Class: Physics

Physics()

Provides functions for collision detection.

Constructor

new Physics()

Source:

Methods

imagesCollide(img1, x1, y1, frame1opt, img2, x2, y2, frame2opt, alphaThresholdopt) → {boolean}

Checks for pixel-perfect collision between two images, correctly handling translation, scaling, and rotation.
Parameters:
Name Type Attributes Default Description
img1 Jmage The first image object.
x1 number The x-coordinate of the first image's handle.
y1 number The y-coordinate of the first image's handle.
frame1 number <optional>
 1 The frame number for the first image.
img2 Jmage The second image object.
x2 number The x-coordinate of the second image's handle.
y2 number The y-coordinate of the second image's handle.
frame2 number <optional>
 1 The frame number for the second image.
alphaThreshold number <optional>
 128 The alpha value (0-255) above which a pixel is considered solid.
Source:
Returns:
True if any solid pixels overlap, false otherwise.
Type
boolean

imagesOverlap(img1, x1, y1, img2, x2, y2) → {boolean}

Checks if two images, placed at specific coordinates, overlap based on their bounding boxes. This check correctly handles scaled and rotated images by calculating their axis-aligned bounding box.
Parameters:
Name Type Description
img1 Jmage The first image object.
x1 number The x-coordinate of the first image's handle.
y1 number The y-coordinate of the first image's handle.
img2 Jmage The second image object.
x2 number The x-coordinate of the second image's handle.
y2 number The y-coordinate of the second image's handle.
Source:
Returns:
True if the images' bounding boxes overlap, false otherwise.
Type
boolean

rectsOverlap(x1, y1, w1, h1, x2, y2, w2, h2) → {boolean}

Checks if two axis-aligned rectangles overlap.
Parameters:
Name Type Description
x1 number X-coordinate of the first rectangle.
y1 number Y-coordinate of the first rectangle.
w1 number Width of the first rectangle.
h1 number Height of the first rectangle.
x2 number X-coordinate of the second rectangle.
y2 number Y-coordinate of the second rectangle.
w2 number Width of the second rectangle.
h2 number Height of the second rectangle.
Source:
Returns:
True if the rectangles overlap, false otherwise.
Type
boolean