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50 lines
1.1 KiB
Plaintext
50 lines
1.1 KiB
Plaintext
/**
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* Moving On Curves.
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*
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* In this example, the circles moves along the curve y = x^4.
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* Click the mouse to have it move to a new position.
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*/
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float beginX = 20.0; // Initial x-coordinate
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float beginY = 10.0; // Initial y-coordinate
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float endX = 570.0; // Final x-coordinate
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float endY = 320.0; // Final y-coordinate
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float distX; // X-axis distance to move
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float distY; // Y-axis distance to move
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float exponent = 4; // Determines the curve
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float x = 0.0; // Current x-coordinate
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float y = 0.0; // Current y-coordinate
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float step = 0.01; // Size of each step along the path
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float pct = 0.0; // Percentage traveled (0.0 to 1.0)
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void setup()
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{
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size(640, 360);
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noStroke();
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distX = endX - beginX;
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distY = endY - beginY;
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}
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void draw()
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{
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fill(0, 2);
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rect(0, 0, width, height);
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pct += step;
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if (pct < 1.0) {
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x = beginX + (pct * distX);
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y = beginY + (pow(pct, exponent) * distY);
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}
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fill(255);
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ellipse(x, y, 20, 20);
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}
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void mousePressed() {
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pct = 0.0;
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beginX = x;
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beginY = y;
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endX = mouseX;
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endY = mouseY;
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distX = endX - beginX;
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distY = endY - beginY;
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}
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