RotoZoom3 (Modification) by bplus

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Junior Librarian:
Author and contributor: @bplus @Galleon
Source: QB64.org Wiki and Forum
URL: https://www.qb64.org/wiki/MAPTRIANGLE
https://www.qb64.org/forum/index.php?topic=1511.msg115148#msg115148
Version: 2020 version #3
Tags: [graphics] [image]
Description:
A modification of Galleon's RotoZoom in Wiki that both scales and rotates an image, this version scales the x-axis and y-axis independently allowing some rotations of image just by changing X or Y Scales making this already powerful routine even more a versatile image tool.

Source Code (and demos with Spike Image (attached)):

--- Code: QB64: ---OPTION _EXPLICIT_TITLE "Another RotoZoom Demo" 'b+ started 2020-03-02 CONST xmax = 1200, ymax = 700, xc = 600, yc = 350SCREEN _NEWIMAGE(xmax, ymax, 32)_SCREENMOVE 100, 40DIM SHARED s&, aoDIM a, x, y, x1, y1, xs, dxs, ddxs, ys, dys, ddys, maxScale ' Starting from an image I pulled from Internet, I used Paint 3D to give it a transparent background.s& = _LOADIMAGE("tspike.png") 't for transparent background ' Standard Rotation about the image center on a given X, Y location. Rotating image in middle of screen,' I used something like this to find ideal angle for level point on left head on right.WHILE _KEYDOWN(27) = 0 a = a + _PI(1 / 36) IF a > _PI(1.999) THEN a = 0 CLS RotoZoom3 xc, yc, s&, 1, 1, a PRINT "Raw image rotation:": PRINT PRINT "radian angle:"; a; " degrees:"; _R2D(a) \ 1; " press key for next angle... esc to rotate on y axis" WHILE LEN(INKEY$) = 0: _LIMIT 60: WENDWEND ao = _PI(.27) ' I have to offset the image angle by this amount so that the spike point is on the left' and the head is on the right at 0 degrees or radians. 'Demo of the independent x and y scale for axis rotationsmaxScale = 4: dxs = .01: ddxs = 1: xs = maxScale:WHILE LEN(INKEY$) = 0 CLS PRINT "Press any for rotation on x axis..." RotoZoom3 xc, yc, s&, xs, maxScale, ao IF xs + dxs > maxScale OR xs + dxs < -maxScale THEN ddxs = ddxs * -1 xs = xs + dxs * ddxs _DISPLAY _LIMIT 60WEND ys = maxScale: dys = .01: ddys = 1WHILE LEN(INKEY$) = 0 CLS PRINT "Press any to see layout of image over whole screen and end demo..." RotoZoom3 xc, yc, s&, maxScale, ys, ao IF ys + dys > maxScale OR ys + dys < -maxScale THEN ddys = ddys * -1 ys = ys + dys * ddys _DISPLAY _LIMIT 60WEND ' Demo of an applied layout on screenCOLOR , &HFFBBBBBB: CLS ' the image has slight gray halo so hide with gray backgroundFOR x = 40 TO _WIDTH - 40 STEP 20 RotoZoom3 x, 15, s&, .2, .2, _PI(1.5 + .27) RotoZoom3 x, _HEIGHT - 15, s&, .2, .2, _PI(.5 + .27)NEXTFOR y = 40 TO _HEIGHT - 40 STEP 20 RotoZoom3 15, y, s&, .2, .2, _PI(1 + .27) RotoZoom3 _WIDTH - 15, y, s&, .2, .2, _PI(.27)NEXTFOR a = 0 TO _PI(2) STEP _PI(1 / 6) x1 = xc + 200 * COS(a) y1 = yc + 200 * SIN(a) RotoZoom3 x1, y1, s&, 2, 2, a + aoNEXT_DISPLAY_DELAY 4 'And finally a little show. What is better than a knife thrower throwing bananas?WHILE _KEYDOWN(27) = 0 CLS drawKite xc, .9 * ymax, 600, a + ao _DISPLAY _LIMIT 30 a = a + _PI(2 / 360)WENDSYSTEM SUB drawKite (x, y, s, a) RotoZoom3 x, y, s&, s / _WIDTH(s&), s / _HEIGHT(s&), a + ao IF s > 10 THEN drawKite x + .5 * s * COS(_PI(2) - a), (y - .25 * s) + .25 * s * SIN(_PI(2) - a), s / 1.5, a drawKite x + .5 * s * COS(_PI + a), (y - .25 * s) + .25 * s * SIN(_PI + a), s / 1.5, a END IFEND SUB ' Description:' Started from a mod of Galleon's in Wiki that both scales and rotates an image.' This version scales the x-axis and y-axis independently allowing rotations of image just by changing X or Y Scales' making this tightly coded routine a very powerful and versatile image tool.SUB RotoZoom3 (X AS LONG, Y AS LONG, Image AS LONG, xScale AS SINGLE, yScale AS SINGLE, radianRotation AS SINGLE) ' This assumes you have set your drawing location with _DEST or default to screen. ' X, Y - is where you want to put the middle of the image ' Image - is the handle assigned with _LOADIMAGE ' xScale, yScale - are shrinkage < 1 or magnification > 1 on the given axis, 1 just uses image size. ' These are multipliers so .5 will create image .5 size on given axis and 2 for twice image size. ' radianRotation is the Angle in Radian units to rotate the image ' note: Radian units for rotation because it matches angle units of other Basic Trig functions ' and saves a little time converting from degree. ' Use the _D2R() function if you prefer to work in degree units for angles. DIM px(3) AS SINGLE: DIM py(3) AS SINGLE ' simple arrays for x, y to hold the 4 corners of image DIM W&, H&, sinr!, cosr!, i&, x2&, y2& ' variables for image manipulation W& = _WIDTH(Image&): H& = _HEIGHT(Image&) px(0) = -W& / 2: py(0) = -H& / 2 'left top corner px(1) = -W& / 2: py(1) = H& / 2 ' left bottom corner px(2) = W& / 2: py(2) = H& / 2 ' right bottom px(3) = W& / 2: py(3) = -H& / 2 ' right top sinr! = SIN(-radianRotation): cosr! = COS(-radianRotation) ' rotation helpers FOR i& = 0 TO 3 ' calc new point locations with rotation and zoom x2& = xScale * (px(i&) * cosr! + sinr! * py(i&)) + X: y2& = yScale * (py(i&) * cosr! - px(i&) * sinr!) + Y px(i&) = x2&: py(i&) = y2& NEXT _MAPTRIANGLE _SEAMLESS(0, 0)-(0, H& - 1)-(W& - 1, H& - 1), Image TO(px(0), py(0))-(px(1), py(1))-(px(2), py(2)) _MAPTRIANGLE _SEAMLESS(0, 0)-(W& - 1, 0)-(W& - 1, H& - 1), Image TO(px(0), py(0))-(px(3), py(3))-(px(2), py(2))END SUB
Attachments:
Another RotoZoom Demo.zip
(124 downloads previously)

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