Objects collision with same color

[antunovicmatej]

Hi guys,

I really need help.

So I have a circle(on picture) with a 6 colors and I want to make that balls can have collision with that circle ( like red ball with red part on circle) and after collision it removes and increase score by 1 or 2.

Here is my code:

require "ssk.loadSSK" -- -- Set up physics local physics = require "physics" physics.start() physics.setGravity( 0, 0 ) -- -- Forward Declarations -- SSK local angle2Vector = ssk.math2d.angle2Vector local vector2Angle = ssk.math2d.vector2Angle local scaleVec = ssk.math2d.scale local addVec = ssk.math2d.add local subVec = ssk.math2d.sub local normVec = ssk.math2d.normalize local getNormals = ssk.math2d.normals local vecLen = ssk.math2d.length local vecLen2 = ssk.math2d.length2 -- Lua and Corona local mAbs = math.abs local mRand = math.random local getInfo = system.getInfo local getTimer = system.getTimer local strMatch = string.match local strFormat = string.format -- -- A place to store our 'balls' local balls = {} local colors = { \_R\_, \_G\_, \_Y\_, \_C\_ } local colorNames = { "RED", "GREEN", "YELLOW", "CYAN"} local spawnTimer local onCollision local spawnArrow -- -- Target local spinner = display.newImage("circle.png") spinner.x = display.contentWidth/2 spinner.y = display.contentHeight/2 spinner:scale( 0.8, 0.8) local adjustment = 0 local PI = 3.14159265358 local function onTouch(e) if(e.phase == "began") then local dx = e.x - spinner.x local dy = e.y - spinner.y adjustment = math.atan2(dy,dx) \* 180 / PI - spinner.rotation end if(e.phase == "moved") then local dx = e.x - spinner.x local dy = e.y - spinner.y spinner.rotation = (math.atan2(dy,dx) \* 180 / PI) - adjustment end end Runtime:addEventListener('touch', onTouch) -- The balls -- -- Min distance to start away is worst case (i.e. Corner of screen) local vec = subVec( centerX, centerY, left, top, true) local minLen = vecLen( vec ) onCollision = function( self, event ) if( event.phase == "began" ) then balls[self] = nil print("My approach angle: ", self.approachAngle, " color: ", colorNames[self.myColor]) display.remove( self) end return true end spawnArrow = function() local size = 20 local speed = 200 local approachAngle = math.random(0,360) local startOffset = angle2Vector( approachAngle, true ) local velocityVec = table.shallowCopy( startOffset ) startOffset = scaleVec( startOffset, minLen ) velocityVec = scaleVec( velocityVec, -speed ) local tmp = display.newCircle( startOffset.x + centerX, startOffset.y + centerY, size/2 ) physics.addBody( tmp, "dynamic", { radius = size/2 } ) tmp.isSensor = true tmp.approachAngle = approachAngle tmp.myColor = math.random(1,#colors) tmp:setFillColor( unpack(colors[tmp.myColor]) ) tmp.collision = onCollision tmp:addEventListener( "collision" ) local function hitTestObjects(tmp, spinner) local left = tmp.contentBounds.xMin \<= spinner.contentBounds.xMin and tmp.contentBounds.xMax \>= spinner.contentBounds.xMin local right = tmp.contentBounds.xMin \>= spinner.contentBounds.xMin and tmp.contentBounds.xMin \<= spinner.contentBounds.xMax local up = tmp.contentBounds.yMin \<= spinner.contentBounds.yMin and tmp.contentBounds.yMax \>= spinner.contentBounds.yMin local down = tmp.contentBounds.yMin \>= spinner.contentBounds.yMin and tmp.contentBounds.yMin \<= spinner.contentBounds.yMax return (left or right) and (up or down) end local doTest = true local function test(event) --Check if the objects are colliding and are the same color if doTest == true then if hitTestObjects(tmp, spinner) == true then if tmp.color == spinner.color then print("collided with same color object") --Remove the images display.remove(tmp) doTest = false end else spinner:translate(0, 0) end end return true end Runtime:addEventListener("enterFrame", test) tmp:setLinearVelocity( velocityVec.x, velocityVec.y ) balls[tmp] = tmp timer.performWithDelay( 3000, spawnArrow ) end spawnArrow()

I have that collision ( balls with circle ) but in corona simulator output it just says collided with same color object and on Corona simulator balls are coming across the screen with random colors from code but I want to make that when e.g. yellow ball hits red part on circle it just opens restart screen.

