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sago35
226 lines
6.3 KiB
Go
226 lines
6.3 KiB
Go
// Port of Adafruit's "pyportal_boing" demo found here:
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// https://github.com/adafruit/Adafruit_ILI9341/blob/master/examples/pyportal_boing
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package main
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import (
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"time"
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"tinygo.org/x/drivers/examples/ili9341/initdisplay"
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"tinygo.org/x/drivers/examples/ili9341/pyportal_boing/graphics"
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"tinygo.org/x/drivers/ili9341"
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)
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const (
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BGCOLOR = 0xAD75
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GRIDCOLOR = 0xA815
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BGSHADOW = 0x5285
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GRIDSHADOW = 0x600C
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RED = 0xF800
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WHITE = 0xFFFF
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YBOTTOM = 123 // Ball Y coord at bottom
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YBOUNCE = -3.5 // Upward velocity on ball bounce
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_debug = false
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)
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var (
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frameBuffer = [(graphics.BALLHEIGHT + 8) * (graphics.BALLWIDTH + 8) * 2]uint8{}
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startTime int64
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frame int64
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// Ball coordinates are stored floating-point because screen refresh
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// is so quick, whole-pixel movements are just too fast!
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ballx float32
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bally float32
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ballvx float32
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ballvy float32
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ballframe float32
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balloldx float32
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balloldy float32
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// Color table for ball rotation effect
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palette [16]uint16
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)
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var (
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display *ili9341.Device
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)
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func main() {
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display = initdisplay.InitDisplay()
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print("width, height == ")
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width, height := display.Size()
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println(width, height)
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DrawBackground()
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startTime = time.Now().UnixNano()
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frame = 0
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ballx = 20.0
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bally = YBOTTOM // Current ball position
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ballvx = 0.8
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ballvy = YBOUNCE // Ball velocity
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ballframe = 3 // Ball animation frame #
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balloldx = ballx
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balloldy = bally // Prior ball position
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for {
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balloldx = ballx // Save prior position
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balloldy = bally
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ballx += ballvx // Update position
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bally += ballvy
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ballvy += 0.06 // Update Y velocity
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if (ballx <= 15) || (ballx >= graphics.SCREENWIDTH-graphics.BALLWIDTH) {
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ballvx *= -1 // Left/right bounce
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}
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if bally >= YBOTTOM { // Hit ground?
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bally = YBOTTOM // Clip and
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ballvy = YBOUNCE // bounce up
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}
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// Determine screen area to update. This is the bounds of the ball's
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// prior and current positions, so the old ball is fully erased and new
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// ball is fully drawn.
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var minx, miny, maxx, maxy, width, height int16
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// Determine bounds of prior and new positions
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minx = int16(ballx)
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if int16(balloldx) < minx {
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minx = int16(balloldx)
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}
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miny = int16(bally)
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if int16(balloldy) < miny {
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miny = int16(balloldy)
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}
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maxx = int16(ballx + graphics.BALLWIDTH - 1)
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if int16(balloldx+graphics.BALLWIDTH-1) > maxx {
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maxx = int16(balloldx + graphics.BALLWIDTH - 1)
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}
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maxy = int16(bally + graphics.BALLHEIGHT - 1)
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if int16(balloldy+graphics.BALLHEIGHT-1) > maxy {
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maxy = int16(balloldy + graphics.BALLHEIGHT - 1)
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}
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width = maxx - minx + 1
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height = maxy - miny + 1
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// Ball animation frame # is incremented opposite the ball's X velocity
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ballframe -= ballvx * 0.5
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if ballframe < 0 {
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ballframe += 14 // Constrain from 0 to 13
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} else if ballframe >= 14 {
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ballframe -= 14
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}
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// Set 7 palette entries to white, 7 to red, based on frame number.
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// This makes the ball spin
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for i := 0; i < 14; i++ {
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if (int(ballframe)+i)%14 < 7 {
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palette[i+2] = WHITE
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} else {
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palette[i+2] = RED
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} // Palette entries 0 and 1 aren't used (clear and shadow, respectively)
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}
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// Only the changed rectangle is drawn into the 'renderbuf' array...
