3 G2D.RotoZoom

boxgaming edited this page 2023-05-12 11:50:59 -05:00

Table of Contents

• Syntax
• Parameters
• Examples

Rotates and zooms an image.

Syntax

G2D.Rotate centerX&, centerY&, img&, [xScale%], [yScale%], [rotation%]

Parameters

• The centerX& and centerY& parameters indicate the location at which the center of the image will be rendered.
• The img& parameter is the id of the image to display.
• The optional xScale% parameter defines the horizontal scale applied to the image. If not specified, this will default to 1.0.
• The optional yScale% parameter defines the horizontal scale applied to the image. If not specified, this will default to 1.0.
• The optional rotation% parameter defines the rotation (in degrees) applied to the image. If not specified, this will default to 0.

Examples

Example1: Load an image and continuously rotate while alternating between zooming in and zooming out.

Import G2D From "lib/graphics/2d.bas"

Dim testImg As Long
testImage = _LoadImage("https://raw.githubusercontent.com/boxgaming/qbjs/main/logo.png")

Dim rot, zoom, zf
zf = .05
Do
    Cls
    G2D.RotoZoom 320, 200, testImage, zoom, zoom, rot
    _Limit 60
    rot = rot + 2
    zoom = zoom + zf
    If zoom >=8 Then zf = -.05
    If zoom <=.5 Then zf = .05
    If rot >= 360 Then rot = 0
Loop

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Samples