Sorry if you don’t understand,I am from Croatia

[hasty]

When your balls collide with the spinner, you can calculate the angle. If it is 0 to 60 degrees, you’ve hit the green, if it’s between 60 and 120, it’s hit the light blue, etc.

[antunovicmatej]

Thanks for that,but can you write that for code above? Please

[hasty]

You can use ball.x minus spinner.x and ball.y minus spinner.y to get the vector components, and use vector2Angle to get the angle.

You could pass this angle into a function to see what colour of the spinner it’s collided with. A function like this:

local function angleToColour(angle) &nbsp;&nbsp; &nbsp;-- function assumes degrees, not radians &nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; local rot = spinner.rotation &nbsp;&nbsp;&nbsp; angle = angle - rot &nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;-- ensure a positive angle &nbsp;&nbsp; &nbsp;while angle \< 0 do &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;angle = angle + 360 &nbsp;&nbsp; &nbsp;end &nbsp;&nbsp;&nbsp; if angle \>= 0 and angle \< 60 then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "green" &nbsp;&nbsp;&nbsp; elseif angle \>= 60 and angle \< 120 then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "cyan" &nbsp;&nbsp;&nbsp; -- etc &nbsp;&nbsp;&nbsp; end end

You can get the angle and call the function inside your ball’s collision handler ( where the ball’s coordinates are accessed by self.x and self.y).

Then you can use a conditional to check whether the colour hit is the same as the ball’s colour.

Oh, and don’t forget to make your spinner a physics object, or you won’t detect the collision.

Also, if you do it this way, you don’t need the test stuff you have near the bottom (which is broken anyway).

[antunovicmatej]

Thanks.

I typed that code inside ball’s collision and it’s the same thing like before.

Sorry,but I am new at Corona and in lua i just know physics and that’s all.

[hasty]

A small sample project to illustrate:

local physics = require "physics" physics.start() physics.setGravity(0, 0) local ball = display.newCircle(10, 10, 5) physics.addBody(ball, "dynamic") ball:setLinearVelocity(50, 50) local spinner = display.newImage("circle.png") spinner.x = display.contentWidth/2 spinner.y = display.contentHeight/2 spinner.rotation = math.random(1, 359) physics.addBody(spinner, "static", {isSensor = true, radius = spinner.width \* 0.46}) ball:toFront() local hitText = display.newText("no collision yet", 180, 30) -- draw lines to illustrate true divisions local myLines = {} local angle = 60 local rot = spinner.rotation for i = 1, 6, 1 do myLines[i] = display.newLine(spinner.x, spinner.y, spinner.x + 100 \* math.cos((angle + rot)\*3.14/180), spinner.y + 100 \* math.sin((angle + rot)\*3.14/180)) myLines[i]:setStrokeColor(0) angle = angle + 60 end local function angleToColour(angle) -- function assumes degrees, not radians local rot = spinner.rotation angle = angle - rot -- ensure a positive angle while angle \< 0 do angle = angle + 360 end if angle \>= 0 and angle \< 60 then return "green" elseif angle \>= 60 and angle \< 120 then return "cyan" elseif angle \>= 120 and angle \< 180 then return "blue" elseif angle \>= 180 and angle \< 240 then return "pink" elseif angle \>= 240 and angle \< 300 then return "red" elseif angle \>= 300 and angle \< 360 then return "yellow" end end onCollision = function( self, event ) if( event.phase == "began" ) then hitText.text = angleToColour(math.atan2(self.y - spinner.y, self.x - spinner.x)\* 180 / 3.14159265) end return true end ball.collision = onCollision ball:addEventListener("collision", ball)

[antunovicmatej]

Thank you!

It works,but now I want to make when red ball hits green part that it goes on restart screen.

