
void mousePressed()
按下滑鼠拖曳void mouseDragged()
畫線用 mouseDragged()
選顏色用 mousePressed()
