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processing - 处理中的像素橡皮擦

问题描述

我是使用 Processing 的新手，这次我尝试像绘画程序一样。由于我选择在背景中绘制网格，我不知道如何制作橡皮擦。如果有人有任何想法......

这是我的代码：


int x = 20, y = 40, w = 70, h = 50;

void setup() {
  size(600, 600);
  background(255);

  stroke(240);
  for (int linex = 0; linex < width; linex = linex+40) {
    for (int liney = 0; liney < height; liney = liney + 40) {
      line(0, liney, width, liney);
    }
    line(linex, 0, linex, height);
  }

  fill(255, 0, 0);
  rect(x, height - 250, w, h);

  fill(0, 255, 0);
  rect(x, height - 190, w, h);

  fill(0, 0, 255);
  rect(x, height - 130, w, h);

  fill(0);
  rect(x, y, w, h);
  textSize(17);
  text("Erase everything", 10, 30);
}

void draw() {
  if ((keyPressed && key == 'r') || (mousePressed && mouseX > x && mouseX < x + w && mouseY > (height - 250) && mouseY < (height - 250) + h)) {
    fill(255, 0, 0);
  }
  if (keyPressed && key == 'g'|| (mousePressed && mouseX > x && mouseX < x + w && mouseY > (height - 190) && mouseY < (height - 190) + h)) {
    fill(0, 255, 0);
  }
  if (keyPressed && key == 'b' || (mousePressed && mouseX > x && mouseX < x + w && mouseY > (height - 130) && mouseY < (height - 130) + h))  {
    fill(0, 0, 255);
  }
  if (keyPressed && key == 'n'){
    fill(0);
  }

  if (mousePressed) {
    noStroke();
    ellipse(mouseX, mouseY, 20, 20);
  }

  if (mouseX > x && mouseX < x + w && mouseY > y && mouseY < y+h && mousePressed) {
    setup();
  }
}

提前致谢

标签： processing

解决方案

只需将以下代码潜入程序中的 draw() 函数中即可。

noStroke();

ellipse(mouseX, mouseY, 8, 8); // change width and height to the diameter (in pixels) you want your eraser to have.

strokeWeight(1);

或者，如果你想要一个正方形而不是圆形：

noStroke();
rectMode(CENTER);

rect(mouseX, mouseY, 8, 8);

rectMode(CORNER);
strokeWeight(1);

或甜菜之间的东西：

noStroke();
rectMode(CENTER);

rect(mouseX, mouseY, 8, 8, 4); // the 5th parameter is the edge smoothness (in pixels)

rectMode(CORNER);
strokeWeight(1);

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