作为词云渲染算法的一部分(受此问题的启发),我创建了一个 Javascript / Processing.js 函数,该函数沿不断增加的螺旋线移动单词的矩形,直到不再与先前放置的单词发生冲突。它有效,但我对代码质量感到不舒服。
所以我的问题是:我怎样才能将这段代码重组为:
- 可读+易懂
- 快(不做无用的计算)
- 优雅(使用几行代码)
我也很感激任何关于进行大量计算编程的最佳实践的提示。
Rectangle moveWordRect(wordRect){
// Perform a spiral movement from center
// using the archimedean spiral and polar coordinates
// equation: r = a + b * phi
// Calculate mid of rect
var midX = wordRect.x1 + (wordRect.x2 - wordRect.x1)/2.0;
var midY = wordRect.y1 + (wordRect.y2 - wordRect.y1)/2.0;
// Calculate radius from center
var r = sqrt(sq(midX - width/2.0) + sq(midY - height/2.0));
// Set a fixed spiral width: Distance between successive turns
var b = 15;
// Determine current angle on spiral
var phi = r / b * 2.0 * PI;
// Increase that angle and calculate new radius
phi += 0.2;
r = (b * phi) / (2.0 * PI);
// Convert back to cartesian coordinates
var newMidX = r * cos(phi);
var newMidY = r * sin(phi);
// Shift back respective to mid
newMidX += width/2;
newMidY += height/2;
// Calculate movement
var moveX = newMidX - midX;
var moveY = newMidY - midY;
// Apply movement
wordRect.x1 += moveX;
wordRect.x2 += moveX;
wordRect.y1 += moveY;
wordRect.y2 += moveY;
return wordRect;
}