Subject:
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Re: Java LDraw/LDLite
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Newsgroups:
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lugnet.off-topic.fun
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Date:
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Fri, 26 Feb 1999 19:15:11 GMT
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Viewed:
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2728 times
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I guess I'll be learning Java RSN. Anyone have a preference on what
development tools to use? More important, any pointers to good learning
tools (ie, books)?
Thanks,
Steve
On Thu, 25 Feb 1999 22:13:44 GMT, lehman@javanet.com (Todd Lehman)
wrote:
> In lugnet.cad.dev, blisses@worldnet.att.net (Steve Bliss) writes:
> > How do you draw (pixels) in Java? Are there built-in functions, or
> > would it require platform-specific code, or what? Or graphics library,
> > perhaps?
>
> It's surprisingly easy. Java actually doesn't suck! :)
>
> You just allocate a buffer, designate it as being a graphics buffer, and call
> functions to do graphics primitives. Here's an example -- not probably a
> great example because it's 3 years old and not documented worth a darn -- but
> it was quick to dig up and does give an example of raster blasting at a low
> but completely portable level.
>
> I'm sure the standard libraries have faster code than this for filling
> rectangles, but I needed bilinear-interpolated shaded rectangles, so I had to
> do it by hand.
>
> BTW, one of the BEST things about it is that you can work entirely in 24-bit
> (or 32-bit) color and the built-in graphics subsystem takes care of color
> quantization totally transparently! (no pun intended :)
>
> --Todd
>
> _____________________________________________________________________________
>
> // Basic raw (low-level) image class for Mandelbrot fractal explorer.
> //
> // Todd Lehman, May 28, 1996
>
> import java.awt.*;
> import java.applet.*;
> import java.awt.image.ColorModel;
> import java.awt.image.MemoryImageSource;
>
> public class RawImage
> {
> protected int dx, dy;
> private int pixels[];
> private Image img;
> private MemoryImageSource mis;
> private boolean isdirty;
>
> public RawImage(int dx, int dy)
> {
> this.dx = dx;
> this.dy = dy;
> this.pixels = new int[dx * dy];
> this.mis = new MemoryImageSource(dx, dy, ColorModel.getRGBdefault(),
> pixels, 0, dx);
> this.isdirty = true;
>
> for (int p = dx*dy-1; p >= 0; p--) pixels[p] = 0xFF000000;
> }
>
> public int GetWidth() { return dx; }
> public int GetHeight() { return dy; }
>
> public synchronized Image GetImage()
> {
> if (this.isdirty)
> {
> this.isdirty = false;
> }
>
> return this.img;
> }
>
> public MemoryImageSource GetMemoryImageSource()
> {
> return mis;
> }
>
> public int GetPixelColor(int x, int y)
> {
> if (x < 0) x = 0;
> else if (x >= this.dx) x = this.dx-1;
>
> if (y < 0) y = 0;
> else if (y >= this.dy) y = this.dy-1;
>
> return pixels[(y * this.dx) + x];
> }
>
> public void SolidFillRect(int x0, int y0, int dx, int dy, int color)
> {
> for (int y = y0+dy-1; y >= y0; y--)
> {
> int p = (y * this.dx) + x0 + dx - 1;
>
> for (int x = x0+dx-1; x >= x0; x--)
> {
> pixels[p--] = color;
> }
> }
>
> this.isdirty = true;
> }
>
> public void SmoothFillRect(int x0, int y0, int dx, int dy,
> int c00, int c10, int c01, int c11)
> {
> if ((x0 < 0) || (x0+dx >= this.dx) ||
> (y0 < 0) || (y0+dy >= this.dy))
> {
> return;
> }
>
> int A = 0xFF000000;
> int R = 0x00FF0000;
> int G = 0x0000FF00;
> int B = 0x000000FF;
> int X = 0x00FF0000;
>
> int r00=(c00 & R)<<0, r01=(c01 & R)<<0, r0=r00, r0inc=(r01-r00)/dy;
> int g00=(c00 & G)<<8, g01=(c01 & G)<<8, g0=g00, g0inc=(g01-g00)/dy;
> int b00=(c00 & B)<<16, b01=(c01 & B)<<16, b0=b00, b0inc=(b01-b00)/dy;
>
> int r10=(c10 & R)<<0, r11=(c11 & R)<<0, r1=r10, r1inc=(r11-r10)/dy;
> int g10=(c10 & G)<<8, g11=(c11 & G)<<8, g1=g10, g1inc=(g11-g10)/dy;
> int b10=(c10 & B)<<16, b11=(c11 & B)<<16, b1=b10, b1inc=(b11-b10)/dy;
>
> int p = (y0 * this.dx) + x0;
>
> for (int y = 0; y < dy; y++)
> {
> int r = r0, rinc = (r1 - r0) / dx;
> int g = g0, ginc = (g1 - g0) / dx;
> int b = b0, binc = (b1 - b0) / dx;
>
> for (int x = 0; x < dx; x++)
> {
> pixels[p++] = A |
> ((r & X) >>> 0) |
> ((g & X) >>> 8) |
> ((b & X) >>> 16);
> r += rinc;
> g += ginc;
> b += binc;
> }
>
> r0 += r0inc; r1 += r1inc;
> g0 += g0inc; g1 += g1inc;
> b0 += b0inc; b1 += b1inc;
>
> p += this.dx - dx;
> }
>
> this.isdirty = true;
> }
> }
>
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Message has 1 Reply:
 | | Re: Java LDraw/LDLite
|
| (...) Books: I would recommend Peter van der Linden's "Just Java", and / or (forget the author) "Core Java", as these are excellent tutorials with good code. (1) The O'Reilly book "Java Swing" is a very good introduction to the GUI libraries, but (...) (28 years ago, 26-Feb-99, to lugnet.off-topic.fun)
|
Message is in Reply To:
| | Re: Java LDraw/LDLite
|
| (...) It's surprisingly easy. Java actually doesn't suck! :) You just allocate a buffer, designate it as being a graphics buffer, and call functions to do graphics primitives. Here's an example -- not probably a great example because it's 3 years (...) (28 years ago, 25-Feb-99, to lugnet.cad.dev)
|
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