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var c uint16 //, *destPtr;
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bx := minx - int16(ballx) // X relative to ball bitmap (can be negative)
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by := miny - int16(bally) // Y relative to ball bitmap (can be negative)
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bgx := minx // X relative to background bitmap (>= 0)
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bgy := miny // Y relative to background bitmap (>= 0)
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var bx1, bgx1 int16 // Loop counters and working vars
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var p uint8 // 'packed' value of 2 ball pixels
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var bufIdx int8 = 0
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//tft.setAddrWindow(minx, miny, width, height)
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for y := 0; y < int(height); y++ { // For each row...
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//destPtr = &renderbuf[bufIdx][0];
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bx1 = bx // Need to keep the original bx and bgx values,
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bgx1 = bgx // so copies of them are made here (and changed in loop below)
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for x := 0; x < int(width); x++ {
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var bgidx = int(bgy)*(graphics.SCREENWIDTH/8) + int(bgx1/8)
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if (bx1 >= 0) && (bx1 < graphics.BALLWIDTH) && // Is current pixel row/column
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(by >= 0) && (by < graphics.BALLHEIGHT) { // inside the ball bitmap area?
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// Yes, do ball compositing math...
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p = graphics.Ball[int(by*(graphics.BALLWIDTH/2))+int(bx1/2)] // Get packed value (2 pixels)
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if (bx1 & 1) != 0 {
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c = uint16(p & 0xF)
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} else {
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c = uint16(p >> 4)
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} // Unpack high or low nybble
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if c == 0 { // Outside ball - just draw grid
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if graphics.Background[bgidx]&(0x80>>(bgx1&7)) != 0 {
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c = GRIDCOLOR
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} else {
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c = BGCOLOR
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}
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} else if c > 1 { // In ball area...
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c = palette[c]
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} else { // In shadow area...
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if graphics.Background[bgidx]&(0x80>>(bgx1&7)) != 0 {
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c = GRIDSHADOW
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} else {
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c = BGSHADOW
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}
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}
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} else { // Outside ball bitmap, just draw background bitmap...
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if graphics.Background[bgidx]&(0x80>>(bgx1&7)) != 0 {
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c = GRIDCOLOR
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} else {
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c = BGCOLOR
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}
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}
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frameBuffer[(y*int(width)+x)*2] = byte(c >> 8)
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frameBuffer[(y*int(width)+x)*2+1] = byte(c)
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bx1++ // Increment bitmap position counters (X axis)
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bgx1++
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}
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//tft.dmaWait(); // Wait for prior line to complete
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//tft.writePixels(&renderbuf[bufIdx][0], width, false); // Non-blocking write
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bufIdx = 1 - bufIdx
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by++ // Increment bitmap position counters (Y axis)
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bgy++
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}
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display.DrawRGBBitmap8(minx, miny, frameBuffer[:width*height*2], width, height)
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// Show approximate frame rate
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frame++
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if frame&255 == 0 { // Every 256 frames...
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elapsed := (time.Now().UnixNano() - startTime) / int64(time.Second)
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if elapsed > 0 {
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println(frame/elapsed, " fps")
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}
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}
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}
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}
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func DrawBackground() {
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w, h := display.Size()
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byteWidth := (w + 7) / 8 // Bitmap scanline pad = whole byte
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var b uint8
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for j := int16(0); j < h; j++ {
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for k := int16(0); k < w; k++ {
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if k&7 > 0 {
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b <<= 1
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} else {
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b = graphics.Background[j*byteWidth+k/8]
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}
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if b&0x80 == 0 {
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frameBuffer[2*k] = byte(BGCOLOR >> 8)
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frameBuffer[2*k+1] = byte(BGCOLOR & 0xFF)
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} else {
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frameBuffer[2*k] = byte(GRIDCOLOR >> 8)
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frameBuffer[2*k+1] = byte(GRIDCOLOR & 0xFF)
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}
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}
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display.DrawRGBBitmap8(0, j, frameBuffer[0:w*2], w, 1)
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}
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}
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