How can I type that?

[hasty]

You should familiarise yourself with composer:

https://coronalabs.com/blog/2014/01/21/introducing-the-composer-api-plus-tutorial/

[hasty]

When your balls collide with the spinner, you can calculate the angle. If it is 0 to 60 degrees, you’ve hit the green, if it’s between 60 and 120, it’s hit the light blue, etc.

[antunovicmatej]

Thanks for that,but can you write that for code above? Please

[hasty]

You can use ball.x minus spinner.x and ball.y minus spinner.y to get the vector components, and use vector2Angle to get the angle.

You could pass this angle into a function to see what colour of the spinner it’s collided with. A function like this:

local function angleToColour(angle) &nbsp;&nbsp; &nbsp;-- function assumes degrees, not radians &nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; local rot = spinner.rotation &nbsp;&nbsp;&nbsp; angle = angle - rot &nbsp;&nbsp; &nbsp; &nbsp;&nbsp; &nbsp;-- ensure a positive angle &nbsp;&nbsp; &nbsp;while angle \< 0 do &nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;angle = angle + 360 &nbsp;&nbsp; &nbsp;end &nbsp;&nbsp;&nbsp; if angle \>= 0 and angle \< 60 then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "green" &nbsp;&nbsp;&nbsp; elseif angle \>= 60 and angle \< 120 then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return "cyan" &nbsp;&nbsp;&nbsp; -- etc &nbsp;&nbsp;&nbsp; end end

You can get the angle and call the function inside your ball’s collision handler ( where the ball’s coordinates are accessed by self.x and self.y).

Then you can use a conditional to check whether the colour hit is the same as the ball’s colour.

Oh, and don’t forget to make your spinner a physics object, or you won’t detect the collision.

Also, if you do it this way, you don’t need the test stuff you have near the bottom (which is broken anyway).

[antunovicmatej]

Thanks.

I typed that code inside ball’s collision and it’s the same thing like before.

Sorry,but I am new at Corona and in lua i just know physics and that’s all.

[hasty]

A small sample project to illustrate:

local physics = require "physics" physics.start() physics.setGravity(0, 0) local ball = display.newCircle(10, 10, 5) physics.addBody(ball, "dynamic") ball:setLinearVelocity(50, 50) local spinner = display.newImage("circle.png") spinner.x = display.contentWidth/2 spinner.y = display.contentHeight/2 spinner.rotation = math.random(1, 359) physics.addBody(spinner, "static", {isSensor = true, radius = spinner.width \* 0.46}) ball:toFront() local hitText = display.newText("no collision yet", 180, 30) -- draw lines to illustrate true divisions local myLines = {} local angle = 60 local rot = spinner.rotation for i = 1, 6, 1 do myLines[i] = display.newLine(spinner.x, spinner.y, spinner.x + 100 \* math.cos((angle + rot)\*3.14/180), spinner.y + 100 \* math.sin((angle + rot)\*3.14/180)) myLines[i]:setStrokeColor(0) angle = angle + 60 end local function angleToColour(angle) -- function assumes degrees, not radians local rot = spinner.rotation angle = angle - rot -- ensure a positive angle while angle \< 0 do angle = angle + 360 end if angle \>= 0 and angle \< 60 then return "green" elseif angle \>= 60 and angle \< 120 then return "cyan" elseif angle \>= 120 and angle \< 180 then return "blue" elseif angle \>= 180 and angle \< 240 then return "pink" elseif angle \>= 240 and angle \< 300 then return "red" elseif angle \>= 300 and angle \< 360 then return "yellow" end end onCollision = function( self, event ) if( event.phase == "began" ) then hitText.text = angleToColour(math.atan2(self.y - spinner.y, self.x - spinner.x)\* 180 / 3.14159265) end return true end ball.collision = onCollision ball:addEventListener("collision", ball)

[antunovicmatej]

Thank you!

It works,but now I want to make when red ball hits green part that it goes on restart screen.

How can I type that?

[hasty]

You should familiarise yourself with composer:

https://coronalabs.com/blog/2014/01/21/introducing-the-composer-api-plus-tutorial/